Volume Reduction of Highway Runoff in Urban Areas: Guidance Manual (2015) / Chapter Skim
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1 C H A P T E R 1 This chapter introduces the purpose and origin of NCHRP Report 802: Volume Reduction of Highway Runoff in Urban Areas: Guidance Manual, the regulatory and policy drivers for designing for volume reduction, the intended users and uses of this guidance, and the organization of the remainder of the document. The major questions addressed in this chapter are: • What does this manual seek to achieve?
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2 Volume Reduction of Highway Runoff in Urban Areas to urban highway projects. The current state of the practice for achieving volume reduction is incorporated.
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Introduction 3 greater emphasis on surface runoff volume control. Volume control is already encouraged in some MS4 permits issued to DOTs -- for example, Caltrans (California State Water Resources Control Board, 2012)
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4 Volume Reduction of Highway Runoff in Urban Areas environment and potential adverse impacts associated with volume reduction designs. Figure 1 summarizes the range of users and potential uses, organized in approximate chronological order from planning-level to design-level uses.
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Introduction 5 Chapter 2 describes a step-by-step model approach for incorporating volume reduction techniques into an urban highway project and describes how this manual can be used to support planning and analysis at each project phase. Chapter 3 provides a baseline characterization of the urban highway environment related specifically to achieving surface runoff volume reduction.
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6 Volume Reduction of Highway Runoff in Urban Areas numerical ranges and guidance. However, professional expertise and judgment must be exercised by qualified professionals based on site-specific information to develop project plans and designs.
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