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{{Short description|Historical process by which the shallow, natural River Thames was turned into a tidal canal}}
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[[File:Isle of Dogs in the 18th century.png|thumb|upright=1.5|'''Cattle grazing below high water, [[Isle of Dogs]], 1792''' ([[Robert Dodd (artist)|Robert Dodd]], detail: National Maritime Museum)]]
The '''Embanking of the tidal Thames''' is the historical process by which the lower [[River Thames]], at one time a broad, shallow waterway winding through [[malaria|malarious]] [[marshlands]], has been transformed into a deep [[tide|tidal]] [[canal]].  With small beginnings in Roman [[Londinium]], it was pursued more vigorously in the Middle Ages. Walls and [[levee|embankment]]s were built, marsh was drained and urban [[wikt:frontager|frontagers]] [[wikt:encroach|encroached]] into the navigable [[stream]]. Today, over 200 miles of walls line its banks from [[Teddington]] down to its mouth in the [[North Sea]]; they defend a tidal [[flood plain]] where 1.25 million people work and live.  The Victorian civil engineering works in central London, usually called [[Thames Embankment|"the Embankment"]], are just a small part of the process.

For a long time, who created the walls was a mystery.  To embank a [[Tidal range#Classification|macro-tidal]] river seemed to call for a major civil engineering programme, yet none was mentioned in the historical record. For lack of a better theory, the works were attributed to "the Romans".  The geologist and archaeologist [[Flaxman Charles John Spurrell|Flaxman Spurrell]] was the first scientist to supply the currently accepted explanation.  He realised that the land has been subsiding relative to the sea — hence, the [[head of tide|tidal limit]] of the Thames has been moving upstream — but slowly enough for frontagers to adapt.  Thus, the embanking of the Thames started at a time when the river was not tidal, or not strongly so.  Only low embankments were needed at first; they were raised gradually as the land continued to sink and the waters to rise.  The process was carried out piecemeal and incrementally, sometimes furtively; most often by local people who wanted to reclaim marshland, defend farmland already won or, in London, to get a few more inches of valuable waterfront property.  In general, the Thames is narrower than it used to be.

Although the walls were created to win land from water, doing it had an unforeseen consequence, a "much more important thing to the country at large": the formation of a deeper Thames navigable by larger ships that could travel further inland, in which grew the largest port in the world.

The process was not a smooth one.  If a wall was poorly maintained the river might break through, drowning the adjoining lands, sometimes for years at a time. Mishaps of that sort happened quite often.  Legal disputes provide the first historical records of the embankment process and show it started before 1200.  A special branch of the [[common law]], ''marsh law'', evolved to deal with such disputes.

It has been argued that land reclamation in the Thames contributed to the rise of independent farmers and the decay of the [[feudal system]].  Other political consequences were said to be two clauses in [[Magna Carta]], and one of the declared causes of the [[English Civil War]].

Much of present-day London is recovered marshland and considerable parts lie below high water mark.  Some London streets originated as tracks running along the wall and yet today, are not even in sight of the river.

==The Thames before the walls vs. the river today==
===In the Roman era===
The natural Thames near Roman Londinium was a river flowing through marshland, at some point infested with malarial mosquitos (next section).  The original site of London may have been chosen because it was the first place<ref>Going up the river.</ref>   where a broad tract of dry land — chiefly gravel — came down to the stream; the modern [[City of London]] (i.e. the "Square Mile") is built on that gravel.{{sfn|Whitaker|1889|p=455}}{{sfn|Llewellyn Smith|1939|p=199}}  Below, the river flowed to the sea through broad marshes, touching firm ground at just a few points.  (It was still so even in the Victorian era, though by then the river was restrained at high tides by earthen banks.){{sfn|Whitaker|1889|p=454}}{{sfn|Rammell|1854|pp=379-80}}  According to James A. Galloway{{quote|
The salt marsh and reed-bed plants which colonised these soils, and the creeks which bisected the marshes, were exploited by human beings for millennia before the marshes were embanked and cut off from tidal influence — for grazing, fishing and fowling and the cutting of reeds and rushes for thatch and flooring — while mudflats around the outer estuary were home to a seasonal salt-making industry.{{sfn|Galloway|2013|p=3 (author's preprint)}} }}

Thus much of today's urban London is built on reclaimed marshland.{{sfn|Bosworth|1912|p=9}}

<gallery mode="packed" heights="250px">
File:Ancient London and marshes.jpg|'''Around Londinium''' (modern placenames)
File:Hadrian bm.jpg|thumb|'''Roman bronze''' found in Thames
File:1796 Thames marshes.jpg|'''Thames marshland''', London to the North Sea, here shown in a late 18th-century map</gallery>

[[Hilda Ormsby]] — one of the first to write a modern geographical textbook on London — visualised the scene:{{quote|In our mental picture of "London before the Houses", we must conceive of the Flood Plain as a flat extent of [[peat]]y, water-logged land, raised a foot or two above high water, covered with a coarse, rank herbage and intersected by innumerable little winding creeks, filled with water only at high tide...}}

{{quote|... the river must have been both wider and shallower before embanking took place. Even Elizabethan maps show the river, at Westminster particularly, considerably wider than it is now}} where, probably, it was shallow enough to be forded.{{sfn|Ormsby|1922|pp=251, 252-3}}

Some of those creeks may have been navigable.  Of only three Roman ships found in London, one was dug up on the site of [[Guy's Hospital]].{{sfn|Marsden|1994|pp=97-104, 109-128}}

Victorian historians had a theory that the Roman-era Thames practically had no banks, but instead spread out into a vast lagoon at high tide.  They used it to argue for the [[etymology]] "London" ← ''Llyndin'' (= "lake fort").  This is now discounted.{{sfn|Ormsby|1922|p=251}}{{sfn|Home|1926|pp=19-22}}{{sfn|Spurrell|1885|pp=301-2}}  Further, the central bed of the Thames was in much the same position as it is today.  "Notwithstanding that the waterway of the Thames is very irregular, it is clear that it has kept its present line of flow the same, within narrow limits, since it first became estuarine".{{sfn|Spurrell|1889|p=212}}

More recent research suggests that in Londinium the tide was not large, and at one time non-existent.  (See below, ''The advancing head of tide'').

During the Roman occupation the first embankation took place: building a quayside in the London Bridge area (see City of London, below).

===Malaria===
[[File:Male mosquito, Anopheles maculipennis (atroparvus), 1901 Wellcome L0037510.jpg|thumb|upright=0.70|'''''A. atroparvus''''', [[Vector (epidemiology)|vector]]<ref>The illustration shows the male mosquito; the parasite is transmitted by the bite of the female.</ref> of malaria in the Thames (Wellcome)]]
[[File:Marianne North opium poppy.jpg|thumb|upright=0.70|'''Opium poppies''' were cultivated in the marshes ([[Marianne North]] Gallery)]]

Malaria was commonplace in the Thames<ref>And other marshes in Kent and East Anglia.</ref> marshes, including London, and was called "[[Ague (disambiguation)|ague]]"<!---Please do not disambiguate.  The ambiguity is deliberate, reflecting contemporary medical thought.---> or "marsh fever".  While not all agues were caused by malaria, most{{sfn|Bankoff|2018|p=477}} scholars believe true malaria — the [[protozoan infection]] — was indeed present. It was mainly transmitted by the mosquito ''[[Anopheles]] atroparvus'',{{sfn|Dobson|1980|pp=383-4, 386, 376-7}} and was frequently lethal.<ref>If not by killing victims at once, then by producing a chronic state of ill health leading to early death: {{harvnb|Dobson|1980|p=375}}.</ref>

Possibly malaria was introduced by the Roman invaders;{{sfn|Bankoff|2018|p=476}} evidence from skeletons suggests the disease was present in Anglo-Saxon England.{{sfn|Gowland|Western|2012|pp=301, 307, 309|ps=.  "Malaria does not result in unequivocal pathological lesions in the human skeleton; however, it results in hemolytic anemia, which can contribute to the skeletal condition cribra orbitalia".  Gowland and Western found a correlation between cribra orbitalia and marsh-district cemeteries of Anglo-Saxon England.}}

It was anyway rife by the 16th century,{{sfn|Dobson|1980|p=382}}{{sfn|Bankoff|2018|p=477}} though the climate (the "[[Little Ice Age]]") was colder than today.{{sfn|Reiter|2000|p=1}} [[James I]] and [[Oliver Cromwell]] were thought to have died of it, and it was prevalent in London before and after the [[Great Fire of London|Great Fire]].{{sfn|Bankoff|2018|p=479}}  Mary Dobson said that {{quote|in the low-lying parishes bordering the River Thames and the River Medway ... burial rates were three or four times as high as those of the healthiest downland communities".{{sfn|Dobson|1980|p=257}} }}
Writing about 1800, [[Edward Hasted]] noted{{quote|it is not unusual to see a poor man, his wife, and whole family of five or six children, hovering over their fire in their hovel, shaking with an ague all at the same time".{{sfn|Dobson|1980|p=366}} }}The heavy use of [[opium]] (often consumed as poppy-head tea){{sfn|Bankoff|2018|p=487}} and alcohol to fight the fever was commonplace.{{sfn|Dobson|1980|p=370}}  Later, the disease was combated with [[quinine]]; that this treatment was effective tends to confirm it was malaria, and not some unrelated malady.{{sfn|Dobson| 1980|pp=374, 384}}  (Another sign was "ague cake": an enlarged [[spleen]].){{sfn|Dobson|1980|pp=373-4}}

At [[Guy's Hospital]] they frequently received ague cases from the Thames marshes, [[William Gull]] told the House of Commons in 1854.  About a half came from [[Woolwich]] and [[Erith]], but cases also came from [[Wapping]] and [[Shadwell]], and along the river from [[Bermondsey]] and [[Lambeth]] and even [[Westminster]].  (At that time it was believed the disease came from breathing bad air — ''mal-aria'' — arising from marshes.  Gull recommended the marshes should be drained.){{sfn|Gull|1854|p=379}}

By the end of the Victorian era indigenous malaria had nearly disappeared from England,{{sfn|Bankoff|2018|p=482}} but a few cases survived into the 20th century enabling the disease to be positively identified by blood tests.  It was caused by the protozoan parasite ''[[Plasmodium vivax]]''.{{sfn|Dobson|1980|p=384}}{{sfn|Bankoff|2018|p=476}}

While the draining of the Thames marshes did not, by itself, eradicate malaria — in places the mosquito still abounds {{sfn|Dobson|1980|p=385}} — it may have been a contributory cause.{{sfn|Bankoff|2018|p=486}}  Why it did disappear is complex and uncertain.{{sfn|Dobson|1980|pp=382-9}}

===Today===
[[File:Tidal Thames floodplain.png|thumb|upright=1.4|'''The low-lying areas''' (dark blue) defended by the river walls, where 1.25 million people live or work.  (After Lavery & Donovan, 2005.)]]

The tidal Thames today is virtually a canal{{sfn|Smiles|1861|p=12}}{{sfn|Whitaker|1889|p=455}} — in central London, about 250 metres wide — flowing between solid artificial walls, and laterally restrained by these at high tide.{{sfn|Milne|1985|p=73}} For instance, the Victorian engineer [[James Walker (engineer)|James Walker]] reported that, if the walls were removed{{quote|the Thames would, at the very next tide, take possession of the large space that had been so long abstracted from it, and would be generally five times its present width.{{sfn|Walker|1842|p=532}} }}

It seems the continual processes of embanking and bank-raising have greatly increased the [[tidal range|tidal amplitude]],{{sfn|Bowen|1972|pp=187, 198|ps=. By constraining the incoming water into a narrow channel.}} which at [[London Bridge]] is now 6.6 m (nearly 22 feet),{{sfn|Uncles|Mitchell|2011|p=195|ps=.  (mean springs)}} and the constriction{{sfn|Walker|1842|p=533}} and [[Hydrodynamic scour|scouring]] have deepened the river.{{sfn|Spurrell|1908|p=355}}  Sarah Lavery and Bill Donovan of the [[Environment Agency]] warned:

{{quote|From Teddington in west London to [[Sheerness]] and [[Shoeburyness]] in the east, tidal defence is provided by the [[Thames Barrier]] at Woolwich, eight other major barriers owned and operated by the Environment Agency, 36 major industrial floodgates, 400 minor moveable structures in private ownership and 337 km [210 miles] of tidal walls and embankments [which] protect an estimated 1.25 million people living and working in the tidal flood plain.{{sfn|Lavery|Donovan|2005|p=1457|ps=.  Comma supplied after "east".}}  }}Those are just the walls within the purview of that report, for they do not stop at Sheerness and Shoeburyness.<ref>Hilda Grieve, the County of Essex archivist, recorded that "the county is a walled fortress. [From the [[River Stour, Suffolk|Stour estuary]] to the Port of London] more than 300 miles of man-made defences barricade its flat marshland borders against the thrusting tide": {{harvnb|Grieve|1959|p=1}}</ref>

The Thames Estuary has a defended tidal floodplain of 35,000 hectares (≈135 square miles) with 500,000 properties at risk from flooding. "Other assets within this flood-plain include 400 schools, 16 hospitals, eight power stations, dozens of industrial estates, [[London City Airport|the city airport]], 30 mainline railway stations and 38 underground and [[Docklands Light Railway]] stations, with this including most of the central part of [[London Underground|the underground network]]".{{sfn|Lavery|Donovan|2005|pp=1457, 1463-4}}

In London the Thames flows through an [[alluvial plain]], a geological formation which is two or three miles wide.  This plain, the river's natural [[flood plain]], is everywhere less than 25 feet (8 metres) above [[Ordnance Datum]] — sometimes less than 5 feet above.{{sfn|Ormsby|1922|p=251}}  (Very nearly, Ordnance Datum equals [[mean sea level]].)

