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In this lesson we discussed the following topics: - Hydrologic analyses study the amount of water and Hydraulic analyses study the flood height or elevation of water.
- Newer FISs will contain hydraulic models with multiple frequencies: 10-percent (10 year), 4-percent (25 year), 2-percent (50 year), 1-percent (100 year), and 0.2-percent (500 year) annual chance exceedance events.
- FIS Section 3.0 Engineering Methods has three Subsections.
- 3.1 Riverine Hydrologic Analyses includes:
- Sources of data (topographical maps, gage data, land use maps, and soil information)
- Methods of analysis (drainage areas-discharge curves, gage data analysis, regression equations, and rainfall-runoff models)
- Summaries of the drainage areas and peak discharges.
- 3.2 Riverine Hydraulic Analyses includes:
- Sources of data (cross sections, roughness coefficients, starting water surface elevations), and
- Methodologies describe how the flood elevations and the various components were calculated.
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