Stormwater Library

resources for stormwater professionals

Archive for stormwater runoff

Developing a Stormwater Credit System for Using Trees

The following four municipalities have developed a stormwater credit system for developers who incorporate trees into their stormwater plans:

The issue of quantifying reduction rates can be a difficult one due to the different capacities of tree species. For more information on use of trees as a stormwater BMP, please refer to the recent study on Trees and Structural Soils by the Department of Urban Forestry at Virginia Tech University. Developers and design professionals can also refer to the Green Values Calculator, which allows you to create hypothetical designs using trees and other green interventions and quantifies the results in terms of costs savings and reduction in stormwater discharge.

Over the next several weeks, I will be presenting a series on how the municipalities of Pine Lake, Sacramento, Portland, and Indianapolis each went about changing the local building code to include stormwater credits for trees.

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Stormwater Factoid: City of Los Angeles

The City of Los Angeles generates over 100 million gallons of stormwater runoff a day during the wet season. Even more astonishing…during the dry season, over 10 million gallons of urban runoff is generated.

Source: Los Angeles times via Aquafornia (http://aquafornia.com)