Drainage Trench Conveyance Capacity
Drainage Trench Conveyance Capacity
(OP)
Hello,
If I have a drainage trench 600mm x 600mm filled with large stones, assuming a porosity of 0.33 and a gradient of 1/200 what is the best way to caculate the conveyance capacity in l/s. In other words what is the maximum flow rate the trench can pass downstream to the outfall.
I would assume using mannings formula with a very high n value wouldn't be suitable?
Thanks
If I have a drainage trench 600mm x 600mm filled with large stones, assuming a porosity of 0.33 and a gradient of 1/200 what is the best way to caculate the conveyance capacity in l/s. In other words what is the maximum flow rate the trench can pass downstream to the outfall.
I would assume using mannings formula with a very high n value wouldn't be suitable?
Thanks





RE: Drainage Trench Conveyance Capacity
RE: Drainage Trench Conveyance Capacity
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Drainage Trench Conveyance Capacity
RE: Drainage Trench Conveyance Capacity
RE: Drainage Trench Conveyance Capacity
RE: Drainage Trench Conveyance Capacity
Q=K(dh/dx)By
and, y = h - Sx
or Q = K (dh/dx)B(h - Sx)
B = Width
y = Depth
x = location upstream from the downstream end
S = bottom slope
h = energy head (y + Sx)
The differential equation can be solved using a standard step method, and by varing Q until h = the top of the channel at the upstream end.
RE: Drainage Trench Conveyance Capacity
RE: Drainage Trench Conveyance Capacity