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i• • <br />Appendix <br />FI of <br />channel material n <br />.clean, uncoated cast iron <br />0.013-0.015 <br />-clean, coated cast iron <br />0.012-0.014 <br />dirty, tuberculated cast iron <br />0.015-0.035 <br />riveted steel <br />0.015-0.017 <br />lock -bar and welded <br />0.012-0.013 <br />galvanized iron <br />0.015-0.017 <br />brass. and glass <br />0.009-0.013 <br />wood stave <br />Earth, winding, no' vegetation_ <br />small diameter <br />0.011-0.012 <br />large diameter <br />0.012-0.013 <br />concrete <br />with rough_joints <br />0.016-0.017 <br />dry mix, rough forms <br />0.015-0.016 <br />wet mix, steel forms <br />0.012-0.014 <br />ver- smnnth nis_ hed <br />0.011-0.012 <br />.Vitrified sewer <br />0.013-0.015 <br />common -clay drainage tile <br />0.012-0.014 <br />-.asbestos <br />0.011 <br />planed timber <br />0.011 <br />;canvas <br />0.012 <br />,unplaned timber <br />0.014 <br />•brick <br />0.016 <br />'rubble masonry <br />0.017 <br />., smooth earth- <br />0.018 <br />firm gravel <br />0.023 <br />corrugated metal pi-ne� <br />0.022 <br />_ <br />- natural channels, good condition 0.025 <br />natural channels with stones and weeds <br />0.0_35 <br />i very poor natuial clialine '� <br />' OA60M <br />TABLE 10-3 TYPICAL VALUES OF THE ROUGHNESS COEFFICIENT a <br />Lined Canals n <br />Cement plaster 0.011 <br />Untreated gunite 0.016 y <br />Wood, planed 0.012 . <br />Ki,jD Wood, enplaned 0.013 <br />Concrete, troweled 0.012 <br />5-23 <br />Concrete, wood forms, unfinished 0.015 <br />Rubble in cement 0.020 s <br />q; 3$ Asphalt, smooth 0.013 <br />A hal h <br />sp t, roug <br />0.016 <br />O <br />Natural Channels <br />Gravel beds, straight <br />0.025 <br />., <br />Gravel beds plus large bo u ers <br />0040 <br />Ebkt ,til strai t, with some grass <br />Earth, winding, no' vegetation_ <br />0.030 <br />Earth, win mg <br />�: 0.050'K <br />J <br />U, <br />Z <br />Z <br />s <br />U <br />Z <br />a. <br />O <br />�► s <br />