Need Hydrology help (channel & Flood Calcs)
Need Hydrology help (channel & Flood Calcs)
(OP)
I am new at all this hydrology stuff and need some help.
I have cross sections of a channel at 50' intervals for 400'. I need to calculate where the water level will be at each section with a 1000 CFS running through it. I can't seem to find a direct answer in any books I have looked in. My assumption is that the cross-sectional area of the channel will have something to do with the equation, but I can't seem to find any equations refering to a cross sectional area. Can anyone help me with an equation for this problem?
I have cross sections of a channel at 50' intervals for 400'. I need to calculate where the water level will be at each section with a 1000 CFS running through it. I can't seem to find a direct answer in any books I have looked in. My assumption is that the cross-sectional area of the channel will have something to do with the equation, but I can't seem to find any equations refering to a cross sectional area. Can anyone help me with an equation for this problem?





RE: Need Hydrology help (channel & Flood Calcs)
http://www.hec.usace.army.mil/
It is the standard for one-dimensional backwater calculation programs.
If you want to do the calculations by hand--the equation is the standard step equations which is based on the energy equation. For non-uniform cross-sections this can be a little tricky. RAS is probably the best route, especially since it is free and national accepted.
If your cross-sections are uniform you can just use the Mannings equation.
RE: Need Hydrology help (channel & Flood Calcs)
Chuck
cgopperton@stantec.com
http://www.stantec.com/