20220212 Ver 1_Solana SCM details_20220411

Wet Detention
Basin Outlet
Adjacent to Culvert
This is the only location we have to outlet the flow from the
basin outside of the wetland. The normal pool of the pond Is 1-ft lower than
the stream invert at this theoretical outlet location which made the location
infeasible. The normal pool of the pond can not be raised, because i1 would
backup water Into the low po nt of the road crossing In larger storm events.
To Increase the elevation of the roadway lowpolnt would require pushing the
retaining walls/fill slopes outward and creating more open wafer/wetland
impact. We are extremely tight on the critical elevations including the
roadway low point. the normal pool of the pond, and the outfall location as
currently designed.
It Is also our opinion that placing the pond outlet adjacent 10 the culvert will provide the lowest Impact to the wetland in terms of flow and velocity
increases, because the flow coming from that pipe will be minuscule
compared to the flow In the culvert, particularly In large storm events.
wet detention
Pond normal pool
It
NOT PART OF
THIS SUBMITTAL
Roadway low point R
ev = 294.1