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===Outlet===
===Outlet===
+http://www.iowastormwater.org/documents/filelibrary/files/infiltration_bmps/Outlet_Structures_48B13497A39A1.pdf
+
Detention time
Detention time
A detention time of 24 hours should be targeted in all instances. Where this necessaitates a very low outflow, a [[Flow control#Vortex valve|vortex valve]] or similar is recommended over an orifice or pipe restiction. The detention time is approximated by the drawdown time.
A detention time of 24 hours should be targeted in all instances. Where this necessaitates a very low outflow, a [[Flow control#Vortex valve|vortex valve]] or similar is recommended over an orifice or pipe restiction. The detention time is approximated by the drawdown time.
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===Excess flow control===
===Excess flow control===
{{:flow through riser}}
{{:flow through riser}}
+https://www.fhwa.dot.gov/engineering/hydraulics/software/hy8/
https://www.hydrologystudio.com/no-fail-detention-pond-design/
https://www.hydrologystudio.com/no-fail-detention-pond-design/