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[[File:Riser.gif|thumb|A two stage riser with low flow controlled with an orifice and high flow controlled with a weir.]]
[[File:Riser.gif|thumb|500px|A two stage riser with low flow controlled with an orifice and high flow controlled with a weir.]]
There are many configurations for multistage risers according to the flow control requirements.
There are many configurations for multistage risers according to the flow control requirements.
*''A<sub>o</sub>'' = the cross-sectional area of the orifice in m<sup>2</sup>,
*''A<sub>o</sub>'' = the cross-sectional area of the orifice in m<sup>2</sup>,
*}}
*}}
==See also==
*[[Detention basins]]
*[[Flow control]]
==For review==
https://www.hydrologystudio.com/no-fail-detention-pond-design/