Stream-Profile Analyses Using a Step-Backwater Model for ... - USGS

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iv Tables 1. Original design characteristics of the Soil Conservation Service flood-retention structures ...........................................................................................................6 2. Hydraulic model limits for selected streams in the Chippewa Creek basin, Medina, Wayne, and Summit Counties, Ohio ...........................................................................6 3. Summary of data collected from field surveys used for the step-backwater models in the Chippewa Creek basin, in Medina, Wayne, Stark, and Summit Counties, Ohio .........................................................................................................7 4. List of benchmarks used to establish a Global Positioning System control network for the surveying of the Chippewa Creek basin and the accuracies of those measurements ...................................................................................8 5. Basin characteristics and approximate bankfull flow at various locations for selected streams in the Chippewa Creek basin ................................................................9 6. Average decrease in water-surface elevation, in feet, along the selected reach after decreasing the Manning’s roughness coefficient (n) for the main channel by 5, 10, 15, and 20 percent from the base values .......................................11 2–1. Selected Hydrologic Engineers Center’s River Analysis System output for Chippewa Creek, Medina, Wayne, and Summit Counties, Ohio. ......................34 2–2. Selected Hydrologic Engineers Center’s River Analysis System output for Westfield Ditch, Medina County, Ohio .................................................................... 46 2–3. Selected Hydrologic Engineers Center’s River Analysis System output for River Styx, Medina and Wayne Counties, Ohio ....................................... 48 2–4. Selected Hydrologic Engineers Center’s River Analysis System output for Little Chippewa Creek , Wayne County, Ohio ....................................................................54 3–1. Water-surface elevation, in feet, along Chippewa Creek after decreasing the Manning’s roughness coefficient (n) for the main channel by 5, 10, 15, and 20 percent .......................................................................................................59 3–2. Water-surface elevation, in feet, along River Styx after decreasing the Manning’s roughness coefficient (n) for the main channel by 5, 10, 15, and 20 percent .......................................................................................................71 3–3. Water-surface elevation, in feet, along Little Chippewa Creek after decreasing the Manning’s roughness coefficient (n) for the main channel by 5, 10, 15, and 20 percent ..............................................................................77
Conversion Factors and Abbreviations Multiply By To obtain Length inch (in.) 2.54 centimeter (cm) centimeter (cm) 0.3937 inch (in.) foot (ft) 0.3048 meter (m) mile (mi) 1.609 kilometer (km) Area acre 4,047 square meter (m 2 ) square foot (ft 2 ) 0.09290 square meter (m 2 ) square mile (mi 2 ) 2.590 square kilometer (km 2 ) Volume per unit time (includes flow) cubic feet per second (ft 3 /s) 28.32 cubic decimeter per seond (dm 3 /s) Volume acre-foot (acre-ft) 1,233 cubic meter (m 3 ) Flow rate foot per second (ft/s) 0.3048 meter per second (m/s) Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Other abbreviations FEMA Federal Emergency Management Agency FIS Flood Insurance Study GPS Global Positioning System HEC-RAS Hydrologic Engineers Center’s River Analysis System MWCD Muskingum Watershed Conservancy District SCS Soil Conservation Service TIN Triangular Irregular Network USGS U.S. Geological Survey v
Page 1 and 2: In cooperation with the Chippewa Su
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Appendix 2 55 Table 2-4. Selected H
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