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On a watershed scale, factors contributing to flooding include the total volume of stormwater, the peak flow and the duration of peak flow.
On a watershed scale, factors contributing to flooding include the total volume of stormwater, the peak flow and the duration of peak flow.
All low impact development facilities can help to prevent flooding by providing watershed distributed stormwater storage, and most feature some form of peak flow control device at the outflow or overflow. The limiting factors in the contribution that a system can make to flood control include the total storage and the rate at which the system can be emptied between events.
All low impact development facilities can help to prevent flooding by providing watershed distributed stormwater storage, and most feature some form of peak flow control device at the outflow or [[overflow]]. The limiting factors in the contribution that a system can make to flood control include the total storage and [[drainage time|the rate at which the system can be emptied between events]].
Flow is controlled by:
*the properties of the filter media. See [[flow through filter media]],
*the exfiltration of water from the practice through an [[underdrainin]]. See [[flow through perforated pipe]],
*one or more orifices,
*weirs, or
*proprietary low flow devices.
==Weirs==
https://books.google.ca/books?id=fTQWDQAAQBAJ&dq=Jefferies+Scotland+Swales+2004&source=gbs_navlinks_s
==Low flow devices==
{{:Disclaimer}}
{{:Disclaimer}}
*[http://echelonenvironmental.ca/stormwater/stormwater-flow-control/vortex-valves/ Echelon vortex valves from 0 to 120 L/s]
*[http://echelonenvironmental.ca/stormwater/stormwater-flow-control/vortex-valves/ Echelon vortex valves from 0 to 120 L/s]
*[https://www.hydro-int.com/en/hydro-brake-flow-control-series Hydrobrakes of all sizes, flow control requirements]
*[https://www.hydro-int.com/en/hydro-brake-flow-control-series Hydrobrakes of all sizes, flow control requirements]