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FLOOD09911
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Last modified
1/26/2010 10:11:05 AM
Creation date
10/5/2006 4:44:10 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Culvert Design
Date
8/1/2000
Prepared By
Ayres Associates
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Lesson 2 <br /> <br />Basic Hydraulics - Participant Workbook <br /> <br />MANNING'S n Value <br /> <br />. SURFACE ROUGHNESS <br />. VEGETATIVE COVER <br />. SIZE AND SHAPE OF CHANNEL <br />. STAGE AND DISCHARGE <br />. SEASONAL CHANGE <br /> <br />2.28 Manning's n Value <br /> <br />The roughness coefficient "n" is significant in Manning's Equation and <br />varies with: <br /> <br />. surface roughness <br />. vegetative cover <br />. size and shape of channel <br />. stage and discharge <br />. seasonal change <br /> <br />b. Methods of n-value Assignment. <br /> <br />· Designers usually rely upon guide tables and experience <br /> <br /> <br />Roughness <br />Characteristics <br />of Natural Channels <br />..,,,,. "..~-, <br />""" -""..u,."""",,,,,, '" <br />k..",-'.. . <br />,,--,~^,~ , ",,,,,-,,,- ,~,,"~ <br /> <br />2.29a USGS Water Supply Paper 2339 <br /> <br />2.29b USGS Water Supply Paper 1849 <br /> <br />2-18 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />- <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />
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