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<br />CONTENTS <br /> <br />Glossary---------------------------------------------------------________ <br />Abstract-------------------------------------------------------------____ <br />lntroduction--------------------------------------------------------_____ <br />Purpose and scope--------------------------------------------------- <br />Acknowledgments----------------------------------------------------- <br />Hydraulic analysis-------------------------------------------------- <br />Manning equation--------------------------------------------------__ <br />Limitations-------------------------------------------------------------- <br />Cross sections----------------------------------------------------------- <br />Location-----------------------------------------------------------_ <br />Reach length-------------------------------------------------------- <br />Subdivision--------------------------------------------------------- <br />Roughness coefficients--------------------------------------------------- <br />General approach---------------------------------------------------- <br />Base value---------------------------------------------------------- <br />Particle size-------------------------------------------------- <br />Channel gradient----------------------------------------------- <br />Depth of flow-------------------------------------------------- <br />Sediment load-------------------------------------------------- <br />Adjustment factors-----------------------------------------------___ <br />Cross-section irregularities, nt------------------------------- <br />Channel variations, n2----------------------------------------- <br />Obstructions, n3----------------------------------------------- <br />Channel vegetation, n4----------------------------------------- <br />Degree of meandering, m---------------------------------------- <br />Channel flow resistance-------------------------------------------------- <br />Natural channels---------------------------------------------------- <br />Sand-bed channels---------------------------------------------- <br />Stable channels------------------------------------------------ <br />Equation for predicting roughness coefficients of lower- <br />gradient natural channels------------------------------- <br />Equation for predicting roughness coefficients of higher- <br />gradient natural channels------------------------------- <br />Modified channels--------------------------------------------------- <br />Overbank flow resistance------------------------------------------------- <br />Natural overbanks--------------------------------------------------- <br />Agricultural overbanks---------------------------------------------- <br />Urban overbanks----------------------------------------------------- <br />Procedure for assigning n values----------------------------------------- <br />Example I--Natural channel------------------------------------------ <br />Example 2--Natural flood plain-------------------------------------- <br />Example 3--Agricultural flood plain--------------------------------- <br />Example 4--Urban flood plain---------------------------------------- <br />Summary------------------------------------------------------------------ <br />References cited--------------------------------------------------------- <br /> <br />iii <br /> <br />Page <br />v <br />1 <br />1 <br />1 <br />1 <br />2 <br />2 <br />3 <br />5 <br />5 <br />7 <br />7 <br />12 <br />12 <br />13 <br />13 <br />14 <br />14 <br />15 <br />15 <br />15 <br />18 <br />18 <br />18 <br />19 <br />19 <br />19 <br />19 <br />21 <br /> <br />21 <br /> <br />23 <br />37 <br />38 <br />39 <br />41 <br />42 <br />45 <br />47 <br />48 <br />50 <br />51 <br />52 <br />53 <br />