Investigate opportunities for increased stormwater mitigation (based on the inventory results) through water harvesting techniques or modifying surface areas to increase the amount of pervious surface.
You may use online toolsto determine region-specific rainfall amounts. However, since this data is not always readily available online, the best way to track down this information may be to contact your city or county stormwater management officials directly.
If cisterns, detention ponds, or other stormwater collection systems exist on site, assess their capacity and the area of surfaces from which they collect water, based on design documents or other system information.
If the project site contains a number of different surface slopes and grades, you can simplify the calculation process by classifying the majority of appropriate surface areas as “steep.” This will generate the most conservative calculation of stormwater mitigation.
Perform a site inventory cataloging surface types, such as asphalt, concrete, roof areas, and landscaped areas. Use the LEED template to assess the percent of stormwater managed based on site perviousness.
The assessment must account for potential cost savings on water supply, disposal, and expected maintenance. The economic assessment should, at minimum, determine the simple payback of any new fixture investment. Carefully consider the payback period required to justify your purchasing decision.
Develop and implement a policy requiring an economic assessment of a conversion to high-performance plumbing fixtures and fittings as part of any future indoor plumbing renovation.
Perform a site inventory cataloging surface types, such as asphalt, concrete, roof areas, and landscaped areas. Use the LEED template to assess the percent of stormwater managed based on site perviousness.