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<br />LIST OF FIGURES <br /> <br />Page <br /> <br />Figure 1. GraJ:*l showing relation of stream power and median <br />grain size to flow regime----------------------------- 6 <br />2. Forms of bed roughness in sand-bed channels------------- 7 <br />3. Plot of effective-drag coefficient versus hydraulic <br />radius for wide, wooded flood plains using verified <br />n values---------------------------------------------- 19 <br />4. Example measurement of vegetation density of repre- <br />sentative sample area--------------------------------- 21 <br />5. Example of determination of Manning's n by direct <br />technique of vegetation density----------------------- 22 <br />6-20. Photograph showing flood plains having verified n values: <br />6. Cypress Creek near Downsville, La., n=O.lO------- 24 <br />7. Bayou de Loutre near Farmerville, La., n=O.ll---- 25 <br />8. Bayou de Loutre near Farmerville, La., n=O.ll---- 26 <br />9. Bayou de Loutre near Farmerville, La., n=O.ll---- 27 <br />10. Coldwater River near Red Banks, Miss., n=O.ll---- 28 <br />11. Coldwater River near Red Banks, Miss., n=O.ll---- 29 <br />12. Yockanookany River near Thomastown, Miss., <br />n=0.12----------------------------------------- 30 <br />13. Yockanookany River near Thomastown, Miss., <br />n=0.12----------------------------------------- 31 <br />14. Flagon Bayou near Libuse, La., n=0.13----------- 32 <br />15. Pea Creek near Louisville, Ala., n=O.14---------- 33 <br />16. Pea Creek near Louisville, Ala., n=0.14---------- 34 <br />17. Tenmile Creek near Elizabeth, La., n=0.15-------- 35 <br />18. Sixmile Creek near Sugartown, La., n=0.18-------- 36 <br />19. Thompson Creek near Clara, Miss., n=0.20--------- 37 <br />20. Thompson Creek near Clara, Miss., n=O.20--------- 38 <br />21. Flow chart of procedures for assigning n values--------- 40 <br />22. Sample form for computing n values---------------------- 42 <br />23. Sketch of a hypothetical cross section showing reaches, <br />segments, and subsections used in assigning n values-- 47 <br /> <br />LIST OF TABLES <br /> <br />Table 1. <br />2. <br />3. <br />4. <br /> <br />Base values of Manning's n------------------------------ <br />Factors that affect roughness of the channel------------ <br />Factors that affect roughness of flood plains----------- <br />Outline and example of procedures for determining n <br />values for a hypothetical channel and flood plain----- <br /> <br />4 <br />9 <br />14 <br /> <br />52 <br /> <br />iii <br />