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<br />CONTENTS--Continued <br /> <br />Page <br /> <br />Appendix A. Selected drainag,"-basin characteristics quantified using a geographic- <br />information-system procedure...., ........... .................................. ..................... ....... 45 <br /> <br />Appendix B. Techniques for manual, topographic-map measurements of primary <br />drainage-basin characteristics used in the regression equations.......................49 <br /> <br />Appendix C. Procedure for conducting channel-geometry measurements ..............................53 <br /> <br />Figure 1. <br /> 2. <br /> 3. <br /> 4. <br /> 5. <br /> 6. <br /> 7. <br /> 8. <br /> <br />ILLUSTRATIONS <br /> <br />Page <br /> <br />Map showing location of streamflow-gaging stations used to collect <br /> <br />drainage-basin data...... ............. ....... ....................................... ...... ................ ...... 4 <br /> <br />Map showing location of streamflow-gaging stations used to collect <br />channel-geomel;ry data and regional transition zone......................................... 5 <br /> <br />Graph showing example of a flood-frequency curve........................................... 7 <br /> <br />Map showing timr geographic-information-system maps that constitute a <br />digital representation of selected aspects of a drainage basin ........................11 <br /> <br />Map showing distribution of 2-year, 24-hour precipitation intensity for <br />Iowa and southern Minnesota...........................................................................13 <br /> <br />Block diagram of a typical stream channel......................................................20 <br /> <br />Photographs showing active-channel and bankfull reference levels at six <br />streamflow-gaging stations in Iowa .................................................................. 21 <br /> <br />Graphs showing relation between 2-year recurrence-interval discharge and <br />channel width for bankfull and active-channel width regression <br /> <br />equations............. .......................................... ..... ................................................28 <br /> <br />9. Graphs showing relation between 100-year recurrence-interval discharge <br />and channel width for bankfull and active-channel width regression <br /> <br />equations...................................,................................................... ..................... 29 <br /> <br />10. Graph showing bankfull cross section for Black Hawk Creek at Grundy <br /> <br />Center.............................. ................................................................................... 31 <br /> <br />iv ESTIMATING DESIGN-FLOOD DISCHARGES FOR STREAMS IN IOWA <br />