If I can calculate the volume of runoff using the site impervious area in square feet and the 95th percentile rainfall over 24 hours in inches, do I also need to use one of the tools identified in the guidebook to calculate the runoff volume? The guidebook provides a sample calculation in the example on page 80, which doesn't require any tool. My intent would be to upload an excel sheet showing how I arrived at the runoff volume calculation.

Has anyone had issues submitting rainwater harvesting as a GI or LID strategy?

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Ashwini Arun

Senior Sustainability Manager

WSP

LEEDuser Expert

53 thumbs up

Tue, 03/06/2018 - 21:24

Gail, Take a look at LEED Interpretation 100001950, which outlines the protocol for calculating the total runoff. This LEED Interpretation replaces the Calculations section in the Reference Guide. You can use the Small Storm Hydrology Method for your calculations. You are not required to use the tools listed in the Reference Guide. A document outlining step-by-step calculations should be sufficient for this credit.

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