Efficiency of Urban Stormwater Best Management Practices: A Literature Review
Washington State Department of Ecology , 2007

Hallock, D.

This report is a literature review of urban stormwater best management practices (BMPs) efficiency studies. Efficiency studies are seldom conducted using common methods, so results are not directly comparable. Nevertheless, best management practice (BMP) performance data from different studies have been compiled. Some of these compilations are reviewed in this document. One compilation produced an Access© database of BMP performance. This database can be used to help identify suitable BMPs. This report summarizes some of the results in the database along with confidence limits for different BMP types. Not all BMP types consistently improve water quality. Even when average efficiency of a particular type is positive (i.e., water quality is improved by the average BMP), 90% confidence limits frequently include 0.