Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide (2022) / Chapter Skim
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1 This Guide describes procedures and resources for analyzing the hydrologic impacts of transportation projects as well as the hydrologic benefits and co-benefits of out-of-kind mitigation techniques using a watershed approach. Co-benefits are benefits of stormwater mitigation in addition to the primary hydrologic objectives (e.g., improvements to recreation opportunities or enhancement of climate resilience of water supplies)
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2 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide Out-of-kind mitigation addresses the negative impact of a transportation project by compensating for that impact using the same metric applied to quantify the impact while also providing co-benefits by improving a different, but related watershed function. In some cases, the most attractive purpose of out-of-kind mitigation could be one or more of the co-benefits rather than reducing the hydrologic impact of the project.
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Introduction 3 Forest restoration and creation. Forest lands can mitigate the hydrologic impacts of transportation projects by slowing runoff primarily because of the presence and roughness of ground cover and infiltration.
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4 Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Guide Uplands restoration may be in the form of landscape conversion (e.g., from a parking lot to a meadow or a pocket forest or from agricultural land to grassland) or landscape enhancement (e.g., from a sparse meadow with exposed bare earth to a more densely vegetated landscape)
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