Design Flow Rate (rainwater drainage)
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In the context of rainwater drainage, the computation of design flow rate can be categorised into the following:
- Effective plan catchment
- Elevation catchment (for wind driven rain)
Design flow rate (l/s) = Effective Catchment Area (m.sq.) x Rainfall Intensity (mm/hr) / 3600
The method of calculating Effective catchment areas can be referred to LINK Catchment Topic
References:
- BS EN 12056-3:2000
