Clogging in detention pond outfall
Clogging in detention pond outfall
(OP)
When designing the outfall structure for a large detention pond should I take clogging into account?
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Clogging in detention pond outfall
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RE: Clogging in detention pond outfall
RE: Clogging in detention pond outfall
RE: Clogging in detention pond outfall
Take clogging into account by designing the facility to trap sediment and flotables upstream of the outlet structure rather than in the pipe/orifice/weir/restrictor that forms the hydraulic control for the facility. In many cases you can use a submerged pipe or orifice upstream of the restrictor that will trap flotables at the water surface, and provide a sump for sediment. In a few cases I've seen a floating boom used to trap flotables; this makes sense if the restrictor is an open-channel device like a weir or flume.
With these clog-prevention design elements included, I would not include clogging when performing hydraulic calculations to size the flow restrictor, so long as an overflow is provided as noted by Terryscan.