The walls also affect London's [[water table]]:{{quote|Over sections of Kings and Lambeth Reaches, the walls act as total cut-offs with their footings set in the effectively impermeable [[London Clay]] beneath the gravels. Elsewhere, however, the walls are founded at shallower depths and hydraulic continuity is probably maintained.{{sfn|Gray|Foster|1972|pp=251}} }}
Hence in [[borehole]]s, [[groundwater]] levels in [[Battersea Park]] were observed to fluctuate with the tide; but just across the river in [[Chelsea, London|Chelsea]], hardly at all.  Nearly 7,000 tons of water have to be pumped from the [[Circle line (London Underground)|Circle Line]] daily to maintain track drainage between [[West Kensington station|West Kensington]] and [[Temple station|Temple]] stations.{{sfn|Gray|Foster|1972|pp=251, 253, 254, 255, 256}}

<gallery mode="packed" heights=270px>
File:London, Wapping -- 2016 -- 4765.jpg|'''Wapping:''' warehouses — now flats and a pub — built on the wall
File:2017-Woolwich, Hog Lane reconstructed river stairs & Thames wall 04.jpg|'''Woolwich:''' reconstructed wall and stairs
File:Thames foreshore near Ratcliff Cross Stairs.jpg|'''Limehouse:''' housing built on the wall
File:River Thames foreshore at London SW8.jpg|'''Nine Elms:''' wall near Vauxhall Bridge</gallery>

''Tributaries''.  Where a [[tributary]] e.g. the [[River Lea]] meets the Thames it is necessary to cope with tidal water escaping laterally.  This was done, traditionally, by providing the tributary with its own walls.  The tributary walls must be carried high enough upstream to meet the rising land.{{sfn|Downing|1864|p=30}}  In recent times some tributaries have been given barriers against exceptional tides e.g. [[Barking Creek]] and [[River Darent#Dartford Creek Tidal Flood Barrier|Dartford Creek]].

==Who built the walls?==
===Early speculations===
[[File:Sir William Dugdale from NPG.jpg|thumb|left|'''William Dugdale''', like other thinkers of his day, argued the walls must be Roman (National Portrait Gallery)]]
[[File:Ernest Board's Christopher Wren.jpg|thumb|'''Christopher Wren''' administering the first [[intravenous injection]] (Ernest Boardman, Wellcome Collection)]]

The Thames walls puzzled historians for centuries.  Early modern thinkers knew the Thames walls must be old, but could not account for their origins.{{sfn|Cracknell|1956a|p=13}}

The antiquarian Sir [[William Dugdale]]<ref>For the reliability of Dugdale as a source see {{harvnb|Wilmoth|1966|pp=281–302}}:  Underestimated by historians, "it deserves some credit as a carefully-researched piece with some genuinely innovative features".</ref> amassed a collection of legal records (1662) from which it was evident there were embankments along the Thames from the Middle Ages at least:
{{quote|To attribute it unto the [[Celtic Britons|''Britans'']] (the primary Inhabitants of this Nation) or to the [[Anglo Saxons|''Saxons'']], who succeeded them, I dare not adventure; the first of these, being a people so rude and barbarous, as they were not verst in any Arts; and the latter so illiterate, for the most part, as that little of invention can justly be ascribed to them. That it was therefore a work of the ''Romans'', whilst they were Masters here, as it is the opinion of some learned men, so do I make thereof no doubt.{{sfn|Dugdale|1662|p=16|ps=.  Dugdale wrote these words about Romney March, but he meant them to apply to the Thames embankments too.}} }}

The scientist and architect Sir [[Christopher Wren]] thought the walls were built to restrain wind-blown [[sand dune]]s, and attributed them to the Romans, for similar reasons.{{sfn|Cruden|1843|p=20}}  The influential Victorian engineer James Walker — who was himself to lay down the lines of the [[Thames Embankment]] in central London{{sfn|Bazalgette|1878|p=4}} — thought the same, adding{{quote|That they are the result of skill and bold enterprise, not unworthy of any period, is certain.{{sfn|Walker|1842|p=532}}{{sfn|Cruden|1843|p=43}} }}

[[Walter Besant]] was intrigued by the mystery.  He noticed several small chapels in unpeopled places along the northern wall: he surmised they had been devoted to pray for its preservation.{{sfn|Besant|1901|pp=110}}

One of the first writers to reject the "Roman" theory was Robert Peirce Cruden.  In his ''History of Gravesend'' (1843) he pointed out that the Roman authorities had no incentive to build embankments on such a scale, nor were any embanked marshlands mentioned in [[Domesday Book]] (1086).  He concluded that the Thames embankments between London and [[Gravesend]] were commenced early in the 12th century by [[religious house]]s for the purpose of reclaiming marshland "by easily executed approaches", and were completed in the 13th.{{sfn|Cruden|1843|pp=24-32}}  Some others including the [[Astronomer Royal]] were sceptical too.<ref>[[Samuel Smiles]] was one of the first to write biographies of engineers.  In his opinion the walls were built by immigrant "Belgian tribes" who were reclaiming marshland.  "The work was carried on from one generation to another, as necessity required, until the Thames was confined within its present limits".{{harvnb|Smiles|1861|pp=12–14}} Sir [[George Biddell Airy]] the Astronomer Royal too was sceptical of the Roman theory.{{harvnb|Airy|1865|pp=55–6|ps=.  "Whatever be the date of the mighty embankments which have given its present form to the river channel (and which, not without plausibility, have been supposed to be as late as [[Henry VI of England|Henry VI]]), there can be no doubt that they did not exist in the time of [[Claudius]]".}}</ref>

How the builders coped with 20 foot tides was not mentioned.

===Flaxman Spurrell===
[[File:Flaxman Spurrell Jr.png|thumb|upright=1.5|'''F.C.J. Spurrell''' (2nd from left, investigating a [[denehole]]) devoted his life to the Estuary's geology and archaeology]]
[[File:Spurrell's layers.jpg|thumb|upright=1.5|'''Section of River Thames''', Richmond to Gravesend (vertically exaggerated).  Clay deposition = sea gaining on land; peat growth = remissions; "THW" = [[Trinity High Water]] (Spurrell 1889).]]

In his ''Early Sites and Embankments on the Margins of the Thames Estuary'' (1885) F.C.J. Spurrell<ref>"The quiet man of Kent", F.C.J. Spurrell was an amateur geologist and archaeologist whose papers are still cited.  He had the means to devote himself full time to the investigation of the Thames Estuary.  "A diffident and somewhat cautious researcher, his publications are regrettably few and terse in tone, striving as he did always to present the 'bare facts' of his investigations": {{harvnb|Scott|Shaw|2009|pp=53, 56}}.</ref> described his fascination with the topic:-
{{quote|The sea-walls or tidal embankments of the Thames have not, I believe, ever been treated of before as a whole. I have for many years examined and mapped them, and made myself personally acquainted with the whole district of the Thames estuary, mainly for the purpose of learning what history they could be made to give of themselves.{{sfn|Spurrell|1885|p=285}} }}

====Sinking land, rising tide====
Spurrell had visited the excavations for the [[Royal Albert Dock, London|Royal Albert Dock]], the [[Port of Tilbury]] and [[Crossness Pumping Station]], and in each place he saw — 7 to 9 feet below the surface — traces of human habitation, including Roman-era pottery.  This level was on top of a layer of peat, and was covered by a layer of mud.{{sfn|Spurrell|1885|pp=275-6}}  There were multiple layers of mud and peat.  Spurrell thought the mud layers ("tidal clay"){{sfn|Spurrell|1889|p=212}} must have formed when the [[spring tide]]s deposited [[sediment]] (a process still observable in his day at certain river margins, called ''Saltings'').{{sfn|Spurrell|1885|p=272}}  But peat formation must have required a long period of freedom from the tide in order for the vegetation to grow, especially since Estuary peat was often associated with the roots of [[Taxus baccata|yew]] trees ("the yew is intolerant of water and cannot live in salt").{{sfn|Spurrell|1885|p=270}}

From these data, and from sightings of fossils like estuarine shells and [[diatom]]s, Spurrell proposed<ref>In the first paragraph of his paper.</ref> that the Thames was a freshwater river originally, but had been invaded by the sea, owing to subsidence of the land.{{quote|By the continued sinking of the land, the sea gradually crept up the valley until, at the present day, the ordinary tide reaches as far as [[Richmond, London|Richmond]].{{sfn|Spurrell|1885|p=269}} }}But, he said, the process was not uniform, because sometimes the land subsidence paused — maybe reversed — as was indicated by the peat layers.{{sfn|Spurrell|1885|p=270}}  He thought the [[tidal limit]] in Roman times was further down the river.{{sfn|Spurrell|1885|p=301}} The river was much shallower than today. It was "not too much to suggest that the tidal water, such as now reaches London, might then have been full five-and-twenty miles away".{{sfn|Spurrell|1889|p=212, 223, 224}}  As a later commentator explained, "The Romans did not build the embankments, not because they could not, but because they had no need to".{{sfn|Cracknell|1968|p=44}}

Spurrell's theory has been described as a "startling suggestion" since shown to be probably correct.{{sfn|Cracknell|1968|p=44}} "[M]ost modern authorities would agree with Spurrell (I889) that the alluvial plain was an area of marsh dissected by creeks, and that the tidal limit was further seaward than today".{{sfn|Akeroyd|1972|p=155}}  (The sinking of the land with respect to sea level is best described as relative, however, since it is a complex of several factors: see The advancing head of tide, below.)

