Lesson Media Objects
Erosion Control Measures
ECM of Urban Land - Impoundments and Wetlands
Impoundments are man-made ponds or lakes constructed to control storm run-off and/or trap sediments. Before soil or sediment reach the drainage system, detention ponds can be placed to trap and settle sediments. This in effect is NOT an erosion preventive measure but a measure to minimize the already detached or eroded soil from entering waterways. It is a sediment control measure.
There are two kinds of impoundments: permanent ones called retention ponds and temporary ones called detention ponds.
Wetlands are areas that are frequently saturated by surface water or groundwater, staying wet at least part of the year (i.e., swamps, bogs, fens, marshes, and estuaries). Wetlands are often natural but can also be constructed. Wetlands are effective at controlling sediment and filtering nutrients and other chemical pollutants because they are a biologically active system.
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