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While basic detention ponds are typically designed to empty within 6 to 12 hours after a storm, extended detention (ED) dry basins improve the basic detention design by lengthening the storage time, for example, to 24 or 48 hours. Longer detention allows for more settling of suspended solids, resulting in higher-quality water. [7]
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 or build a surface facility such as a detention basin or retention basin .
A retention basin, sometimes called a retention pond, wet detention basin, or storm water management pond (SWMP), is an artificial pond with vegetation around the perimeter and a permanent pool of water in its design.
Recently completed infiltration basin for stormwater collection. An infiltration basin (or recharge basin) is a form of engineered sump [1] or percolation pond [2] that is used to manage stormwater runoff, prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay.
In the plan, the Ala Wai Golf Course would serve as a floodwater detention basin with an earthen berm built around the course 6 feet to 9 feet tall.
As of June 2013, a total of $1.7 bill was spent on flood control, including construction of 90 detention basins and approximately 581 miles of channels and underground storm drains. To date, 51 square miles have been removed from federally identified FEMA flood zones, saving residents millions of dollars per year in flood insurance premiums.
Sediment basin installed on a construction site.. A sediment basin is a temporary pond built on a construction site to capture eroded or disturbed soil that is washed off during rain storms, and protect the water quality of a nearby stream, river, lake, or bay.
Detention dams are common in flood prone areas for flood control. A detention dam is built at an elevation above the flood prone zone. Flood water collects in the basin above the dam and is released at a flow rate the flood zone and channel can accommodate. Channels can include dikes, canals, streams, drain pipes, and rivers.