====The origins of the walls====
[[File:Spurrell map Higham.jpg|thumb|upright=1.5|'''Archaeology: how farmland was won''', Higham, Kent.  Walls are marked (oldest to newest) ''a'' to ''f''.  Older river walls, obsolete, lie inland; newer walls needed to be taller as waters rose. Hatched = high ground.  Thames continues to deposit mud on Saltings at high spring tides. (Spurrell 1885)]]
[[File:Boydell Erith.jpg|thumb|upright=1.5|'''River walls, still irregular, Erith, Kent, 1750''' ([[John Boydell]]: Yale Center for British Art)]]

As a specimen<ref>Chosen because the archaeological evidence was best preserved.</ref> of his maps, Spurrell published the one shown here.  It had a network of walls enclosing reclaimed marshland near [[Higham, Kent]].  The highest walls were the current tidal defences; progressively lower walls lay inland and were (he said) the old defences. The Thames at high spring tides continued to deposit mud on the Saltings but of course not on the landside areas; these were now lower.  This was an instance of land reclamation by successive 'inning' of marshland (see below).{{sfn|Spurrell|1885|pp=287-9}}

Large amounts of Romano-British pottery could be found in the Kent marshes in Spurrell's day<ref>Probably because there had been pottery factories there in the Roman era, to take advantage of the abundant clay: {{harvnb|Evans|1953|p=116}}</ref>  ("I have seen over a hundred unbroken pots at one time, and such immense quantities of broken fragments, that the new embankment of the railway there was in places made of them".){{sfn|Spurrell|1885|p=277}}  But the levels of human occupation were feet below the present-day marsh:

{{quote|There was an abundant Roman population here, but if there are any banks in existence by which the sea was then kept out, they must be far out in the marsh, and I fear buried beneath its present surface; for all the present banks are mediæval or modern, here as elsewhere.{{sfn|Spurrell|1885|p=289}} }}

Towards the end of his life he wrote:{{quote|The walls were thrown up to win the land from the water, and it was not until the union of the parallel walls had been nearly or quite completed, that it was perceived that a much more important thing to the country at large had occurred, viz., the deepening and straightening of the common water-way [the Thames]. For as the parallel banks approached each other the tidal currents ran more swiftly and the scour increased, so that the waterway was shortened and larger ships could travel further inland.{{sfn|Spurrell|1908|p=355}} }}

In this waterway grew the largest port in the world.{{sfn|Hein|Schubert|2021|p=395|ps=.  London was still the largest port in the world as recently as 1960: p.396.}}

===Later research===
John H. Evans writing before the 1953 floods and using data from boreholes and similar sources found that Roman-era human occupation sites were well above the high water levels of the era, hence needed no defensive embankments.  But water levels continued to rise; so that (in his words):
* Throughout the Saxon period this land surface was gradually subsiding (or the tide advancing).
* Between A.D. 900 and 1000 the high Spring tide started to overflow over the lower parts of this land surface.
* By the twelfth and thirteenth centuries the overflow of the tide reached such frequency and proportions that the first river-walls were erected to exclude it.
* Since that time these river-walls have been constantly heightened and extended, nevertheless, during the whole history of inning down to the present century, inned marshes have been lost to the sea, some permanently.{{sfn|Evans|1953|p=129}}

Spurrell's theory was supported by the [[radiocarbon dating]] of Thames [[microfossil]]s by [[Robert Devoy]] (1979).<ref>In 1979 Robert Devoy completed a [[biostratigraphic]] study in the Estuary using radiocarbon dating of pollen, diatoms and other microfossil samples.  He proposed a model in which the sea has been rising relative to the land — not steadily, but with several [[marine regression]]s — for the last 8,500 years.  The last regression was around 200 AD (Devoy gave ~1,750 BP; BP means [[Before Present]], conventionally taken to be 1950 AD), but since about 1000 AD sea level has been rising rapidly "possibly reflecting increased embanking and building in the estuary".{{harvnb|Devoy|1979|pp=355, 388–9, 391}}  Since then Devoy's model has been widely referenced:
{{harvnb|Siddell|Wilkinson|Scaife|Cameron|2000|p=16}}.</ref>

==Building the walls: incentives and methods==
===Inning===
''Inning'' was<ref>According to John H. Evans, the procedure was still being used in his day (1953) in the North Kent marshes: {{harvnb|Evans|1953|p=108}}.</ref> a land reclamation process in which riverside marshland was enclosed and drained.  Starting from hard ground, typically farmers would build out into the marsh a pair of cross-walls, called ''counter walls''.{{sfn|Phillpotts|1999|p=63}}{{sfn|Bowler|1968|p=2}} Then they would complete the gap by building a wall between the ends.{{sfn|Spurrell|1885|p=286}}<ref>Or more simply "to dig a ditch around the edge of the marsh and to pile the excavated material in the form of an earthen rampart; when the clay batter was tamped tight it formed a water-tight barrier against the tide": {{harvnb|Evans|1953|p=108}}.</ref>  The strip of marshland was now enclosed, and could be drained. Such an enclosure was often called a ''hope'', which occasionally survives in English placenames.{{sfn|Evans|1953|p=138}}

Drained marshland was exceptionally fertile,{{sfn|Grieve|1959|p=4}} and might be worth two or three times (or even six times){{sfn|Galloway|2009|p=175}} as much as ordinary farmland, since grain could be grown and shipped to London (population 80,000), one of Europe's largest cities.{{sfn|Galloway|2013|pp=2-5 (author's preprint)}}  However as the land dried, the peaty soil shrank, lowering the surface well below high water mark,{{sfn|Whitaker|1889|pp=456-7}}{{sfn|Van Dam|2002|p=505}}<ref>But this was denied by archaeologist John H. Evans, who wrote that the marsh never really dries out, except for a superficial crust.  For Evans, the phenomenon was to be explained by the falling trend of the land relative to the sea: {{harvnb|Evans|1953|p=119}}.</ref> and making it all the more imperative to maintain the wall.{{sfn|Grieve|1959|p=4}}

<gallery mode="packed" heights="300px">
File:Traditional Thames wall.jpg|'''1'''
File:Spurrell tide banks of Thames.jpg|'''2'''
</gallery>

# '''Traditional Thames wall''' in Essex obtained by "inning" riverside marshland with (inset) a sluice for draining surface runoff water at low tide
# '''Mature farmland''' won by inning, Woolwich to Erith.  This map<ref>''Note:'' "Woolwich" in the top left-hand corner denotes ''North'' Woolwich, today part of [[Havering]].</ref> shows another pattern of old, new and cross-walls, probably initiated by the monks of [[Lesnes Abbey]].  The old walls having served their purpose are now inland.  "The oldest and strongest wall was that on which [[Belvedere railway station|Belvedere station]] stands; it may belong to the XIII century".  From Flaxman Spurrell's classic 1885 paper "Early sites and embankments on the margins of the Thames Estuary".  Today this land supports substantial towns.

Ditches were dug to drain the enclosed marsh. The water would flow out at low tide through a [[sluice]] set in the river wall.  Also, sluices were essential to allow [[surface runoff]] water to escape.  Though sluices varied, they were often made from hollowed tree trunks;{{sfn|Galloway|2015|p=20}} one design comprised a hinged flap that closed tight when the tide rose.{{sfn|Van Dam|2002|p=509}}  It was important to have a tight seal, for leakage would erode and widen any gap.  A storm surge could wash the entire sluice out of the embankment;{{sfn|Van Dam|2002|p= 513}} it was said to be "blown up". Captain Perry said that many inundations came through poorly designed or maintained sluices that blew up.{{sfn|Perry|1721|pp=10-12}}

If the river did break through, the water would flow onto neighbours' lands too, unless the counter walls had been properly kept up.  Most disputes between neighbours concerned failure to maintain in good condition the river wall, counter walls, sluices or drainage ditches.

Mature inned farmland had a characteristic pattern like a crazy chequerboard, old walls standing well inland, new walls constituting the river's tidal banks.

As far as the riverfront was concerned, the net result of inning in various places was a series of disparate river walls.  In time these were gradually connected to form a continuous wall.

====Materials====
[[File:1623 seawall remains canvey island.jpg|thumb|upright=1.2|'''Remains of a wall''' that had internal stakes (saltings, Canvey Island)]]

Traditionally, embankments in the Thames Estuary were made from clay dug out from the marsh,{{sfn|Spurrell|1885|p=286}} faced with bundles of brushwood or rushes to prevent erosion.{{sfn|Grieve|1959|p=11}}{{sfn|Galloway|2009|p=179}} Routine maintenance work consumed regular quantities of [[coppice]] wood each year.{{sfn|Galloway|2015|p=20}} Sometimes, to anchor them, walls were made from a core of driven stakes and bushes and faced with smooth clay; already in 1281 there is a record of this for Plumstead Marshes.{{sfn|Bowler|1968|p=47}}

The height of the walls was increased over time (see below) but this caused problems with stability, slumpage and slipping.  Later improvements have included facings of [[Kentish ragstone]],{{sfn|Cracknell|1957|pp=18-19}} tightly packed granite or sandstone{{sfn|Evans|1953|p=108}} to reduce erosion from navigational wash; the use of chalk instead of clay; protecting the walls with interlocking concrete blocks; and the use of gently sloping profiles to increase stability and absorb wave energy.{{sfn|Bowler|1968|pp=40-57}}

====Saltings====
Land on river side of the wall was called the ''saltings'', where spring tides deposited mud.  Salting was itself valuable grazing land for sheep.{{sfn|Galloway|2009|p=176}}  Vegetation in the saltings protected the wall from wave attack; to enhance this protection, local people were sometimes banned from cutting reeds.  Saltings — a natural form of flood defence — have now almost disappeared from the Thames owing to human intervention.{{sfn|Bowler|1968|pp=1, 11, 28, 48-50, 57}}

====Political consequences====
[[University of Minnesota]] [[medievalist]] [[:de:Bryce Lyon|Bruce Lyon]] argued that — as in other parts of Northwest Europe e.g. Flanders and Holland — the demand for motivated labour needed for land reclamation in the Thames marshes contributed to the rise of independent farmers and the decay of the feudal system.  "This definitely is the case around the estuary of the Thames".{{sfn|Lyon|1957|pp=47, 55, 57, 58-9}}

===The advancing head of the tide===
[[File:Toms, London Bridge.jpg|thumb|upright=1.2|left|'''Tidal rapids at London Bridge''', around 1730.  The old bridge acted like a weir; boatmen shot the rapids at their peril. ([[William Henry Toms]]: Yale Center for British Art)]]
[[File:Hubert Pugh, London Bridge.jpg|thumb|upright=1.2|'''''London Bridge from the Old Swan'''''.  Prudent passengers preferred to alight at the Old Swan, and walk. ([[Herbert Pugh]]: Bank of England Museum)]]

Today, the River Thames is macro-tidal at [[London Bridge]], and is tidal as far upriver as [[Teddington Lock]].  This was not always so.

In the last 6,000 years (at least) sea level in southeast Great Britain has been rising relative to the land, owing to sinking of the land mass by [[compaction (geology)|compaction]], [[subaerial unconformity|subaerial erosion]], long-term [[tectonic]] movement and [[isostatic adjustment]], as well as [[eustatic]] sea level changes and even human activity.{{sfn|Akeroyd|1972|pp=154-5}}

According to one estimate it has been doing so at an average rate of up to 13–16&nbsp;cm per century; the rate has not been constant, and there have been temporary reversals.  In the Roman period the London alluvial plain was an area of marsh dissected by creeks; the tidal limit may have been as far downriver as [[Crossness]].{{sfn|Akeroyd|1972|pp=154-5}}  On that estimate there would have been no tide at London Bridge at all.  [[Gustav Milne]] thought there was a small tide at Londinium, falling back to nothing in the late Roman period.{{sfn|Milne|1985|pp=73-4}}  Research on this topic continues; it includes dating excavated wharves and [[tide mill]]s by [[dendrochronology]].{{sfn|Sidell|Wilkinson|Scaife|Cameron|2000|p=110}}{{sfn|Goodburn|Davis|2010|pp=12-13}}

While river-bank dwellers might be prepared to live with occasional storm flooding, tidal high water occurs twice every 25 hours or nearly so.  Thus as the tidal head advanced — and the tidal range increased — there would have come a time when the water routinely overflowed or eroded the natural river bank unless artificial banks were made.

At first, low walls sufficed (archaeologists discovered one embankment in north Kent had been only 1.2 metres high).{{sfn|Galloway|2009|p=179}}  As water levels rose over the centuries the walls were raised.  Explained Flaxman Spurell:
{{quote|Many writers are impressed with the "mighty", "stupendous", or "vast" embankments which keep out the water of the river, while [[William Dugdale|Dugdale]] and [[Christopher Wren|Wren]] seem to have thought that because they were so great, none but Romans could have raised them. There is no need for such expressions.  The height to which we see them now rise, is the gradual increase from slighter banks which costs but little exertion, although regular attention.{{sfn|Spurrell|1885|pp=286-7|ps=.  "Even were this not so, there is nothing astonishing in the banks of the Thames, however it might apply to those of the Netherlands. The most difficult place for embanking in the Thames is [[the Swale]] marshes, and I am informed that there was lately made an enclosure of 200 acres in Slayhill marsh which took two years, with an average employment of 30 workmen; an enclosure at Milford hope was accomplished at a much less labour from the diminished trouble caused by creeks. These banks look formidable, and are really so, compared with those higher up."}} }}

===In response to storm surges===
[[File:The Half-Brick Inn.jpg|thumb|upright=1.4|'''Storm surge'''. The Half-Brick Inn, 1867 (Edwin Compton: Worthing Museum and Art Gallery)]]
{{Quote box|width=25em|align=right|fontsize=92%|bgcolor=#E6FFEE|title=1573 A.D.|quote="Marsh wall too slight, strength now or good night" — Thomas Tusser, ''October's Husbandry''<ref>From Thomas Tusser, ''Five Hundred Points of Good Husbandry'', London, 1573, quoted Michael Hattaway, ''Thresholds: Engineering and Literature East of the City''.</ref>}}

That keeping up the banks cost "little exertion" may have been true in Spurrell's day, but not in the late Middle Ages.  The era 1250-1450 was characterised by a deteriorating climate, [[storm surge]]s and serious flooding.  This topic has been researched by Hilda Grieve and particularly James A. Galloway who have examined the accounts of medieval monasteries and manors.

