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BMP Fact Sheet<br />

Detention Basins<br />

Detention basins are temporary stormwater storage<br />

structures that help prevent downstream flooding. The<br />

primary purpose of detention basins is the attenuation<br />

of stormwater runoff peaks.<br />

Detention basin with a no mow buffer in West Bloomfield<br />

Township, MI<br />

Source: Hubbell, Roth, & Clark<br />

Applications<br />

Residential Yes<br />

Commercial Yes<br />

Ultra Urban Yes<br />

Industrial Yes<br />

Retrofit Yes<br />

Highway/Road Yes<br />

Recreational Yes<br />

Variations<br />

• Dry ponds<br />

• Wet ponds<br />

• Underground detention<br />

• Constructed wetlands<br />

• Bioretention<br />

Key Design<br />

Features<br />

• Storage capacity highly dependent on available site<br />

area<br />

• Outlet structure configuration determines peak rate<br />

reduction effectiveness<br />

• Can be used in combination with other BMPs<br />

• Regular maintenance of vegetation and sediment<br />

removal required<br />

• Natural high groundwater table required <strong>for</strong> wet<br />

ponds and constructed wetlands<br />

• Relatively impermeable soils or impermeable liner<br />

• Forebay <strong>for</strong> sediment collection and removal<br />

• Dewatering mechanism required <strong>for</strong> wet ponds and<br />

constructed wetlands<br />

• Stabilized emergency overflow and energy dissipation<br />

at all outlets<br />

Stormwater Quantity Functions<br />

Volume <strong>Low</strong><br />

Groundwater<br />

Recharge<br />

None or <strong>Low</strong><br />

Peak Rate High<br />

Stormwater Quality Functions<br />

Varies by type as follows:<br />

Type TSS TP TN Temperature<br />

Dry Pond Medium Medium <strong>Low</strong> <strong>Low</strong><br />

Wet Pond High Medium Medium <strong>Low</strong>/Medium<br />

Constructed Wetland High Medium Medium <strong>Low</strong>/Medium<br />

Underground Detention N/A N/A N/A N/A<br />

LID <strong>Manual</strong> <strong>for</strong> <strong>Michigan</strong> – Chapter 7 Page 169

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