|Storm Water Best Management Practice Design Guide (EPA/600/R-04/121) September 2004
This document’s focus is on the development of ways to address water quality issues associated with best management practices (BMPs) in the absence of a complete regulatory framework. The intended audience for this document is municipal planners, regulators, and watershed managers who will be deciding how BMPs will be applied in their locality.
In the past, BMP models were purely hydrologic. Now they require two components: hydrology and quality. The purpose of this document is to present the state of the science for BMP design for water quality control and to aid the end user in making better choices.
The first volume of this three-volume series provides guidance on the selection and design of storm water BMPs.
The second volume provides specific design guidance for a group of on-site BMP controls that are referred to as vegetative biofilters. The BMP controls described in this volume are grass swales, filter and buffer strips, and bioretention cells. Volume 2 is the only volume that contains the full storm routing, which is applicable to all treatment controls.
The third volume provides specific guidance for basin-type BMPs, which are the most widely used type of BMP. This volume covers extended detention basins (dry), retention ponds (wet), constructed wetland ponds, and infiltration basins.
The purpose of this series is to provide guidance when selecting BMPs (either through retrofitting of existing BMPs or applying newly constructed BMPs to new development) to prevent or mitigate the adverse effects of urbanization. There is sufficient evidence to indicate that urbanization is causing environmental impacts; existing BMP technologies can mitigate some of the impacts. Innovative BMP efforts, such as bioretention, infiltration basins, and low-impact development, are being pursued at the research level and in some actual applications; this should improve our ability to reduce or prevent adverse effects due to urbanization and land-use changes.
The authors have also developed a spreadsheet tool, called Integrated Design and Assessment for Environmental Loadings (IDEAL) that can aid the reader in examining the hydrology, sediment transport, and water quality for BMP devices. Capabilities of IDEAL are demonstrated through the use of relevant equations for BMP water quality design. Several examples are presented in Volumes 2 and 3.
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