Storm surges, explained Galloway, are caused by {{quote|movement of deep Atlantic depressions around the north of Scotland, subsequently veering south into the North Sea. This can produce a wind-driven piling up of water in the shallow and narrow North Sea basin and, when combined with a high tide, can lead to disastrous flooding and major loss of life in the low-lying coastlands of the Netherlands, Belgium and England."{{sfn|Galloway|2009|p=174}} }}They made for freak high tides in the Thames, especially if coinciding with unusually heavy land flooding{{sfn|Redman|1878|p=35}} (e.g. from a snow melt<ref>As in the 1928 London flood, for instance.</ref> or a heavy rainstorm).

The river broke through the wall at [[Bermondsey]] (1294); [[Southwark]] (1311); [[Dagenham]], and between [[Greenwich]] and Woolwich (1320s); [[Stepney]]<ref>Probably the Isle of Dogs, then known as Stepney Marsh.</ref> (1323); the North Kent marshes (1328); Southwark (again), between Greenwich and [[Plumstead]], [[Stone, Kent]] (1350s) and Stepney (again) (1369); [[Barking, London|Barking]] (1374-5); [[Dartford]], Erith (1375) and elsewhere.  The [[Black Death]] pandemic killed so many labourers it became harder to keep up the walls.{{sfn|Galloway|Potts|2007|pp=370-379}}  Later, the [[dissolution of the monasteries]] may have caused loss of local expertise with consequent wall breaches that were not repaired for decades e.g. at [[Lesnes Abbey]] (Plumstead and Erith).{{sfn|Galloway|2010|pp=3-4, 6, 14}}

These were violent incursions of water, not smooth increases.  The walls were rebuilt a step higher and stronger, accordingly.{{sfn|Galloway|2009|p=179}}{{sfn|Grieve|1959|pp=7, 8}} Likewise, after the [[North Sea flood of 1953]] the walls were systematically raised in many places.  A height of 18 feet was recommended for agricultural land, more for built up areas.{{sfn|Bowler|1968|pp=40-57}}  The lines of the existing walls were generally retained, although some new walls were built to dam off creeks.{{sfn|Cracknell|1956b|pp=356-8}}

Quite often, inned lands were abandoned permanently to the river and reverted to salt marsh; they still had value for fishing, willows and reeds (for basket-making, thatching, flooring).   "Horse-shoes" are evidence of this. Even on relatively modern maps, "characteristic horse-shoe shaped 'set- backs' reveal where sea or river walls had been breached, and the line of the wall set back around the deep scour hole which had resulted from the movement of water in and out through the narrow gap."{{sfn|Galloway|2013|p=6}}  Some examples are given below.

===Encroachment into the stream===
[[File:Hemy, The Barge Builders.jpg|thumb|upright=1.4|'''River frontage was valuable property'''.  ''The Limehouse Barge Builders'' c.1880 (Charles Napier Hemy: South Shields Museum and Art Gallery)]]

Where human activity beside the river was industrial or commercial there was an incentive{{sfn|Ayre|Wroe-Brown|2015|p=195, 253, 256, 268}} not only to make banks but to encroach out into the navigable stream.  Here the walls were made by making timber revetments and backfilling with rubbish.  The process was repeated over time.

River frontage was valuable property.{{sfn|Morris|Cozens|2013|p=87}}{{sfn|Tyler|2001|p=90}}  Passengers and goods were best carried by water,{{sfn|Llewellyn Smith|1939|p=199}}{{sfn|Johnson|1995|p=18}} which required river access and landing facilities.  River access was convenient for trades that dumped offensive by-products.{{sfn|Dyson|1981|p=37}}  Other trades that needed river access included barge-building, ship repairing and [[lighter (barge)|lighterage]].  Some retail establishments, such as marine stores and taverns for mariners,{{sfn|Morris|Cozens|2013|p=89}} benefitted from access to the waterfront.

"As long ago as 1848", wrote Martin Bates, "Sir [[William Tite]] had deduced that nearly all the land south of [[Thames Street (London)|Thames Street]] in the City of London 'had been gained from the river by a series of strong embankments'."  Evidence of such land gain is now commonplace.{{sfn|Milne|Bates|Webber|1997|p=136}}

Although they have not been investigated very systematically by historians, there were complaints of encroachments into the river.  Some said it ought to be illegal; others said it was illegal but law enforcement was slack.{{sfn|Janssen|1770|pp=3-7, 17-23}}{{sfn|Colquhoun|1800|pp=299, 301, 302, 313-6}}{{sfn|Walker|1842|pp=530, 605-6, 609}}{{sfn|Cruden|1843|pp=41-2}}{{sfn|Milne|1981|p=36}}{{sfn|Dyson|1981|p=37}} One of these, [[Granville Sharp]], said the City's [[water bailiff]], who was supposed to stop these encroachments, would turn a blind eye for "Fees and Christmas Compliments".{{sfn|Sharp|1771|pp=vii, vii, xii-xiii, xvi}}

Wrote [[John Ehrman]]:
{{quote|One observer reckoned that between London Bridge and [[Gravesend]]  the wharves and warehouses, with their piers and steps, were covering 300 to 400 feet of new ground during each year of [[James II]]'s reign...  As the waterfront was built over, so the river silted up off the new walls and landing stages, and by 1687 the Navy Board estimated the channel of the Thames had been narrowed by one-fifth by the "new encroachments".{{sfn|Ehrman|2012|p=83}} }}

The illustration shows the river front at [[Narrow Street]], Limehouse.  Archaeologists believe that Narrow Street represents the line of the medieval river wall, which was originally built for 'inning" marshland.{{sfn|Divers|2000|p=53}} But the brick houses are to the river side of the street, and presumably were constructed by encroaching on the river and reclaiming the foreshore; archaeological excavations have tended to confirm this.{{sfn|Tyler|2001|pp=53, 55, 56, 58, 61, 90, 91}}{{sfn|Killock|Meddens|2005|p=3}}{{sfn|Bluer|1994|ps=.  "The earlier phase was associated with reclamation from the river, accomplished by a timber revetment constructed soon after 1584. Dumps of crushed bricks made up the ground level prior to the construction of the brick buildings, which would have fronted onto Narrow Street."}}

Specific instances are given below.

==Law and administration==
[[File:Dugdale Imbanking.jpg|thumb|'''Dugdale's book (1662)''' was the first to investigate the walls]]

===Marsh law===
{{distinguish|Martial law}}
The inhabitants of [[Romney Marsh]] in Kent were the first in England to establish amongst themselves customary laws about responsibility for keeping up embankments in a [[cooperative]] community.  Later the judges applied the "custom of Romney Marsh" in other marshlands; thus it became part of the common law of England,{{sfn|Fletcher|1844|p=144}}{{sfn|Richardson|1919|pp=389-91}}{{sfn|Grieve|1959|p=9}}{{sfn|Owen|1967|p=36}}{{sfn|Bosselman|1996|p=286}} including the Thames.  A record shows it was already being applied — in [[Little Thurrock]] — in 1201.{{sfn|Grieve|1959|p=6}}

The fundamental principle was that every occupier of land who benefitted from the existence of a wall was obliged to contribute to the effort of keeping it up, and to do so in proportion to the size of his holding.{{sfn|Kennedy|Sandars|1884|pp=107-9}}{{sfn|Grieve|1959|p=8}}  Disputes were adjudicated by 24 ''jurats'' who had sworn to tell the truth and act righteously. A bailiff admonished people to keep up their walls; if they neglected to, he did it himself, and charged them.{{sfn|Fletcher|1844|p=144}}{{sfn|Grieve|1959|p=9}}

Occupiers of down-sloping land that did not benefit from the wall's existence did not have to contribute.{{sfn|Kennedy|Sandars|1884|p=119}} (Centuries later, the inhabitants of [[Hampstead]] were to use that principle to get off paying sewerage rates.){{sfn|Hanley|2006|pp=355-6}}  Thus each ''level'' of inned marsh was a separate community or regime.

Because of a controversial interpretation of Magna Carta (next section) the law could not compel people to make new walls, only repair existing ones.

The mutual liability principle applied in cooperative communities only.  In ''Hudson v. Tabor'' (1877) the defendant neglected to keep up the height of his wall. There was a very high tide, it overflowed his wall, and the floodwaters ran onto his land — and his neighbour's too, causing damage.  The Court of Appeal ruled he was not bound to compensate his neighbour for the loss.  This was because there was no pattern of cooperative behaviour by which each person bore his proportionate share of the cost of upkeep: in this district, each frontager looked after his own.  By not establishing a cooperative regime the neighbours chose to run the risk. {{sfn|Hudson v. Tabor|1877|pp=740-741}}

Marsh law had many aspects about using the common resource for the benefit of all.  [[Chicago-Kent]] law professor Fred P. Bosselman argued that marsh law ought to guide decisions of American state courts on wetlands use.{{sfn|Bosselman|1996|pp=247-337}}

===Administration===
[[File:British School - Chaucer - 1441684 - National Trust.jpg|thumb|'''Geoffrey Chaucer''', responsible for Thames walls (National Trust Images)]]

Sometimes local communities were overwhelmed or defeated e.g. by storm surges, or internal dissensions, and needed help to repair the walls.  It was the duty of the king to protect his realm from attacks and this included the violence of the sea.  The English kings took to sending out commissions to repair the walls and settle disputes.  These commissioners had emergency powers: they could make laws, collect taxes, adjudicate disputes and impress labour.{{sfn|Kennedy|Sandars|1884|pp=31-34}}{{sfn|Fletcher|1844|p=145}}

Their descent on a district could cause resentment, however, especially if they compelled local people to make or pay for new walls.  Hence{{sfn|Kennedy|Sandars|1884|pp=33, 60}} (although this interpretation is controversial) [[Magna Carta#Great Charter of 1297: statute|Magna Carta]] provided:{{quote| (15) No Town nor Freeman shall be distrained to make Bridgęs nor Banks, but such as of old time and of right have accustomed to make them in the time of King Henry our Grandfather.}}
{{quote|(16) No banks shall be defended from henceforth, but such as were in defence in the time of King Henry our Grandfather; by the same places, and the same bounds, as they were wont to be in his time.{{sfn|Ruffhead|1769|p=5|ps=.  Edward I 1297 confirmation and enactment}}}}

Because the most important point concerned land drainage, these bodies came to be  called ''Commissioners of Sewers''.{{sfn|Kennedy|Sandars|1884|pp=31-34}} (A ''sewer'' was simply a rainwater ditch for draining land.  The word acquired no "sanitary" connotation until after 1815, when it was first made legal, and then compulsory, to discharge human waste into London's sewers instead of in [[cesspits]].{{sfn|Bazalgette|1865|p=5}}{{sfn|Owen|1967|p=35}} )

An example is [[Geoffrey Chaucer]], who in 1390 was appointed to  a commission sent to survey the walls between Greenwich and Woolwich, and compel landowners to repair them, "showing no favour to rich or poor".  The commission had power to sit as Justices according to "the Law of the Marsh". Chaucer while on these duties lived at Greenwich,{{sfn|Kirk|1900|p=xxxviii}} where he was writing his [[Canterbury Tales]].

Eventually, the [[Statute of Sewers]] 1531 of Henry VIII{{sfn|Raithby|1811|p=104}} made these commissions permanent.  They existed in all parts of England. In 1844, a legal expert, speaking of the sewers of London, said "the metropolis is at the present moment, in the eye of the law, under the ancient and approved drainage laws of the Marsh of Romney in Kent".{{sfn|Fletcher|1844|pp=143-4}}  The Commissioners continued to exist until 1930; their detailed records are a rich resource for historians.{{sfn|Owen|1967|pp=36-8}}

==Some instances==
[[File:William Daniell Sheerness.jpg|thumb|upright=1.2|'''''Sheerness''''', c.1813 ([[William Daniell]], Tate Britain)]]
No systematic record of the Thames walls has been kept, except perhaps those of the present day, and they are unpublished.  The resources available to the historian are casual and sporadic.

