We're trying to show compliance with SSc6.1. On the form they ask for Pre-development and Post-development runoff rates and quantities. The credit requires "Case 2. Existing imperviousness is...

The key for volume calculation is knowing the 1 and 2-year, 24 hour storm depth. This is calculated fordifferent locations and it is a long process and it is not the same as calculating runoff...

There is a point of contention within my office that I'm hoping can be cleared up by posting here. When considering the "1- and 2-year 24-hour design storms", is it possible to meet the quantity...

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"Impervious surfaces have a perviousness of less than 50% and promote runoff of water instead of...

Has anyone out there had any success using the Stream Channel Protection option (Option 2 for CASE 1) where the existing impervious is less than 50%?

I've got an urban project (in Denver...

Calculation of a 2-year, 24 hour storm is a lengthy process. See my comments above on this issue. Rainfall amounts, especially for one year, will not provide you with a 2-year, 24 hour storm...

Your calculations are correct. You will have to develop strategies to infiltrate, evapotranspire, or...

Working through the rational method, I've calculated the Time of Concentration (Tc), then itterated using IDF (intensity-duration-frequency) charts until the duration = time of concentration (...