Resilience measure: Filter trench

definition

Filter trenches are shallow excavations filled with rubble or stone that create temporary subsurface storage of stormwater runoff. These trenches can be used to filter and convey stormwater to downstream SuDS components. Its performance in peak flow reduction is medium and in volume reduction low.
(Susdrain, Filter trench, accessed on Sept. 2016)

Co-benefits and impacts

Water quality treatment is one of filter trench's main advantages. Amenity and ecology potential are additional ones but lower in performance. Filter trench can be incorporated easily into site landscaping and fits well beside roads. This measure is not applicable to fine particled soils such as clay and silts duw to high clogging potential without effective pre-treatment. Some other disadvantages are the build-up of pollution/ blockages which are difficult to see, high historic failure rate due to poor maintenance, wrong siting or high debris input, the high cost of replacing filter material when blockage occur and the fact that this measure is limited to relatively small catchments.
(Susdrain, Filter trench, accessed on Sept. 2016)

Related Links





Time scales (Show all)

Medium term

Synonym of Resilience Measures (Show all)

Infiltration trench

Measure types (Show all)

Environmental

Problem types (Show all)

Pluvial




Last modified: Sept. 21, 2016, 8:26 a.m.