Old maps can reveal the walls (and the essential drainage ditches) but the detail is poor until Joel Gascoyne's [[Joel Gascoyne#The parish of St Dunstan Stepney, the incipient East End of London|survey of East London of 1703]].{{sfn|Johnson|1995}}

Foreshore archaeology, where permitted, has yielded valuable clues, particularly in the City of London, Southwark, Wapping, Shadwell and Limehouse.<ref>See e.g. the archaeological papers cited in the ensuing sections of this article.</ref>  Further upstream the clues may have been obliterated by the Victorian Embankments.

Placenames offer hints e.g. [[Bankside]]; [[Wapping Wall]]; "the name ''Flemingges wall'' in 1311 attests how early foreigners were employed here [Erith]".{{sfn|Spurrell|1885|p=302}}

Artworks may be records, especially of West London, though because of [[artistic licence]] caution is needed.

Legal records go back far, though not to the time the walls were first built.  The science of geology allows an understanding of what was desirable and feasible.

There may never be a comprehensive history of the Thames walls.  The following are some instances.

===City of London===
[[File:General view of City of London 16C.jpg|thumb|upright=1.2|'''''A General View of the City of London, next the Thames''''' c.1770    (Unknown artist: Yale Center for British Art)]]
[[File:Lower Thames Street, London (4333246424).jpg|thumb|upright=1.2|'''Lower Thames Street today''', no river in sight, but a bustling waterfront in Roman times,]]

The City of London's Thames as depicted by 18th-century artists has a generally uniform waterfront with elevated embankments (see illustration).  But this was a constriction of the natural river.

From 1973 onwards, said [[Gustav Milne]], [[rescue dig]]s were regularly undertaken along the London waterfront.
{{quote|This long-running rescue archaeology programme was full of surprises. To begin with, it was discovered that the river bank in the first century AD did not lie below the modern quayside, but some 150m to the north.{{sfn|Milne|1985|p=72}} }}

In a later paper:
{{quote|It has now been shown that all the land to the south of Thames Street has been reclaimed in a piecemeal manner from the river, starting in the Roman period and continuing from the tenth to the fifteenth century. Each extension was usually achieved by the erection of a timber [[revetment]] upon the foreshore, behind which was dumped an assortment of domestic or other waste, sealed by the surfaces of the yards or buildings laid out over the newly-won land. The mile-long London waterfront thus represents an artificially created tract of land up to 100 metres wide.}}

The "mile-long" waterfront was the southern limit of the whole of the City of London and ran from the [[Fleet River]] in the west to the [[Tower of London]] in the east.{{sfn|Archibald|Lang|Milne|1995|pp=165, 166}}

Excavations near London Bridge revealed that waterside encroachment, although starting in the Roman era, advanced mainly between the 11th and 16th centuries: a period of 500–600 years.  As well as winning land the probable motive was to keep up the harbour and prevent erosion.{{sfn|Milne|1981|pp=32-36}}

At [[Queenhithe]] in the 12th century the embanked area was extended south in five stages by nearly 32 m.  According to the site's excavators,{{quote|extending and improving valuable riverside commercial property appears to have been the main aim, doubtless spurred on by competitive neighbours engaging in similar projects, although rising river levels in the twelfth century would have  increased the need to build higher and sturdier waterfronts as flood defences...

[T]here appears to have been a cycle of encroachment and reinstatement, suggesting that the owners or tenants often tried to win a few extra centimetres from their neighbours whenever the opportunity arose.{{sfn|Ayre|Wroe-Brown|2015|p=195, 253, 256, 268}} }}

===Westminster and Whitehall===
In 1342 the walls from around Westminster to [[Temple Bar, London|Temple Bar]] were "broken and in decay by the force of the tides"; a commission was sent to view and repair them.{{sfn|Dugdale|1662|p=71}}  (Then, the [[Strand, London|Strand]] was the river front — as its name implies.){{sfn|Bazalgette|1878|p=2}} Thereafter these walls seem to have been built more sturdily since no more physical breaches are recorded by Dugdale; however they were sometimes overflowed by abnormally high tides. Since the area is low-lying the floods were notable.  In 1235 the tide rose so high that the lawyers were brought out of [[Westminster Hall]] in boats.  In 1663 — [[Samuel Pepys]] said it was "the greatest tide that ever was remembered"{{sfn|Lavery|Donovan|2005|p=1456}} — all [[Whitehall]] was drowned.{{sfn|Bazalgette|1877|p=2}}

<gallery mode="packed" heights="230px">
File:Hollar Westminster.jpg|'''1'''
File:Westminster Hall edited.jpg|'''2'''
File:Hollar Whitehall.jpg|'''3'''
File:Richard Wilson 1744.jpg|'''4'''
</gallery>

# '''City of Westminster, 1642'''.  Despite these seemingly robust walls, ultra-high tides went over them ([[Wenceslaus Hollar]]: Yale Center for British Art)
#  '''Westminster Hall''', seat of the higher English law courts, could be flooded chest-deep by those tides ([[Thomas Rowlandson]] and [[Augustus Pugin]])
# '''Whitehall c.1650'''.  The whole district was drowned in 1663 (Wenceslaus Hollar: Yale Center for British Art)
# '''Building Westminster Bridge, 1744'''.  Notice the perfunctory river walls upstream: a diasaster waiting to happen ([[Richard Wilson (painter)|Richard Wilson]] (detail): Tate Britain)

In 1762 a tide flowed into Westminster Hall covering it to a depth of 4 feet.  In 1791 a tide overflowed the banks above [[Westminster Bridge]]:{{quote|Boats came through the passage of [[Old Palace Yard]] from the Thames, and round up to Westminster Hall gate.  The two Scotland Yards, [[Privy Garden of the Palace of Whitehall|Privy Gardens]], Whitehall, were under water... Westminster Hall suffered much; the water ran in at the great door for upwards of an hour, and was up to the second step leading to the [[Court of King's Bench (England)|Court of King's Bench]].{{sfn|Bazalgette|1877|p=2}} }}

===South Bank===
====The medieval wall and Lambeth Marsh====
A commission was sent to view and repair the banks "betwixt Lambehethe and Grenewiche" in 1295, and again to Lambeth in 1444 — this time to provide for its proper governance "according to the Laws and Customes of Romeney Marsh".{{sfn|Dugdale|1662|pp=66, 67-68}} Lambeth itself was a marsh.

Present-day walkers along Belvedere Road and its continuation Upper Ground, SE1, cannot see the Thames, yet they are actually following the line of the medieval river wall.{{sfn|Roberts|Godfrey|1994|pp=45-6}}  Already in the Elizabethan era that wall, called ''Narrow Wall'', no longer fronted the river but stood inland, where it served as a causeway through the marsh.  Between Narrow Wall and the Thames there was a wide strip of marshy ground overgrown with rushes and willows;<ref>Which could be exploited.</ref> this is shown on Norden's map of 1593.  The road continued to be called Narrow Wall until the late Victorian era.

A map of 1682 shows Lambeth, except for the river front, remained open marsh and pasture ground intersected with many drainage ditches.{{sfn|Roberts|Godfrey|1994|pp=45-6}}  The land was not developed until Waterloo Bridge was built (1817).{{sfn|Roberts|Godfrey|1994|p=1}}

<gallery mode="packed" heights="180px">
File:Norden 1593 Lambeth Marsh.jpg|'''1'''
File:Lambeth Marsh 1739.jpg|'''2'''
File:Belvedere Rd-Upper Ground.jpg|'''3'''
File:Upper Ground - geograph.org.uk - 490622.jpg|'''4'''
</gallery>

# '''[[Lambeth Marsh]] in 1593'''.  The orange strip is the Elizabethan river wall.  The white strips are obsolete river walls, by now standing inland, and include Narrow Wall — today Belvedere Road and Upper Ground, SE1.  Notice "The sluce".  (Map by [[John Norden]], highlighted detail)
# '''Lambeth Marsh about 1740'''.  The roads served as causeways through the marsh; possibly, all were former river walls or counter-walls.  The red arrow denotes Narrow Wall.
# '''Line of medieval Narrow Wall''' shown on a modern OpenStreetMap.
# '''Tour de France''' cyclists riding it (Upper Ground, SE1).

====The wall as a flood defence, or otherwise====
{{Quote box|width=25em|align=right|fontsize=92%|bgcolor=#E6FFEE|multiline|title=1853 A.D.|quote=Q.  You are the Rector of Lambeth?  A. I am.
Q. Are the banks of the Thames adjoining the parish of Lambeth in good repair?  A. They are, but they are not high enough; we suffer very much from floods.
Q. Do floods frequently occur?  A. Whenever we have high tides.{{sfn|Dalton|1854|p=336}} }}

The area was always liable to flooding.  In 1242 the river overflowed the Lambeth banks "drowning houses and fields for the space of six miles".{{sfn|Parliamentary Gazetteer|1847|p=299}}

"The surface of this area is mostly below the level of high water", [[Sir Joseph Bazalgette]] told the engineering profession in 1865.  The traditional sewers were supposed to discharge into the river, but could do so at low tide only.  After heavy rains they backed up for days on end: sewage flooded the basements and accumulated in the streets. The area was wet and "malarious". To relieve this, Bazalgette built his Low Level [intercepting] Sewer through the district.  Effluent was carried away, not by gravity now, but by steam-powered pumps.  He compared the effect of pumping to elevating the whole district by 20 feet.{{sfn|Bazalgette|1865|p=29}}

The [[Albert Embankment]] (completed 1868) was not meant to be a flood defence, since it was built on arches to allow vessels to enter [[draw dock]]s, etc.{{sfn|Richardson|1877|p=174}}  It was up to riverside proprietors to maintain their river walls, but many failed to make them high enough to cope with unusual tides.  They said "What is the use of doing it unless their neighbours do it also?", Bazalgette told the House of Commons. The poor, whose houses stood in the low-lying districts behind, suffered most.  Bazalgette saw houses where the water had reached six or seven feet above the floor.  "The people were driven out of them into the upper floors".  For a few thousand pounds this could have been prevented.{{sfn|Bazalgette|1877|pp=7-8}}  Bazalgette's [[Metropolitan Board of Works]] sought legal powers to compel them.

<gallery mode="packed" heights="170px">
File:Hollar Lambeth Palace.jpg|'''1'''
File:Boydell lambeth.jpg|'''2'''
File:Thames overflow, Lambeth.jpg|'''3'''
File:Lambeth boatbuilders 1853.jpg|'''4'''
File:Pether 1862.jpg|'''5'''
File:Lambeth waterfront c.1860.jpg|'''6'''
File:Lambeth flood refugees.png|'''7'''
</gallery>

# '''[[Lambeth Palace]] in 1647'''.  Then, a fairly low embankment sufficed.  (Wenceslaus Hollar: Fisher Hollar Collection, Toronto) 
# '''A glimpse of Lambeth Marsh in 1752''' (John Boydell: Yale Center for British Art).  ''Caution:'' trees will not grow on recently drained marsh.
# '''Thames overflow, 1850''' near Lambeth Stairs (''Illustrated London News'', 2 February 1850).  Lambeth Stairs is shown in images 1 and 5, about where [[Lambeth Pier]] is today.
# '''Lambeth boatbuilders c.1853'''.  Boatbuilding, an important local industry, did not go well with high river walls.  The boats on Searle's slipway are the [[Leander Club]]'s: it was their headquarters. City livery barge moored at centre.  The site is now [[St Thomas' Hospital]]. (Richard John Pembery: Lambeth Archives)
# '''Foreshore at Lambeth Palace''' shortly before the Albert Embankment was made (Henry Pether, 1862, Government Art Collection)
# '''Lambeth waterfront 1860-5''', low tide.   Short ladders suffice to surmount dilapidated river wall. (Unknown photographer: Historic England)
# '''Flood refugees''', Lambeth, 1877.  The Albert Embankment was not designed for flood protection.  At unusually high tides poor people were forced out of their homes.  (John Thompson, [[Woodburytype]] process)

Lambeth was badly affected by the [[1928 Thames flood]], people drowning in their basements.

