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Phase 1, the creation of 109.4 miles (176.1 km) of drainage tunnels ranging from 9 to 33 feet (2.7 to 10.1 m) in diameter, up to 350 feet (110 m) underground, was adopted in 1972, commenced in 1975, and completed and operational by 2006. Phase 2, creation of reservoirs primarily intended for flood control, remains underway with an expected ...
Stormwater, also written storm water, is water that originates from precipitation (storm), including heavy rain and meltwater from hail and snow. Stormwater can soak into the soil (infiltrate) and become groundwater, be stored on depressed land surface in ponds and puddles, evaporate back into the atmosphere, or contribute to surface runoff.
Storm drain grate on a street in Warsaw, Poland Storm drain with its pipe visible beneath it due to construction work. A storm drain, storm sewer (United Kingdom, U.S. and Canada), highway drain [1], surface water drain/sewer (United Kingdom), or stormwater drain (Australia and New Zealand) is infrastructure designed to drain excess rain and ground water from impervious surfaces such as paved ...
Combined sewer outflow into the Anacostia River in Washington, D.C. Ratcliff Beach CSO discharges into the River Thames in London [7]. These relief structures, called "storm-water regulators" (in American English - or "combined sewer overflows" in British English) are constructed in combined sewer systems to divert flows in excess of the peak design flow of the sewage treatment plant. [6]
A stormwater detention system during installation beneath a parking lot. A stormwater detention vault is an underground structure designed to manage excess stormwater runoff on a developed site, often in an urban setting. This type of best management practice may be selected when there is insufficient space on the site to infiltrate the runoff ...
Bioswale. Runoff from the vicinity flows into an adjacent bioswale. Bioswales are channels designed to concentrate and convey stormwater runoff while removing debris and pollution. Bioswales can also be beneficial in recharging groundwater. Bioswales are typically vegetated, mulched, or xeriscaped. [1] They consist of a swaled drainage course ...
Daylighting (streams) The daylighted Saw Mill River in Getty Square, Yonkers, New York, had been covered by a parking lot. A short stretch of Lower Marin Creek in UC Village in Albany, California has been daylighted. Daylighting is the opening up and restoration of a previously buried watercourse, one which had at some point been diverted below ...
The United States Environmental Protection Agency (EPA) Storm Water Management Model (SWMM) [1][2][3][4][5][6][7][8] is a dynamic rainfall – runoff – subsurface runoff simulation model used for single-event to long-term (continuous) simulation of the surface/subsurface hydrology quantity and quality from primarily urban/suburban areas.
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