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The potential to retrofit sustainable drainage systems to address combined sewer overflow discharges in the T hames T ideway catchment
Author(s) -
Stovin Virginia R.,
Moore Sarah L.,
Wall Matthew,
Ashley Richard M.
Publication year - 2013
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2012.00353.x
Subject(s) - disconnection , drainage basin , combined sewer , environmental science , drainage , retrofitting , engineering , stormwater , geography , ecology , cartography , structural engineering , political science , surface runoff , law , biology
Experience of retrofitting sustainable drainage systems ( SuDS ) in the U nited K ingdom is limited, and there are no well‐established procedures for evaluating the feasibility, value or cost‐effectiveness of doing this, particularly at the catchment scale. This paper demonstrates a two‐phase process for evaluating the potential to retrofit SuDS to address combined sewer discharges in three subcatchments within the T hames T ideway catchment of L ondon. The first phase evaluates what might be achieved with various levels of disconnection (‘global’ disconnection scenarios) using hydraulic models, while the second phase considers how disconnection might practically be achieved. High levels of disconnection are technically possible but practicably difficult. In selected cases, and with aggressive implementation of SuDS , combined sewer overflow CSO discharges could potentially be eliminated or reduced to acceptable levels without the need for any modifications to underground assets. However, retrofit SuDS could not eliminate the requirement for some form of sewer modification in any subcatchments.