Hello there. My team and I are certifying a building in Brazilia, Brazil. I would like to check if I'm right about the procedure to accomplish SSc6. 1) Find the average weather year precipitation; 2) Separete all areas of the total site (example: asphalt, concrete, brick, ...) 3) Calculate the total runoff volume (Q = C i A): sum all Q's from all different types of areas 4) Calculate the volume of captured runoff by a cistern 5) Evaluate the minimum drawdown rate 6) Evaluate if the volume of captured runoff is bigger than 15% of the total runoff volume. Is that all right? Just to check, if the ratio between impervious area and green area is equal to 5, I don't need to worry about cisterns, right? By the way, how am I supposed to extimate the rainfall event interval? And the last question is: average rainfall event = total precipitation / number of rainfalls ? Thank you so much!! God bless you all.

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Wed, 06/24/2015 - 19:35

Hi Hugo, the Rational Method (Q=CIA) will give you a runoff rate, not volume. You need to use another methodology to determine runoff volume (I prefer SCS). Average rainfall is the average depth, you may be able to find this somewhere in local weather data. I recommend that you use a civil engineer or other stormwater professional to develop your stormwater management program.

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