Floodway Data Table Slideshow
This slideshow looks at each of the Floodway Data Table columns and provides a graphical representation of the data. Scroll down to see slide captions.
Shows how the Flood Data Table Cross Section column relates to cross sections that are identified graphically on flood maps, including stream centerline, 100 Year Flood elevation, Cross-Section , a cross section letter identification, i.e. A. Shows Plan View Section "A" and Cross-Section View "A"Shows what the Flood Data Table Distance column references on a flood map, including stream centerline, Zone designations i.e. Zone AE, Zone A, and Cross section letter identifications (A, B, C, D, E)Shows what the Flood Data Table Floodway Width column references on a flood map. Inset of Floodway width a cross section B between 106 and 107.Shows what the Flood Data Table Floodway Section Area column references on a floodway cross section diagram that shows a shaded Floodway Section Area between encroachments. The surface level is the Flood elevation when confined within the floodway. The diagram also shows the area of floodplain that could be used for development by raising the ground and the Flood Elevation before encroachment on the floodplain.Shows what the Flood Data Table Floodway Section Area column references in a diagram. Mean velocity is the 10-year flow divided by the cross-sectional area of the floodway. The velocity is measured in feet per second. In the equation q divided by a equals v; q equals discharges, a equals area, and v equals Mean Velocity. For example; 2,000 cfs divided by 500 feet flow area equals 4 feet per second.Shows how the Flood Data table Regulatory Base Flood Elevation Regulatory column includes backwater effects from other streams.Shows how the Flood Data table Regulatory Base Flood Elevation Without Floodway column does not account for backwater effects from other streams.Shows how the Flood Data table Regulatory Base Flood Elevation With Floodway column references the shaded With Floodway Flood Elevation between the encroachments. The diagram shows the area of floodplain that could be used for development by raising the ground and the Flood Elevation before encroachment on the floodplain. It also point to the Flood elevation before encraochment on floodplain level.Shows how the Flood Data table Regulatory Base Flood Elevation Increase column references the distance between the Floodway Elevation when Confined within the floodway and the Flood Elevation before encroachment on the floodplain. Also shown in the diagram are area of floodplain that could be used for development by raising the ground and the encroachments. The increase in surcharge is identified and a note: Surcharge is not to exceed 1.0 foot (FEMA requirement) or lesser amount if specified by State or Community
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Column 1: Flooding Source: Cross SectionColumn 2: Flooding Source: DistanceColumn 3: Floodway: Width (Feet)Column 4: Floodway: Section Area (Square Feet)Column 5: Floodway: Mean Velocity (Square Feet)Column 6: Base Flood Water Surface Elevation (Feet NGVD): RegulatoryColumn 7: Base Flood Water Surface Elevation (Feet NGVD): Without FloodwayColumn 8: Base Flood Water Surface Elevation (Feet NGVD): With FloodwayColumn 9: Base Flood Water Surface Elevation (Feet NGVD): Increase