Converting concetrated flow to sheet flow
Converting concetrated flow to sheet flow
(OP)
Does anyone use anything other than dispersion walls or rip-rap to convert concetrated flow to sheet flow? The owner of this project is also thinking about using a sump pump. It seems there are a lot of disadvantages with this option.
Any feedback would be greatly appreciated.
Any feedback would be greatly appreciated.





RE: Converting concetrated flow to sheet flow
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RE: Converting concetrated flow to sheet flow
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RE: Converting concetrated flow to sheet flow
RE: Converting concetrated flow to sheet flow
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RE: Converting concetrated flow to sheet flow
And why so deep for the influent pipe, unless you are trying to pickup some infiltration, which is actually a good use of land.
20% inflow gradient? Man, that water will be moving. I think I'm going to back that down a lot.
25 feet on level 4" pipe, with one cleanout? Probably OK, w/ 6" pipe, or more frequent CO's.
Needs note spec'ing 25' from bldg foundation.
Why solid cover on inlet? I'm using a grate, for better dispersal and larger inflows.
I'm allowing square or v-notch overflows. Constructability will be a nightmare w/ concrete v-notches, if cast in place.
I would actually call out AASHTO #3 stone (or whatever you prefer). I've been bitten too often by the Contractor saying "that IS clean stone", while pointing at a pile of Suitable Backfill.
Call out AASHTO Class 2 geotextile. I've been bitten too often by the Contractor saying "that IS filter fabric", while pointing at a roll of some flimsy stuff of indeterminate tensile stress.
Engineering is the practice of the art of science - Steve
RE: Converting concetrated flow to sheet flow
There are a few other designs, some using concrete components instead of wood, in the WA State stormwater manual, see pages 4-16 to 4-21 of Volume V per the attached link.
http://www.ecy.wa.gov/biblio/0510033.html