unit hydrograph
unit hydrograph
(OP)
i want to find unit hydrograph for the storm of 500 year return period (which rainfall is 10 inch).i use "curvilinear dimensionless unit hydrograph" and find the discharge.which is 128000 cusec. but when i put the same parameter in hec hms the result is only 40000 cusec discharge. i tried many other data. but the same result come.i.e peach discharge of curvilinear dimensionless unit hydrograph method is too much as compared to hem hms. can any one help me in this regard
RE: unit hydrograph
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: unit hydrograph
RE: unit hydrograph
Retract that - I overlooked the fact that you're using a 6-hour storm, so the time increment may be OK.
HOWEVER, the peak runoff for a 6-hour Type II storm should be roughly between 3 and 4 hours - not 15 hours as shown in your calculations. I would recheck the spreadsheet.
Peter Smart
HydroCAD Software
www.hydrocad.net