Storm Sewer Inlet Calculations
Storm Sewer Inlet Calculations
(OP)
Is there any software programs available that can determine the location and spacing of inlets?
Thanks,
Thanks,
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Storm Sewer Inlet Calculations
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RE: Storm Sewer Inlet Calculations
RE: Storm Sewer Inlet Calculations
Manual:
www.fhwa
Software:
http://www
Software is for HEC22, which is a far more comprehensive document than HEC12.
Engineering is the practice of the art of science - Steve
RE: Storm Sewer Inlet Calculations
Be careful using the FHA computer Models -- the hydrology may not be valid.
RE: Storm Sewer Inlet Calculations
I disagree. Typically, Inlet spacing is dictated by hydraulic criteria. For instance, the allowable width of flow in a street maydictate where inlets need to be placed based on normal flow in a road section.
I have written a spreadsheet that will (with some coding for geometry) calculate the flow rate and flow width based on roadway station. I also coded my spreadsheet to compute the inlet capture rate and resulting bypass flow. This was all based on the FHWA HEC-22 manual and the rational method. I have not found software that will easily evaluate the data without constant coding (entering drainage area). Although my spreadsheet simplyfies the approach, it works very well.
RE: Storm Sewer Inlet Calculations
Spreadsheets can be set up to recompute area each time you tweak the inlet spacing, but require time to setup and adjust for each project.
If this is something you are doing for one project, consider using the HEC-22 software. If you are going to do roadway inlet spacing analysis frequently, you might as well get used to the spreadsheet approach. You can often find a starting point from your local City or DOT. Attached find a link to a sample worksheet.
http://www
Your analysis can help ensure safe driving conditions; then check spacing results against local regs/criteria.
RE: Storm Sewer Inlet Calculations
RE: Storm Sewer Inlet Calculations
StormCAD will do a lot of these calcs, but you have to decide where the inlets will go, and then verify that they have capacity and that the spread is not too great.