Stormdrain restriction?
Stormdrain restriction?
(OP)
The City where I live are requesting 2X storm drain in every low points (with circular 30 inches grate).
They connect both storm drain using 6" PVC pipe but then they connect the 2x 6" PVC pipes to 1 single 8" PVC pipe using a "Y" and a bend then to the main sewer line.
I think (without performing any calculation yet) that the grate capacity might exceed the 8" PVC pipe capacity.
What do you guys think?
They connect both storm drain using 6" PVC pipe but then they connect the 2x 6" PVC pipes to 1 single 8" PVC pipe using a "Y" and a bend then to the main sewer line.
I think (without performing any calculation yet) that the grate capacity might exceed the 8" PVC pipe capacity.
What do you guys think?





RE: Stormdrain restriction?
RE: Stormdrain restriction?
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Stormdrain restriction?
The grate has a net opening of 1.615 sqf. which with 6'' of water above it has a capacity of 5,7 cfs.
If there is 5' of water in the stormdrain, the capacity of a 6'' pipe is ... 2,1 cfs.
So less than the grate capacity.
I think that putting 2 stormdrains in a low point might be a good idea (i.e. clogging, debris, etc.) but not connecting them with 1 single 8'' PVC.
RE: Stormdrain restriction?
6 or 8 inch is way too small, 12 or 15 inch is more common. some agencies allow nothing smaller than 18 inch
RE: Stormdrain restriction?
A 18 inches seems a bit extreme though as you have to connect this pipe to a main sewer without manhole (?).
RE: Stormdrain restriction?