Working out Flow through a stormwater pipe with only top water level known
Working out Flow through a stormwater pipe with only top water level known
(OP)
Hi, I am having a bit of trouble working out how to figure out the maximum flow through a pipe network when the water is at a specified level? I know all the dimensions etc of the network and I am having trouble figuring out how to find the maximum flow that will travel downs the pipes at the head. The level is above a full pipe so I can't use Mannings. Any help would be much appreciated. Thanks





RE: Working out Flow through a stormwater pipe with only top water level known
I'm sure there are other ways to get your answer, but depending on the size of your network, this may be a good option. Good luck.
RE: Working out Flow through a stormwater pipe with only top water level known
RE: Working out Flow through a stormwater pipe with only top water level known
The elevation of the water at either end can be used to calculate the HGL slope if both ends are submerged.
You can account for entrance and exit losses with a K-factor and iterate to find a solution given the water level at each end and full flow pipes.
The flow is easier to calculate when both ends are submerged because you don't have to deal with headwater and tailwater effects.
cvg and froude give good advice depending on your situation.
RE: Working out Flow through a stormwater pipe with only top water level known
RE: Working out Flow through a stormwater pipe with only top water level known