Watershed Approach to Mitigating Hydrologic Impacts of Transportation Projects: Conduct of Research Report (2022) / Chapter Skim
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Pages 279-291
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279 Appendix C Existing Screening Tools Existing tools were evaluated to assess whether they could be useful in screening-level analyses of project impacts and mitigation effectiveness within a watershed context.
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280 continuous model of the available rainfall data for a site, and compute flow duration statistics. However, enhancement of the Calculator would be necessary to represent flow routing, thus allowing application at a watershed, rather than footprint, scale.
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281 Figure C.2. National SWC – watershed definition.
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282 Results are provided in terms of annual average runoff. The tool allows for scenarios, as one simulation can be designated the baseline, for comparison with the current scenario as shown in Figure C.4..
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283 As an example of an assessment using the WWHM consider a site in King County, WA. The tool allows the user to specify the site as a point on the map, as shown in Figure C.5.
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284 Figure C.6. WWHM – predevelopment subbasin creation.
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285 C.3. Model My Watershed Model My Watershed® (Stroud Water Research Center 2017)
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286 Results are displayed as average monthly water fluxes as shown in Figure C.9. Presumably since this tool is running a continuous simulation model (GWLF-E)
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287 WMOST is a spreadsheet tool run within Excel with the interface shown in Figure C.10. HRU characteristics can be entered through the EPA's Estuary Data Mapper, which uses an online inventory to populate needed time series from existing data.
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288 land cover area. Scenarios are accommodated in the interface through editing the input parameters and project files.
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289 Figure C.12. HAWQS – flow duration plot.
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290 Figure C.13. HEC-HMS user interface.
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291 To enable the watershed-based screening assessments, the research team would enhance the user interface to the SWC with a new tab representing hydrography. The hydrography tab would enable download of flowlines and catchments through the NHDPlus v2 dataset available in BASINS.
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