Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide (2022) / Chapter Skim
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5 An overall decision framework is critical for a successful outcome for state DOTs implementing a watershed approach to mitigate hydrologic impacts of transportation projects. Figure 2.1 provides an overview of a high-level decision framework that describes the primary implementation steps.
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6 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide Step 1: Identify Project(s) for Evaluation Because the framework addresses a watershed approach, multiple projects within a given watershed may be assessed within the same watershed and over time.
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Watershed Mitigation Decision Framework 7 the watershed will also define how various hydrologic criteria are applied. NCHRP Web-Only Document 333 discusses watershed definitions.
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8 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide The watershed will contain the transportation project or projects under consideration and will also include the area within which out-of-kind mitigation techniques may be applied to compensate for project hydrologic impacts. One of the benefits of watershed-based analyses is that it allows a single watershed-wide model application to provide impact and performance information for multiple APs, and thereby improves the cost-effectiveness of the application.
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Watershed Mitigation Decision Framework 9 Evaluation of on-site in-kind mitigation techniques is well-established and is not the focus of this Guide. State DOTs have many resources for evaluating these techniques.
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10 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide will eliminate unsuitable options, thereby saving effort in the detailed analysis phase. As part of this step, the division of responsibility for the screening assessment between the state DOT and external partners/stakeholders is established.
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Watershed Mitigation Decision Framework 11 mitigation techniques. This step is reached when the parties wish to continue with the watershed approach, but the screening assessment yielded ambiguous or overly general results that were not actionable.
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