The last pipe in my proposed storm sewer network discharges into a detention pond. The pipe is 75' long, at a slope of 18% and discharges into the pond at a velocity of 8 fps. IS this too steep to construct? Will erosion be a problem? Would I be better off making a deep manhole and entering the pond at gentler slope? I can not lift the outlet end of the pipe because of HGL concerns. Thanks for the help.
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