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<br />I <br />I <br />1 <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 /> <br /> <br />CITY OF GREENWOOD VILLAGE <br />STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA CODE <br /> <br />TABLE 6a <br /> <br />MANNINGS n -VALUES <br />FOR STORM SEWERS AND CULVERTS <br /> <br />A. Corrugatt'd Hetal Pipe - Stec-l <br /> <br /> Annular Helical <br />COtfUlltions 21S-. K- IK-l H...... 2WrW <br /> All Oi.... r 10' 17 lr 24' 36' ... <br /> ----- <br />UlI/l<1ved .024 .012 .014 .011 .014 .016 .01' .020 <br />25:' P.ved .021 .015 .017 .010 <br />r. , ""'ed .012 .012 .012 .012 <br /> Annular H.licrl-J' . r <br />COf/UlationJ 3' ai' <br /> AlIDi.... 36' ... ttw fP 71' <br />Unpaved .027 .021 .02] .023 .024 .025 .026 <br />25~ Pawed .02] .01' .020 .0lO .021 .Q22 .022 <br />Fully PlYed .012 .012 .012 .012 .~ .012 .012 <br /> <br />B. Structural Plate Hetal Pipe - Steel <br /> <br />Olf/uptions <br />" r7 <br /> <br />Di....lm <br />711 lOll <br />.Q32 .030 <br />.027 .026 <br /> <br />1511 <br />.021 <br />.Il24 <br /> <br />511 <br />.lll3 <br />.021 <br /> <br />Pb~.".ved <br />25~ PlYed <br /> <br />C. Concrete Pipe/Culvert <br /> <br />TYPE ~-VALUE <br /> <br />Pre-Cast 0.012 <br />Cast-in-Place <br /> <br />With Steel Forms <br />Wi th Wood Forms <br /> <br />0.013 <br />0.015 <br /> <br />NOTE: Manning's Equation is <br /> <br />Q = 1.4Y AR2/3 S 1/2 <br /> <br />n <br />where Q is flow in cfs, n is the Manning's roughness coef ficient, <br />A is the flow area in square leet, R is the hydraulic radius in <br />feet, and S is the slope of the energy grade line in ft/ft. <br /> <br />Continued on next page <br /> <br />WRC, INC. <br />Sept. 1982 <br /> <br />REFERENCE: <br /> <br />''Handbook of S tee 1. Ora inage and Highway <br />Construction Products" AISI, 1971 <br />