Guidelines for Evaluating and Selecting Modifications to Existing Roadway Drainage Infrastructure to Improve Water Quality in Ultra-urban Areas

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Transportation Research Board, 2012 - Road drainage - 167 pages
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"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 Microsofta 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."--Summary.
 

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Contents

Section 1 Introduction
1
Section 2 UltraUrban Highway Runoff Characterization
8
Section 3 Retrofit Drivers and Practices
20
Section 4 BMP Options for UltraUrban Highway Retrofits
24
Section 5 Evaluating BMP Effectiveness
69
Section 6 BMP Sizing and Design
83
Section 7 Maintenance and Monitoring
94
Section 8 Retrofit Costs
104
Section 9 Retrofitting Strategies and Process
109
Section 10 Case Studies
124
References
161
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