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<br />References: USGS Professional Paper 2339, 1989, "Guide <br />to Selecting Roughness Coefficients f'Dr Natural Channels <br />and Floodplains," <br /> <br />FHWA-Ts-a4-204, 1984, <br />Roughness Coefficients <br />Floodplains.. " <br /> <br />"Guide for Selecting Manning's <br />for Natural Channeis and <br /> <br />b, Sand-bed channels <br /> <br />Manning's n changes with bed configuration. <br /> <br />13ED FORM <br /> <br />Plain bed Ripples <br /> <br />Dune. <br /> <br />Transition <br /> <br />StarwMg waves <br />and an1jdunes <br />--""'--.r-- <br /> <br />~.::.'.~: ..(.;'..~...'..,y <br />, 'I . " <br />.... <br /> <br />Water <br />~~ <br /> <br />Piau. bed <br /> <br />--- <br />~. <br /> <br />~~ <br />~~ <br /> <br />--..--- <br /> <br />~ <br /> <br />~~.-:~~;:- <br /> <br /> <br />Resistance 10 !low <br />(Mannino's rouQhness <br />coeUlcienl) <br /> <br />--'" <br /> <br />Lower regime <br /> <br />Transition <br /> <br />Up~)er regime <br />--""'-.....-- <br /> <br />STREAM POWER <br /> <br />RELATIVE RESISTANCE TO FLOW IN <br />SAND-BED CHANNEL.S <br /> <br />3,15 <br />