Resilience measure: Bypass channel


Bypass channel, also known as a flood-relief channel, is an artificially made waterway constructed in order to protect urban and rural agricultural areas from flooding. It is built to carry excess water from a main stream or river so that it is translocated into the lower parts of the same stream or into another stream with the ability to accept a large amount of excess water. There are two types of bypass channels with regards to placement: parallel and transverse (vertical). The most common case of a parallel bypass channel is the one starting from the main river before the flood-prone section and reunited with the river after that section. In lowland areas, the construction of bypass channels is often combined with the construction of retention areas (Ahmad P. and Rasool S., 2014, p. 304).

Co-benefits and impacts

Apart from enhancing the rivers' capacity, many secondary benefits are produced such as increasing groundwater infiltration, improving water quality, restoring natural floodplain forming processes (e.g., sediment transport and deposition) and improving fish and wildlife habitats.
(FEMA, Floodplain Natural Resources and Functions, accessed on Sept. 2016)

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Last modified: Sept. 21, 2016, 7:58 a.m.