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Green Values® National Stormwater Management Calculator

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This is a tool for quickly comparing the performance, costs, and some benefits of green infrastructure practices to those of conventional stormwater management practices. The calculator takes users through a step-by-step process of determining the average precipitation at a site, choosing a stormwater runoff volume reduction goal, defining the impervious areas of the site under a conventional development scheme and then choosing best management practices to meets the runoff volume reduction goal in a cost-effective way.

  • Center for Neighborhood Technology’s Green Values Calculator™ is a tool for quickly comparing the performance, costs, and some benefits of green infrastructure practices to those of conventional stormwater management practices. The calculator takes users through a step-by-step process of determining the average precipitation at a site, choosing a stormwater runoff volume reduction goal, defining the impervious areas of the site under a conventional development scheme and then choosing from a range of green infrastructure best management practices to find the combination that meets the runoff volume reduction goal in a cost-effective way.
  • It includes the ability to calculate the costs of stormwater management before and after undeveloped land is converted to another use.
  • The calculator provides construction, annual maintenance and lifecycle cost comparisons to manage a specified volume of stormwater for green infrastructure and conventional scenarios. The calculator also estimates some of the non-hydrologic benefits of using green infrastructure.

http://greenvalues.cnt.org/national/calculator.php

Organization/Source: Center For Neighborhood Technology

Topic tags: Green Infrastructure