The existing site utilized for this development was an asphalt parking lot. The new facility will incorporate landscaping and locally typical on-site retainage using retention/collection basins and "injection wells" (drywells) which are typical for the Phoenix, Arizona area. This method encourages the natural process of evaporation and infiltration. The new development design will not only provide no net increase in the rate and quantity of stormwater runoff, but will actually result in reduction in stormwater runoff. Is this locally typical method of on-site retention acceptable to capture this credit since it is not addressed in the Reference Guide as a "Design Approach"?
There would be no net increase in stormwater runoff and therefore this approach meets the intent of the credit. Provide a narrative describing the approach, as well as the calculations for Credit 6, for the LEED Application. Please see Inquiry 2001.06.28 on the U.S. Green Building Council website addressing this issue and the favorable response. Applicable Internationally.