For the [[Festival of Britain]] (1951) a large expanse of bomb-damaged riverside property was used to make a new embankment wall and create the [[South Bank]].{{sfn|Roberts|Godfrey|1994|p=1}}

===In art: West London===
The embanking of the Thames in response to the rising tidal head happened too long ago to be captured in art — in most places.  But in West London the tide is comparatively recent and, in parts, small even today.{{sfn|Uncles|Mitchell|2011|p=95}} Hence pre-Victorian paintings often depict a river with natural banks.<ref>Flooding caused by heavy rainfall would have overflowed these; but this was occasional, not diurnal.</ref>  Later, modest erosion defences are made, and gradually join up, as in illustrations 5 and 6.  The removal of old London Bridge (1834) increased the tide upstream and caused more flooding in the upper districts.{{sfn|Bazalgette|1877|pp=21-22}}  Very few papers have been published about the waterfront riverside communities in this area.{{sfn|Steyne|2013|p=2}}

<gallery mode="packed" heights=200px>
File:Combe Putney Bridge.jpg|'''1'''
File:Bluck 1809.jpg|'''2'''
File:Calcott Richmond Bridge.jpg|'''3'''
File:Cox Millbank.jpg|'''4'''
File:Parrott Putney.jpg|'''5'''
File:Hughes Putney embankment.jpg|'''6'''
</gallery>

# '''Fulham in 1792''', old [[Putney Bridge]] in distance.  Notice the natural river bank — and its erosion.  ([[Joseph Farington]] R.A., print)
# '''Cottage, Battersea, 1809'''   (John Bluck : Yale Center for British Art)
# '''Richmond Bridge about 1810''' (Sir [[Augustus Wall Callcott]] R.A.: Yale Center for British Art)
# '''Millbank 1810''' ([[David Cox (artist)|David Cox]]: Yale Center for British Art)
# '''Putney about 1840'''.  Occasional erosion defences have still not joined up.  (William Parrott: Wandsworth Collection)
# '''Putney about 1880'''.  Now the title is "''The Embankment'', Putney, London". (George Frederick Hughes: Wandsworth Collection)

<center>'''Gallery'''</center>

<gallery mode="packed" heights=180px>
File:Scott sunset 9 elms.jpg|'''1. Nine Elms c.1755'''
File:The Thames From Millbank.jpg|'''2.  Millbank, prob. c.1815'''<ref>Painted dated by the Victoria and Albert Museum to c.1836, but the scene depicted is probably earlier.  By 1836 this path had become a road carrying heavy vehicles and the river had been embanked by Robert Smirke.  (See London parliamentary embankments, below.)</ref> 
File:Pym Battersea Bridge.jpg|'''3.  Battersea c.1823'''
File:Heath Cheyne Walk.jpg|'''4.  Chelsea 1825'''
File:Byrne Hammersmith.jpg|'''5.  Hammersmith Bridge 1827'''
</gallery>

# "A Sunset", woodyard on the left ([[Samuel Scott (painter)|Samuel Scott]]: Tate)
# ([[Richard Redgrave]] R.A.: Victoria and Albert Museum)
# "The Old Red House" c.1823 (H. Pymm: YCBA)
# Cheyne Walk looking towards Battersea Bridge, 1825 ([[Charles Heath]]: YCBA)
# Barnes on the left, Hammersmith on the right ([[Letitia Byrne]]: YCBA)

===East London===
[[File:Limehouse in 1750.jpg|thumb|upright=1.4|'''River wall at Limehouse''', 1750.  Notice the ladders.  (John Boydell: Yale Center for British Art)]]
{{Quote box|width=25em|align=right|fontsize=92%|bgcolor=#E6FFEE|title=1325 A.D.|quote= "The Jurors did present upon their Oaths; that a certain person of antient time Lord of the Mannour of ''Stebenhethe'' [Stepney], whose name they knew not, did by his industry recover a certain Marsh there, contain∣ing about an hundred Acres of Land, which Marsh was then drowned by the overflowing of the ''Thames''..." — Dugdale, ''History of Imbanking'', XV}}
{{Quote box|width=25em|align=right|fontsize=92%|bgcolor=#E6FFEE|title=1536 A.D.|quote= "Whereas one Cornelius Vanderdelf of Barowe in Brabant in the parts beyond the Sea at his own proper cost and charge according to the King's high pleasure and commandment hath workmanly and substantially inned and fenced a certain ground containing by estimation 130 acres, lying and being besides St Katharine nigh unto the Tower of London and in the parish and town of Stepney, which 130 acres abut upon the highway leading from London to Ratcliff on the north part and upon the Thames on the south part, and the east part abutteth upon the Town of Ratcliff  and the west part abutteth upon St Katharine aforesaid, which ground heretofore was continually for the most part surrounded drowned and overflown by the Water of the River of Thames ..." — Statute of Henry VIII.{{sfn|Vanderdelf's Act|1536|p=586}}<ref>Spelling modernised by Wikipedia.</ref> }}
[[File:Francis Holman, Wapping, 1784.jpg|thumb|upright=1.4|'''''A Dockyard at Wapping''''', 1784.  By this date the river wall (note houses thereon) was secure; dockyards and wharves encroached out into the stream.  (Francis Holman: Tate Britain)]]
[[File:Shadwell by the Ship Inn.jpg|thumb|upright=1.4|'''Shadwell''', c.1795.  The waterfront was packed with marine industries, fire insurance unprocurable. (George Shepheard, ''The Ship Inn'': Yale Center for British Art)]]

East of the [[Tower of London|Tower]] were the riverside hamlets of Wapping, Shadwell, [[Ratcliff]] and Limehouse, all part of the medieval manor of Stepney.  The whole area is flat and low-lying.{{sfn|Johnson|1995|p=17}}  There was a long history of trying to reclaim the river marsh, defeated by breaches of the river wall caused by abnormal tides.

It was possible to walk from the Tower to Ratcliff along a gravel clifftop overlooking the Thames marsh.  This was the [[Ratcliff Highway]], a route already used in the Roman era.{{sfn|Johnson|1995|pp=16, 17}}{{sfn|Baker|1998|pp=1-7}}  South, however, was "a low-lying swamp flooded daily by the tide and known by the suggestive name 'Wapping in the Wose'",{{sfn|Llewellyn Smith|1939|p=199}} or simply Wapping Marsh or Walmarsh.{{sfn|Baker|1998|pp=1-7}}

This close to London, perhaps the original river walls went back to Saxon times,{{sfn|Phillpotts|1999|p=63}} though there is no record of it. Already in 1325 a jury<ref>In that era juries were chosen from local people who were supposed to pool their knowledge of the locality.</ref> — asked about the banks and ditches between [[St Katharine by the Tower]] and Shadwell — said they had been made at some remote period in order to inn 100 acres of marsh.  Further, an ancient custom of Stepney Manor applied.  Tenants had been given land on condition they repaired the walls.  Two "wall reeves" were supposed to inspect and admonish slackers.  Defaulters could be taken to the [[manorial court]] and made to pay triple damages for harm caused ("for every peny three pence").  Despite this the river had broken through the wall again and re-flooded the marsh.{{sfn|Dugdale|1662|pp=69-72}}

In 1350 [[Edward III of England|Edward III]] founded the Abbey of [[Eastminster|St Mary Grace's]] on the eastern side of [[Tower Hill]].  In this desolate area lived nobody but a hermit called John Ingram with some swans.  (He is commemorated in Wapping placenames like Hermitage Wall.) The abbey's [[Cistercians|Cistercian]] monks were skilled in inning and draining marsh.  During the next two hundred years, working eastwards, they inned an unspecified area.{{sfn|Honeybourne|1952|pp=18-22, 24}}

Even so, by the reign of Henry VIII, Wapping Marsh had been "longe tyme surrounded and over flowen with water".  A [[Flemings|Fleming]] named Cornelius Vanderdelf of [[Flemish Brabant|Brabant]] was called in and he inned and recovered the marsh,{{sfn|Galloway|2010|p=9}} described as the area lying between Ratcliff Highway and the Thames, and estimated at 130 acres.{{sfn|Vanderdelf's Act|1536|p=586}}  Today the area between the Highway and the Thames is considerably more than 130 acres: possibly, further land has been reclaimed since Henry's day by a silent process of gradual encroachment.<ref>Seemingly, the only alternative explanation is that the Act of Parliament misdescribed the acreage, or the bounds.</ref>

<gallery mode="packed" heights=400px>
File:Port of London in 1661.jpg|'''Port of London by 1660'''.  Ribbon development along wall; cattle graze on Wapping Marsh, by now inned.  (Base map by Fairthorne and Newcourt, an early quasi-realistic map of the region)
</gallery>

Still there were breaches, until at last, in 1575, the Commissioners of Sewers hit on the solution of encouraging men to build houses on top of the wall itself,{{sfn|Baker|1998|pp=1-7}}{{sfn|Anderson|1787|p=75}}{{sfn|Maitland|1756|p=1366}} after which it was so well maintained that no more breaches are heard of.<ref>None are mentioned in Dugdale or any other source cited in this article.  Floods continued to occur but those were abnormally high tides, not breaches.</ref>

Placenames reminiscent of the inning of Wapping Marsh — like Wapping ''Wall'', Green ''Bank''{{sfn|Baker|1998|pp=1-7}} and Prusoms ''Island'',{{sfn|Johnson|1995|p=31 n.7}} — exist to this day.  Marsh drainage needed cross walls, and these included ''Old Gravel Lane'' [now Wapping Lane] and ''New Gravel Lane'' [Garnet Street], "wherein Carts laden with Gravel from neighbouring Fields used to pass to the River Thames, where it was employed in [[sailing ballast|ballasting]] of Ships".{{sfn|Maitland|1756|p=1380}}

====The port====
As England's maritime industry developed the wall was soon enwharfed.{{sfn|Baker|1998|pp=1-7}}  "As houses spread eastwards along the line of the river walls, wharves extended along the waterfront, claiming land from the river with dumps of crushed brick, crushed chalk from the lime kilns, clay, gravel and silt, laid directly on the river silts behind timber revetments".{{sfn|Phillpotts|1999|p=66}}  Already in 1598, Elizabethan historian [[John Stow]] could write:
{{quote|... from this Precinct of Saint Kathren, to Wapping in the Wose, and Wapping it selfe, (the vsuall place of Execution for the hanging of Pyrates and sea Rouers, at the lowe water marke, and there to remaine, till thrée Tydes had ouerflowed them) and neuer a house standing within these fortie yeares, but is now made a continuall stréete, or ra∣ther a filthy straight [open] passage, with Lanes and Allyes, of small Tenements inhabited by Saylors, and Uictuallers, along by the Riuer of Thames, almost to Radliffe, a good myle from the Tower.{{sfn|Stow|1598|p=347}}}}

By 1600 [[ribbon development]] stretched virtually unbroken along the shore from the City to Limehouse.{{sfn|Johnson|1995|p=17}}

In the Stuart era the government of [[Charles I of England|Charles I]], short of money, thought of a scheme for making some.  His [[Attorney-General]] started legal proceedings against people who owned houses built on top of the wall, saying they were trespassers.  He asked for a court order to demolish the buildings, unless occupants paid rent to the government.  He claimed the Thames was an arm of the sea and a navigable royal port, and that the king owned the soil of the river between the high and low water marks, and
{{quote|all walls, banks, and common sewers leading along by the soil of the said river from Hermitage Wharf to Dickeshore [Duke Shore]{{sfn|Phillpotts|1999|p=65}} in Limehouse; that the defendants had intruded on it by building wharves, houses, and docks on the shore, which belonged to the Crown, and were a nuisance to the river.{{sfn|Moore|1888|pp=261-2}} }}  Since these houses had stood there for many years — had been officially encouraged — this claim was unlikely to appeal to a jury, but the government's lawyers found ways of avoiding a jury trial.  Judges who disliked the government's legal case were pressured or dismissed.  This sort of royal claim, repeated in other parts of the country, caused such resentment that it was mentioned in the [[Grand Remonstrance]], leading up to the [[English Civil War]].{{sfn|Moore|1888|pp=261-278, 281, 310}}

After the [[Great Fire of London|Great Fire]], London's building regulations required houses to be made of brick.  But this area was declared exempt, because "it was believed they could not be built upon timber staves driven into the Thames mud".{{sfn|Pearson|2017|p=74}}  The result was described by Robin Pearson in ''Insuring the Industrial Revolution'':
{{quote|Dwellings, workshops and warehouses were thrown up rapidly, wiith little regard to the quality or materials of construction or the goods and manufacturing processes they contained.  They were squeezed between wharves, rope walks, tar and pitch boilers, sail cloth and turpentine factories, timber yards, cooperages and small docks along the lanes and alleys of St Katherine's, Wapping, Shadwell, Ratcliffe and Limehouse ...  This became notorious to [[Underwriting#Insurance underwriting|underwriters]] as the 'waterside district'.}}By the 1760s some fire offices refused to insure anything within 100 yards of the river wall, or they quoted punitive premiums.{{sfn|Pearson|2017|pp=74-6}}  Boiling pitch and a [[saltpetre]] warehouse set off the great fire of Ratcliff (1794) which burnt over 600 houses.  Wapping had 13 big fires, more than any other place in England.{{sfn|Gariroch|2016|loc=IV}}  Fire itself cured the problem, however, by gradually clearing out the risky premises.{{sfn|Pearson|2017|pp=74-6}}

<center>'''Gallery: Riverside pubs and their walls''' (''The Art Journal'', 1890)</center>
<gallery mode="packed" heights=330px>
File:"The Turk's Head". Wapping.jpg|"The Turk's Head". Wapping
File:"The Prospect of Whitby", Shadwell.jpg|"[[Prospect of Whitby|The Prospect of Whitby]]", Shadwell<ref>Title of engraving in the cited source.</ref>
File:"The Two Brewers", Limehouse.jpg|"The Two Brewers", Limehouse
</gallery>

====Wapping inundations====
The reclaimed area lay below high water mark, so nothing but the wall stopped it from being overflowed twice a day.{{sfn|Buss|1879|336}}  But freak tides could surmount it, and during the 19th century did so with increasing frequency.

