TRB’s National Cooperative Highway Research Program (NCHRP) Report 728: Guidelines for Evaluating and Selecting Modifications to Existing Roadway Drainage Infrastructure to Improve Water Quality in Ultra-Urban Areas provides guidelines to evaluate and select hydraulic modifications to existing drainage infrastructure that will help mitigate potential impacts of highway runoff on receiving waters.
The guidelines are directed specifically at roadway facilities in dense urban areas that can be particularly difficult and costly to retrofit because of space limitations, high pollutant loadings, hydrologic flashiness, hydraulic constraints, legacy contamination, utility conflicts, and other issues.
The guidelines are accompanied by a Microsoft® Excel-based design and sizing tool on a CD-ROM included with the print version of the report. The tool generates best management practice (BMP) performance curves that relate the performance and design criteria for selected BMP controls described in the guidelines for each of the 15 U.S. rain zones.
The excel spreadsheet that is content on the CD-ROM is available for download.
Excel Spreadsheet Disclaimer - This software is offered as is, without warranty or promise of support of any kind either expressed or implied. Under no circumstance will the National Academy of Sciences or the Transportation Research Board (collectively "TRB") be liable for any loss or damage caused by the installation or operation of this product. TRB makes no representation or warranty of any kind, expressed or implied, in fact or in law, including without limitation, the warranty of merchantability or the warranty of fitness for a particular purpose, and shall not in any case be liable for any consequential or special damages.
Table of Contents
|Section 1 - Introduction||1-7|
|Section 2 - Ultra-Urban Highway Runoff Characterization||8-19|
|Section 3 - Retrofit Drivers and Practices||20-23|
|Section 4 - BMP Options for Ultra-Urban Highway Retrofits||24-68|
|Section 5 - Evaluating BMP Effectiveness||69-82|
|Section 6 - BMP Sizing and Design||83-93|
|Section 7 - Maintenance and Monitoring||94-103|
|Section 8 - Retrofit Costs||104-108|
|Section 9 - Retrofitting Strategies and Process||109-123|
|Section 10 - Case Studies||124-160|
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