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
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