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Sizing a riprap basin for oversized box culvert outfall

Sizing a riprap basin for oversized box culvert outfall

Sizing a riprap basin for oversized box culvert outfall

(OP)
I am trying to find some reference material regarding the sizing of riprap outfall basins for larger diameter outfall culverts. The only references I can find provide sizing tables for pipes with diameters up to 96". However, due to lack of significant head on the lake outfall structure, the outfall culvert has to be a box that has a greater outfall orifice area. The velocities coming out of the culvert are low enough to allow for a riprap outfall, but I just can't find any materials that would detail how to size the basin. Any suggestions are greatly appreciated.

RE: Sizing a riprap basin for oversized box culvert outfall

The PA Erosion and Sediment Pollution Control Manual available here:

http://www.dep.state.pa.us/dep/deputate/watermgt/w...

on pages 119-121 gives the equations in terms of D, so you can just  use Deq of a rectangle =2L1L2/(L1+L2) to get D.

This will pass in PA, USA, so run it by the local reviewer first.

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