In 1834 a tide higher than had been known for 40 years did great damage not only in Wapping but in Shadwell, [[Blackwall, London|Blackwall]], [[Rotherhithe]] and [[Blackfriars, London|Blackfriars]].  The next year a storm surge made for a tide that overflowed Wapping High Street, down which a [[wherry]] navigated.  In October 1841 something unusual was foreseen when the [[ebb tide]] was so low it grounded steamers in the Thames and made the river fordable.  Then, at high tide it flowed into a hundred Wapping streets, flooding the cellars and shops and driving the inhabitants to the upper floors.{{sfn|Parliamentary Gazetteer|1847|p=300}}

According to the Rector of Wapping, in 1874 and 1875, boats plied up and down the High Street with five feet of water beneath.

{{quote|In Hermitage Street, where numbers of the houses have basements below the level of the street, the kitchens, many of them occupied by families, were filled to the ceiling, while the rooms above contained a foot or two of water ...

One was chilled to the bone while visiting the damp and muddy tenements; and the line of water-mark on the walls was visible for months afterwards. {{sfn|Buss|1879|pp=336-7}} }}

====Archaeological finds====
In 2005 a team of archaeologists reported an excavation of a site behind the wall at Narrow Street, Limehouse.  Finds — including a range of imported fine pottery "unprecedented in the United Kingdom" — showed the occupants must have been unusually rich.  "Meals were likely to be served on fine Mediterranean tableware and wine taken in glasses derived from the finest production centres of the age".  They realised the 17th-century occupants had been retired pirates of the Caribbean, whom they were able to identify by name.{{sfn|Killock|Meddens|2005|pp=1, 16, 24}}

===Isle of Dogs===
[[File:Hogarth the idle 'prentice.jpg|thumb|upright=1.4|'''Four windmills and a pirate hanged in chains''' on the west or  ''Mill'' Wall of the Isle of Dogs, seen from Limehouse Reach ([[William Hogarth]]: British Museum.  For narrative, click on 'More details')]]
[[File:The Mill Wall, Isle of Dogs, seen from Greenwich, c.1685.jpg|thumb|upright=1.4|'''The Mill Wall seen from Greenwich''', c.1685 (British School, detail: Royal Collections Trust)]]

The Isle of Dogs — in reality, a [[peninsula]] formed by a [[meander]] in the Thames — was originally a marsh, several feet under water at high tide.  At some period, probably in the Middle Ages, it was inned and drained.  Given over to cattle and sheep, it was described as the richest pasture in England.{{sfn|Walford|1884|p=538}}  The animals grazed below high water level, defended by the river wall (see title image).  Since it was part of the medieval [[Stepney (parish)|parish of Stepney]] the area was better known as Stepney Marsh.<ref>Initially, "Isle of Dogs" may have referred just to the southern tip of the peninsula, or even an islet not yet joined to it: {{harvnb|Walford|1884|p=537}}.</ref>  A solitary chapel, later a farmhouse, was the only building.  The district kept its pastoral character until mid-Victorian times.{{sfn|Hobhouse|1994|pp=375-387}}{{sfn|Walford|1884|p=538}}

The western wall was exposed to brisk winds.  Some seven corn-grinding windmills were built atop it to take advantage of these.  It came to be known as [[Millwall]]: at one time the Isle of Dogs itself was better known by that name.  Pirates were sometimes [[gibbeted]] or hanged in chains on the walls, a warning to passing shipping.{{sfn|Hobhouse|1994|pp=375-387}}

People standing on the Greenwich bank of the river, gazing across at the Isle of Dogs, could see a curious phenomenon.  Normally, the cattle on the Isle of Dogs were not visible, because they were grazing behind the walls.  But sometimes, as the tide rose, the animals seemed to float up into plain view.  Some thought the Isle of Dogs itself was rising on the tide.  Scientists, like [[Edmund Halley]] and [[Charles Hutton]], explained it as a [[mirage]] — caused by moisture altering the [[refractivity]] of the atmosphere.{{sfn|Hutton|1815|p=304}}  The cattle vanished from sight as the tide fell again.

On 25 March 1448, owing to the fault of one "John Harpour, gentleman", who did not repair his bank opposite to [[Deptford Strond]], the violence of tides made a 100-yard<ref>"xx [20] rods".</ref> breach, drowning 1,000 acres of land.<ref>More than the area of the Isle of Dogs.</ref> So held the jury.{{sfn|Dugdale|1662|p=72}}  The land was under the tides for 40 years.{{sfn|Croot|1997|p=9}}  Breaches occurred elsewhere at other times.

====The great breach, or Poplar Gut====
Poplar Gut was a part-severance of the neck of the Isle of Dogs.  But for river wall maintenance it might have been complete.

A classic fate of geological formations like the Isle of Dogs is [[meander cutoff]], when the river takes a short-cut across the neck of land; the old bend is left as an [[oxbow lake]].  A question is why this did not happen to the Isle of Dogs, turning Greenwich and Deptford into mere lakeside hamlets.

Samuel Pepys' diary for 23 March 1660 recorded
{{quote|[In the Isle of Dogs] we saw the great breach which the late high water had made, to the loss of many thousand pounds to the people about Limehouse.}} The great breach Pepys saw was in the west wall.  It was brought about by ballast-digging on the foreshore.{{sfn|Hobhouse|1994|pp=375-387}}{{sfn|Johnson|1995|p=26 }} By the time it could be attended to, the incoming tides had scoured out a permanent lake extending a fair way across the neck of the peninsula.  (Possibly there was a line of weakness there all along.  A map of 1593 shows a small stream cutting off the meander entirely, more or less where the great breach later developed.{{sfn|Walford|1884|p=536}})

In Gascoyne's map of 1703 the lake was called ''The Breach'' (in later maps, ''Poplar Gut'').<ref>Not to be confused with Poplar ''Cut'', another name for the [[Limehouse Cut]].</ref> About 5 acres in extent,{{sfn|Johnson|1995|p=26}}  people fished in it from boats.  Hundreds of East Londoners went swimming there on summer mornings.{{sfn|Stock|1857|p=183}}  The area between the Thames and the lake is marked ''Old Breach'', a placename suggesting it had happened there before.  A 'horse-shoe" wall is inset around it; this was typical{{sfn|Galloway|2013|p=6}} when a breach in the original wall was too difficult to repair.  The resulting riverside space (or ''Forland'') was used for the wet storage of timber.  The river wall was 15 foot high and 18 feet across at its top, wider at its base.{{sfn|Johnson|1995|p=26}}

Poplar Gut was a prominent feature until 1800, when it was absorbed by the new [[West India Docks]].{{sfn|Walford|1884|pp=540-1}}  Today the site is part of the  Middle Dock ornamental feature in the [[Canary Wharf]] financial district.

<gallery mode="packed" heights=145px>
File:Gascoyne Hamlet of Popler.jpg|'''1'''
File:Poplar Gut 1703.jpg|'''2'''
File:John Fairburn 7.5. 1800.jpg|'''3'''
File:Canary Wharf from Limehouse London June 2016 HDR.jpg|'''4'''
</gallery>

# '''Isle of Dogs, 1703''' showing the walls and (red arrows) the Foreland and Poplar Gut.  The Foreland is one of the two prominent "horseshoes" made where the original bank could not be repaired.  (Joel Gascoyne, Strype's 1735 reduction: East London History Society)
# '''Closeup detail''' (from Gascoyne's ''An Actuall Survey of the Parish of St Dunstan Stepney alias Stebunheath'', 1703)
# '''The fate of Poplar Gut''', 1800, absorbed by the new West India Docks (red arrows).  (John Fairburn: British Library)
# '''Today'''. Canary Wharf, London's second financial district, Isle of Dogs.

[[Samuel Smiles]] thought human intervention — specifically, river wall maintenance — preserved the meander at the Isle of Dogs, because the authorities had an incentive to sustain the royal dockyard at Deptford.{{sfn|Smiles|1861|p=69}}

===Stopping Dagenham Breach===
[[File:Perry title page.jpg|thumb|'''Captain Perry's book''' (1721) the first English work on civil engineering]]

Dagenham Breach was a break in the river wall through which the tides scoured out a large, permanent lake and flooded extensive lands.  The scooped out sands threatened to block the navigation of the Thames itself.  It took 12 or 14 years<ref>12 to plug the breach and 2 to remove the [[shoal]] in the river.</ref> to fix — at ruinous expense.  It was finally repaired by retired naval captain John Perry.{{sfn|Hamilton|1949|pp=245, 249}}  Perry left a written account, described as probably the earliest work on civil engineering in England.{{sfn|Downing|1864|p=59}}

The background was that, south of the village of [[Dagenham]] and the manor of [[Royal Liberty of Havering|Havering]], there was the usual Thames marsh.  At some period in the Middle Ages it had been inned, perhaps by [[Barking Abbey]].  Commissioners of Sewers were responsible for the Dagenham and Havering levels.  In 1594 the commissioners ordered the [[River Beam]] to be inned, not for the first time.  The Beam was breached again in 1621 and was repaired by Sir [[Cornelius Vermuyden]].  This left two interconnected creeks forming a rough U.{{sfn|Powell|1966|pp=281-294}}

On 29 October 1707 a great tide tore a 14-foot gap through the wall.  According to Captain Perry this was because the sluice — a hollow tree trunk{{sfn|Grieve|1959|p=26}} — was defective: it "blew up".  The conservative English used wooden sluices, which eventually rotted; badly made too, wrote Perry, unlike the Dutch who made them from stone lined with "tarras" (tar).{{sfn|Perry|1721|pp=10-12}}

The breach could easily have been stopped quickly: by setting back a small clay "horseshoe".{{sfn|Perry|1721|p=5}} But "it was nobody's business to act first".{{sfn|Hamilton|1949|p=245}}  Successive tides continued to pour back and forth, widening the gap, gathering strength, cutting a channel through the clay and getting down to the sand and gravel strata, at which the scouring became so rapid the rush was overwhelming.  The waters made a 100 foot gap{{sfn|Smiles|1861|p= 71}} and scoured out an inland lake — really, a tidal river — 1 {{frac|1|2}} miles long and 20–40 feet deep.{{sfn|Downing|1864|p=31}} In a fortnight 1,000 acres had been flooded.{{sfn|Powell|1966|pp=281-294}}

Three separate efforts were made to fix the breach.  Each had to confront the same engineering difficulty: four<ref>In, and out, at each tide.</ref> times a day, thousands of tons of water were going to rush through that gap, if they could.

