FOR the Inland Navigation Section of the Sixteenth International Congress of Navigation, Brussels, 1935, Dr. Brysson Cunningham prepared a report on “The Estuarial Embankments of the River Thames”. Of the origins of these walls little is definitely known and, in his “History of the Port of London”, Sir Joseph Broodbank inclines to the view that their construction was a gradual and piecemeal process undertaken locally with the purpose of reclaiming for agriculture the valuable lands along the banks of the river, and probably initiated by immigrants from Flanders familiar with work of this kind. As he also says, “The builders in carrying out their object would not trouble themselves as to the effect their work had on the stream nor did they realise that they were, in fact, performing a mighty service in providing for London one of its greatest assets as a Port”. Records of repairs and alterations have been traced back to the time of Edward II, and about that time Commissions of Sewers using the word in its original sense began to be appointed to exercise jurisdiction in several localities. Until 1930, when the Land Drainage Act established Catchment and Drainage Boards to take over their duties, these Commissions acted under the authority of an Act of 1531 to protect the lands from being flooded either by inundation or accumulation of superfluous waters. As consultant engineer to two of these bodies entrusted with portions of the Thames Embankments, Dr. Brysson Cunningham was able to advise the Congress as to the nature of the problems presented, and gave an account of the construction, maintenance, repair and renewal of these walls. Altogether, the earthworks on both sides of the river below London Bridge have a total length of approximately 120 miles and give protection to 64 square miles of low-lying marshland. Being 4-5 feet above Ordnance Datum while H.W.O.S.T. level is 10-13 feet, these extensive lands would, without protection, become permanently flooded. In the report, the several inimical agencies are described and, by maps, sections and diagrams, the methods and materials used to ensure adequate defence are fully exhibited.
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