the cattails and other tall, thick grass surrounding natural water features. Proper depth of retention ponds is important for removal of pollutants and maintenance of fish populations. Urban fishing continues to be one of the fastest growing fishing segments as new suburban neighborhoods are built around these aquatic areas. Other meanings A retention basin can also be a part of a nuclear reactor used to contain a core meltdown. See also Balancing lake (UK) Nationwide Urban Runoff Program (NURP) – US stormwater research project Settling basin – for treating agricultural and industrial wastewater Stream restoration Surface runoff Sustainable drainage system Urban runoff Water pollution References External links Virginia retention basin standards Detention vs. retention – Harris County, Texas Flood Control District Stormwater Ecological Enhancement Project – University of Florida The use of retention ponds in residential settings International Stormwater BMP Database – Performance Data on Urban Stormwater BMPs Environmental engineering Hydraulic engineering Hydrology Infrastructure Stormwater management