Which HEC program is best for this application
Which HEC program is best for this application
(OP)
There are several HEC programs available for modeling, but I'm not sure which is right for my particular problem.
First a little background:
There is a small lake here in South Jersey with a damaged dam/weir that needs to replace. This weir is the only outflow structure for a small lake.
I dont think I can use HEC-RAS because the upstream section isn't really a river. It seems to me that trying to draw the upstream cross section wouldnt make sense, because its not really flowing, its more of a storage basin. Any ideas which program could help me out?
First a little background:
There is a small lake here in South Jersey with a damaged dam/weir that needs to replace. This weir is the only outflow structure for a small lake.
I dont think I can use HEC-RAS because the upstream section isn't really a river. It seems to me that trying to draw the upstream cross section wouldnt make sense, because its not really flowing, its more of a storage basin. Any ideas which program could help me out?





RE: Which HEC program is best for this application
RE: Which HEC program is best for this application
RE: Which HEC program is best for this application
RE: Which HEC program is best for this application
RE: Which HEC program is best for this application
There's a forum here on Eng-Tips that supports HydroCAD, which would be another fairly straight forward option. It's got a free 5 node trial version which should do fine for your application, but I think the free version still prints "EVALUATION COPY" on all your printouts / etc.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Which HEC program is best for this application
So I have another question for this, but as usual I need to provide a little more background:
As previously mentioned, the start of the stream will actually be a large pond that flows out through a wier into a stream. The problem im running into is that the weir we want/need to put in is a U shape, meaning part of it is perpendicular to the flow and some of it is parallel.
I know HEC-RAS can model the cross section (i.e. perpendicular length of wier), but what about the parallel faces of the wier?
If I can model this, what sort of data am I looknig for as my input?
A few cross sections (station and elevations) of the river and lake
peak flow data
length/size of the wier
Thanks again to everyone so far, Happy Holidays to All
RE: Which HEC program is best for this application
If you want to do watershed and pond routing (i.e., hydrology) of a given rainfall event, HEC-RAS won't get you there, you need a hydrologic model like HEC-HMS, TR-55, etc (there are a million all equally capable and exceptable).
HEC-RAS is a hydraulic model that will solve a stage-discharge rating, or reservoir head at a given flow rate (i.e., hydraulics).
If all you're interested in is the stage-discharge rating of the weir, and your point of interest is at or near the weir, or the reseroir can be assumed level, then I'd suggest skip the computational programs altogether and get out your hand calculator:
Flow Rate = Discharge Coefficient x Weir Length (total length of "U") x Reservoir Head^1.5
RE: Which HEC program is best for this application
Isn't there a chapter in the Hydraulic Reference Manual about doing dam breach analyses?
RE: Which HEC program is best for this application
RE: Which HEC program is best for this application