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<br />Figure 1. <br />2. <br /> <br />10-12. <br /> <br />Table l. <br /> 2. <br /> 3. <br /> 4. <br /> 5. <br /> 6. <br /> 7. <br /> <br />ILLUSTRATIONS <br /> <br />3. <br />4. <br /> <br />Definition sketch of an open-channel flow reach------------- <br />Plan view of a hypothetical channel and flood plain <br />showing types of reaches, subareas used in assigning <br />n values, and location of cross sections------------------ <br />Cross sections of a hypothetical channel and flood plain---- <br />Cross section of a hypothetical channel and flood plain <br />showing subdivisions based on geometry and roughness------ <br />Graph showing relation of stream power and median grain <br />size to type of regime flow------------------------------- <br />Map showing location of n-verification sites----------------- <br />Photographs showing: <br />7. Downstream view of Trout Creek near Oak Creek: A, <br />at low flow; B, at high flow------------------------- <br />8. Upstream view of Lake Creek above Twin Lakes <br />Reservoir: A, at low flow; B, at high flow---------- <br />9. Upstream view of Arkansas River at Pine Creek <br />School, above Buena Vista: A, at low flow; B at <br />high flow------------------------------------------- <br />Graphs showing: <br />10. Relation between Manning's roughness coefficient <br />and hydraulic radius----------------------------- <br />11. Effect of streambank vegetation on the relation <br />between Manning's roughness coefficient and <br />hydraulic radius--------------------------------- <br />12. Relation between Manning's roughness coefficient <br />and friction slope and hydraulic radius---------- <br />Plan view and cross section of an urban area in which <br />streets are either parallel or perpendicular to the <br />direction of flow----------------------------------------- <br />Sample roughness-coefficient evaluation form---------------- <br />Sample of a completed roughness-coefficient evaluation <br />form for a natural flood plain---------------------------- <br /> <br />5. <br /> <br />6. <br />7-9. <br /> <br />13. <br /> <br />14A. <br />148. <br /> <br />TABLES <br /> <br />Page <br />4 <br /> <br />8 <br />9 <br /> <br />11 <br /> <br />22 <br />24 <br /> <br />25 <br /> <br />26 <br /> <br />27 <br /> <br />32 <br /> <br />33 <br /> <br />36 <br /> <br />43 <br />46 <br /> <br />49 <br /> <br />Page <br /> <br />Adjustment factors for the determination of n values for <br />the entire channel------------------------------------------ 16 <br />Base values of the Manning's n for natural channels----------- 20 <br />Summary of basic data and results of using the prediction <br />equation for Colorado streams------------------------------- 29 <br />Correlation coefficients for selected hydraulic <br />characteristics--------------------------------------------- 34 <br />Base values of n for modified channels------------------------ 37 <br />Values of n for different types of vegetation on overbank <br />areas------------------------------------------------------- 40 <br />Sample values of n for agricultural overbank areas under <br />various stages for the average growing season--------------- 41 <br /> <br />iv <br />