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Modeling runoff of a small design-graded yard

Modeling runoff of a small design-graded yard

Modeling runoff of a small design-graded yard

Dear All;

I have a container yard to design stormwater drainage facility (about 10 acre). As per the local standards - I have to calculate the runoff using the modified rational method for a 100 year storm event. The client requirements is to design a detention pond - and I have done so using manual calculations.

The engineer who will review and approve the design required to have the modeling using an analayis software.

I am currently using C3D but it does not have tools for that - it can be used to desig the grading or the pond (geometrically)

What is the available - free (or open source) best software for this task - i.e model the runoff and compute the discharge

Thank you all for your help

RE: Modeling runoff of a small design-graded yard

Have you looked at using HEC-HMS? its free and would get you closer to what you need.

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