The landowners' attempt was the earliest.  Their method was to narrow the channel, by building a timber work inwards on each side <ref>At point '''C''' in the map.</ref>  Then, they would wait for a [[neap tide]] and suddenly plug the gap by sinking derelict ships, baskets of chalk, clay and so forth.  The general principle was sound, and has been used since.  But they failed to appreciate that water under pressure will always find any crack, however small, leak through it, and bore it out.  A torrent developed.  The ships — including an old man o' war — were literally blown away.  The breach was worse than before.{{sfn|Downing|1864|p=31}} The landowners had spent more than the value of their lands.{{sfn|Hamilton|1949|p=246}}

<gallery mode="packed" heights=270px>
File:Dagenham Breach map.jpg|'''1'''
File:Perry's dovetailed piles.png|'''2'''
File:Dagenham Lake.jpg|'''3'''
</gallery>

# '''A map of Dagenham Breach'''.  Tidal waters scoured out a permanent lake.  The pink area was flooded at high water.  The channel on the right was an old breach, fixed by Vermuyden in 1621.  (Notice, unrelated to Dagenham Breach, two typical repair "horseshoes" marked {{color|red|'''U'''}}.{{sfn|Galloway|2013|p= }}) 
# '''Captain Perry's dovetailed piles''' (plan view), used to close the gap by building a dam across point A in the map.
# '''Dagenham Lake''', from a Victorian engraving.  Thames shipping passes on the other side of the repaired wall.

According to the Victoria County History,

{{quote|Dagenham Breach had now become a matter of national importance. The tides flowing in and out of it had built up a huge sandbank in the Thames, opposite the mouth of the breach, which threatened to bring shipping to a standstill. It was also clear that the mending of the breach was now beyond local resources.}}

A special Act of Parliament was passed.  Money was raised by a levy on shipping.  Tenders were invited for a contract to fix Dagenham Breach at public expense.  The winner was one William Boswell, who in 1714 agreed to do the job for a success fee of £16,300{{sfn|Powell|1966|pp=281-294}} (about £3 million today).  Boswell employed an improved version of the landowners' method.  Instead of sinking miscellaneous ships, he used mathematically regular chests weighted with stones.  Furthermore the chests had internal doors to allow the tide to ebb and flow freely while the spaces between were being sealed.  Only when sealed would the doors be shut.  Despite all his efforts Boswell failed for, no matter what he did, he could never get his chests flush with bed of the channel.{{sfn|Downing|1864|p=31}}

A further tender was invited, which was won by Captain Perry.  A lone wolf, he had been court-martialled and jailed for surrendering his ship too easily to the French, but afterwards pardoned. Perry agreed to fix the breach for £25,000.{{sfn|Hamilton|1949|pp=253, 241-2 246}}  He adopted two simultaneous principles:

* He would close the channel by driving a row of piles into its bed to create a dam.  Formed with [[dovetails]] (as in image '''2'''), the piles would interfit, hence be watertight.  To reduce the water pressure on them, the piles would be no taller than was required to close the channel at neap tides.  Hence there would be time to rebuild the clay river wall before the next spring tide.
[[File:1790 Dagenham Beach House.jpg|thumb|upright=1.3|'''Dagenham Beach House''' in 1790, a prestigious lodge for anglers, with traces of Perry's remedial works (Valence House Museum)]]
* But, to further reduce the water pressure his pile dam would have to bear, Perry would make extra apertures through the river wall.  Fitted with sluices, they would allow the tide to continue to ebb and flow, finally being closed only when Dagenham Breach had been plugged.{{sfn|Downing|1864|pp=31-2}}

Beset with difficulties, including suppliers who sold him defective clay, a nightwatchman who failed to warn him about an extra-high tide, strikes, and cashflow problems, Perry eventually succeeded, finally plugging the gap on 18 June 1719. He got his success fee, but he was a ruined man.  Parliament voted him an extra reward.{{sfn|Hamilton|1949|pp=247-9}}

The lake remained, as did Captain Perry's house, called Dagenham ''Beach'' House.  It was popular with anglers.  Cabinet ministers went there annually for fish dinners.  Later, the lake was made into [[Dagenham Dock]].  The Ford Motor Company built its Dagenham works to take advantage of it.  Parts of it remain to this day.{{sfn|Powell|1966|pp=281-294}}

===The Erith explosion===
Early in the morning of 1 October 1864 a blast was heard all over London and up to 100 miles away.  A gunpowder barge moored near Erith, Kent had ignited, setting off two landward powder magazines: the resulting chain explosion consumed 46 {{frac|1|2}} tons of gunpowder and blew the river wall into the Thames.{{sfn|Moore|1865|p=185}}

Fortunately it was low tide, but Lewis Moore, an engineer who chanced to live nearby, realised the gap must be plugged before the tide rose — high water was due at 1:30&nbsp;p.m.  A calamity was impending, worse than Poplar Gut or Dagenham Breach, for the gap was 110 feet long exposing the whole of the country to the rising tide. {{quote|The extent of land positively imperilled would be about 4,000 acres, and should it have passed Woolwich and Greenwich by the large sewer [Bazalgette's Low Level Sewer, which went as far west as Putney],{{sfn|Bazalgette|1865|p=29}} it might have done immense damage; the whole of the southern and eastern side of London being more or less below the level of high water.}}
He called for help from [[navvies]] building [[Crossness Pumping Station]] and the garrison at the [[Royal Arsenal|Woolwich Arsenal]].  Racing against the tide, they improvised impermeable [[Puddling (civil engineering)|puddled clay]] to fill the gap and earth-filled artillery sandbags to back it up.  If the explosion had occurred even one hour later it would have been impossible to staunch the flow.{{sfn|Moore|1865|pp=185-8}}

<gallery mode="packed" heights="260px">
File:Erith explosion 1.jpg|'''1. Racing against the tide''' (''Illustrated London News'', 8 October 1864)
File:Erith explosion 2.jpg|'''2. Consolidating the wall''' (''Illustrated London News'', 15 October 1864)
</gallery>

#  As the tide rises, workmen race to plug the breach with improvised puddled clay and sandbags
#  Having succeeded against the odds, relief shifts have time to restore the river wall

This was not the first time the wall had collapsed.  In 1527, half a mile away, the river had irrupted and drowned the land for 63 years; it had to be reclaimed piecemeal by inning.{{sfn|Moore|1865|pp=188-9}}

==London parliamentary embankments==
Some embankments were explicitly authorised by Parliament.  These were not intended as flood defences, primarily.

===17th century===
The first of these was for providing a road beside the river.   Called the Forty-foot way, it was proposed by Sir Christopher Wren as part of the rebuilding of London after the Great Fire.  The bank between the Tower and the [[Temple, London|Temple]] was to be kept clear of buildings for a distance of 40 feet.  An Act of Parliament was passed to that effect.  However, the prohibition was ineffective.  There were so many building encroachments that the Act became a dead letter, and was eventually repealed.{{sfn|Walker|1842|p=530}}

===18th century===
The first public works embankment was made by [[Robert Mylne (architect)|Robert Mylne]] in 1767 in connection with the building of [[Blackfriars Bridge]]. Half a mile long, it started at Paul's Wharf and went in a smooth line to the Temple, fronting its riverside gardens.  It was not a road, but a straightening of the river bank. Its purpose was to prevent the accumulation of malodorous silt.{{sfn|Walker|1842|p=530}}

In 1770, at a site that is today behind [[Victoria Embankment Gardens]], but then was under the waters of the Thames, the [[Robert Adam|Adam brothers]] laid a foundation that protruded 100 feet into the stream.{{sfn|Walker|1842|p=530}}  According to social campaigner [[Granville Sharp]], they did it by illegally and furtively dumping rubbish into the river until they got a firm surface.{{sfn|Sharp|1771|pp=iii, vii-viii, x, xvi}} On this foundation they built a quay with archways, and the prestigious [[Adelphi Terrace]] above and behind.  Strenuously opposed by the [[Corporation of London]], the brothers managed to get an Act of Parliament to authorise their reckless{{sfn|Gater|Wheeler|1937|pp=99-102|ps=.  The brothers started building landside without even signing a contract with the freeholder.  The project lost heavily.  The Adams avoided bankruptcy by running a lottery; prizes were houses in the Adelphi. To authorise this they needed — and got — another Act of Parliament.}} [[fait accompli]].{{sfn|Walker|1842|p=530}}

<center>'''The Adam brothers' encroachment'''</center>

<gallery mode="packed" heights=280px>
File:Pastorini's Adelphi.jpg|'''1.  The quay'''
File:The Adelphi Terrace in 1795.jpg|'''2.  The terrace upstairs'''
</gallery>

#  "View of the South Front of the New Buildings called Adelphi, formerly Durham Yard and that part of the Cities of London and Westminster", 1770 (Benedetto Pastorini: Yale Center for British Art).  Today, the bank of Thames has moved 150 yards to the right.
#  "Adelphi Terrace", 1795 (unknown artist: YCBA).  Fashionably dressed people, [[neoclassical architecture|neoclassical]] terrace, downstairs a bustling quay handles commercial traffic.

In 1777 funds were authorised to make a horse-towing path above Fulham.{{sfn|Walker|1842|p=535}}

===19th century===
[[File:Millbank Penitentiary 1829.jpg|thumb|upright=1.4|'''Millbank embankment'''.  Heavy goods traffic passes the Penitentiary (today, site of [[Tate Britain]].  The Thames is behind you. Notice the men with crowbars.  (Shepherd and Tingle, pub. 1829: British Museum)]]
[[File:Frederick Brown An impromptu dance - a scene on the Chelsea Embankment 1883.jpg|thumb|upright=1.4|'''A scene on the Chelsea Embankment''', 1883 ([[Frederick Brown (artist)|Frederick Brown]]: Bonhams)]]

In 1817 Parliament authorised a road to be made along the bank from Westminster to the newly erected [[Millbank Penitentiary]], going through land of the [[Robert Grosvenor, 1st Marquess of Westminster|Earl Grosvenor]].{{sfn|Raithby|1819|p=95|ps=.  Note page 98, first line.}} Intended to bear heavy traffic, it was embanked over 1,500 feet by Sir [[Robert Smirke (architect)|Robert Smirke]].{{sfn|Redman|1878|p=33}}

After the old [[Houses of Parliament]] burnt down in 1834 they were rebuilt under Sir [[Charles Barry]].  As the first step, a new Palace of Westminster embankment was made by constructing a coffer dam and infilling back to the existing river wall.{{sfn|Dalrymple|1840|pp=18-19}}  1,200 feet long, it was engineered by Robert Walker (1840).{{sfn|Redman|1878|p=33}}{{sfn|Walker|1842|p=605}}

Apart from miscellaneous works in the London docks and Greenwich Hospital (but these totalled more than 9 miles),{{sfn|Redman|1878|pp=33-34}} no significant parliamentary embankments were sanctioned until the 1860s.  There was much prevarication, and opposition by vested interests.  A sanitary crisis and the urgent need to build a strategic low-level sewer somewhere along the north bank of the Thames — the only alternative was the congested Strand — stimulated the decision to authorise the first of these, the Victoria Embankment.{{sfn|Bazalgette|1878|p=3}}
{{main|Victoria Embankment}}
{{main|Albert Embankment}}
{{main|Chelsea Embankment}}
Executed for the Metropolitan Board of Works (chief engineer Sir Joseph Bazalgette), the total extent of these mid-Victorian embankments was about 3 {{frac|1|2}} miles.{{sfn|Bazalgette|1878|p=4}} Bazalgette's embankments were not built for the purpose of flood defence, though they might have performed that function incidentally.  (The Thames in central London had defensive walls already.)<ref>See e.g. {{harvnb|Bazalgette|1878|p=9}}.</ref> Their purpose was to provide much needed public roads and open spaces, and to achieve a more uniform width.{{sfn|Richardson|1877|pp=165, 173-4}}{{sfn|Roche|1877|pp=131, 195-6}}{{sfn|Bazalgette|1877|pp=23-4}}  Owing to encroachments over many years, in one place the river was three times as narrow as in another. In the wide places, reduced flow caused mud to accumulate — "in a state of constant fermentation".{{sfn|Walker|1842|p=605-6, 610}}

===20th century===
The last large new embankment in London was made in 1951 in connection with the Festival of Britain (see South Bank, above).

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==External links==
*[https://archive.org/details/anaccountstoppi00perrgoog/page/n6/mode/2up ''An Account of the Stopping of Daggenham Breach'' in Captain John Perry's own words]
*[https://archaeologydataservice.ac.uk/archiveDS/archiveDownload?t=arch-1132-1/dissemination/pdf/042/042_269_302.pdf Spurell's ''Early Sites and Embankments on the Margins of the Thames Estuary'']






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