Main-Channel Slopes of Selected Streams in Iowa for Estimation of Flood-Frequency Discharges
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Prepared in cooperation with the IOWA DEPARTMENT OF TRANSPORTATION and the IOWA HIGHWAY RESEARCH BOARD (Project HR-456) Main-Channel Slopes of Selected Streams in Iowa for Estimation of Flood-Frequency Discharges Water-Resources Investigations Report 03–4120 21 Raccoon and North Raccoon Rivers 20 (figure 94) Buttrick Creek (figure 19), tributary to 19 North Raccoon River Hardin Creek (figure 47), tributary to 18 North Raccoon River South Raccoon River (figure 109), reach 17 downstream from confluence with Middle Raccoon River 16 Middle Raccoon River (figure 70) 15 Mosquito Creek (figure 74), tributary to Middle Raccoon River 14 Willow Creek (figure 139), tributary to Middle Raccoon River 13 South Raccoon River (figure 109), reach between confluences with Middle Raccoon 12 River and Brushy Creek Brushy Creek (figure 17) 11 South Raccoon River (figure 109), reach upstream from confluence 10 with Brushy Creek 9 8 7 6 MAIN-CHANNEL SLOPE, IN FEET PER MILE 5 4 3 2 0 25 50 75 100 125 150 175 200 225 DISTANCE UPSTREAM FROM MOUTH OF RACCOON RIVER, IN MILES U.S. Department of the Interior U.S. Geological Survey Main-Channel Slopes of Selected Streams in Iowa for Estimation of Flood-Frequency Discharges By David A. Eash U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 03–4120 Prepared in cooperation with the IOWA DEPARTMENT OF TRANSPORTATION and the IOWA HIGHWAY RESEARCH BOARD (Project HR–456) Iowa City, Iowa 2003 U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. For additional information write to: Copies of this report can be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey,Survey WRD Information Services RoomBox 25046, 269 Federal Mail Stop Building 415 Box 25286 P.Denver O. Box Federal 1230 Center Denver Federal Center 400Denver, South CO Clinton 80225–0046 Street Denver, CO 80225 Iowa City, IA 52244 CONTENTS Abstract.................................................................................................................................................................................. 1 Introduction............................................................................................................................................................................ 2 Purpose and Scope....................................................................................................................................................... 6 Acknowledgments ....................................................................................................................................................... 6 Main-Channel-Slope Measurement Methods ........................................................................................................................ 6 Manual Measurements................................................................................................................................................ 7 Geographic Information System Quantifications ........................................................................................................ 8 Comparison of Manual Measurements and Geographic Information System Quantifications .................................. 9 Main-Channel-Slope Curves.................................................................................................................................................. 10 Selection of Streams and Sites..................................................................................................................................... 11 Development of Curves ............................................................................................................................................... 11 Adjustment of Curves .................................................................................................................................................. 15 Presentation of Curves................................................................................................................................................. 17 Estimation of Flood-Frequency Discharges Using Main-Channel-Slope Curves ................................................................. 18 Example 1 .................................................................................................................................................................... 18 Example 2 .................................................................................................................................................................... 19 Summary................................................................................................................................................................................ 20 References Cited.................................................................................................................................................................... 22 Supplemental Data ................................................................................................................................................................ 25 FIGURES 1–3. Maps showing: 1. Location of streams and sites in Iowa used to develop main-channel-slope curves ......................................... 3 2. Des Moines Lobe landform region and hydrologic regions in Iowa................................................................. 5 3. Topographic-map measurements for calculating main-channel slope ..............................................................8 4. Graph showing examples of curves developed using main-channel-slope values determined from manual measurements, GIS quantifications, and adjusted-GIS quantifications ....................................................... 12 5. Graph showing main-channel-slope curves of selected streams in the Raccoon River Basin .................................. 13 6. Map showing main channels of selected streams in the Raccoon River Basin......................................................... 14 7–144. Graphs showing main-channel slopes for: 7. Bear Creek, beginning at mouth in Jackson County ......................................................................................... 47 8. Bear and North Bear Creeks, beginning at mouth of Bear Creek in Allamakee County.................................. 48 9. Beaver Creek, beginning at mouth in Black Hawk County .............................................................................. 49 10. Beaver Creek, beginning at mouth in Polk County........................................................................................... 50 11. Big Bear Creek, beginning at mouth in Iowa County ....................................................................................... 51 12. Big Creek, beginning at mouth in Henry County.............................................................................................. 52 13. Big Creek, beginning at mouth in Linn County ................................................................................................ 53 14. Big Muddy Creek, beginning at mouth in Clay County.................................................................................... 54 15. Black Hawk Creek, beginning at mouth in Black Hawk County...................................................................... 55 16. Boyer River, beginning at mouth in Pottawattamie County.............................................................................. 56 17. Brushy Creek, beginning at mouth in Guthrie County...................................................................................... 58 18. Buffalo and East Branch Buffalo Creeks, beginning at mouth of Buffalo Creek in Jones County................... 59 19. Buttrick Creek, beginning at mouth in Greene County..................................................................................... 60 20. Cedar Creek, beginning at mouth in Henry County.......................................................................................... 61 21. Cedar Creek, beginning at mouth in Mahaska County ..................................................................................... 62 22. Cedar River, beginning at Buchanan-Black Hawk County line ........................................................................ 63 23. Chariton River, beginning at Wayne-Lucas County line................................................................................... 65 24. Chequest Creek, beginning at mouth in Van Buren County.............................................................................. 66 25. Clanton and North Fork Clanton Creeks, beginning at mouth of Clanton Creek in Warren County................ 67 26. Clear Creek, beginning at mouth in Johnson County........................................................................................ 68 CONTENTS iii 27. Crane Creek, beginning at mouth in Black Hawk County................................................................................ 69 28. Crane Creek, beginning at mouth in Fayette County........................................................................................ 70 29. Crooked and West Fork Crooked Creeks, beginning at mouth of Crooked Creek in Jefferson County........... 71 30. Deep Creek, beginning at mouth in Jackson County .......................................................................................