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<br />. <br /> <br />~ <br />~ <br />t <br />t <br />~ <br />~ <br />t <br />~ <br />. <br />. <br />~ <br />. <br />~ <br />. <br />t <br />~ <br />. <br />t <br />\ <br />. <br />~ <br />\ <br />. <br />~ <br />~ <br />. <br /> <br />GLOSSARY (Cont.) <br /> <br />, <br />~ <br />~ <br />. <br />. <br />. <br /> <br />HWd Design headwater depth, ft <br />HWj Headwater depth above inlet control section invert, ft <br />HWf Headwater depth above the culvert inlet face invert, ft <br />HWo Headwater depth above the culvert outlet invert, ft <br />HWr Total head of flow over embankment, ft (Measured from roadway crest to up- <br />stream surface level.) <br />HW, Depth from throat invert to upstream total energy grade line, ft <br />I Rate of inflow into a storage basin, fts/s <br />Rainfall intensity, in/hr <br />k Flow constant for an orifice, Q = kaho.s, fto,s/s <br />k. Entrance loss coefficient <br />k, Correction factor for downstream submergence during roadway overtopping <br />K Coefficient for unsubmerged inlet control equation <br />Kb Dimensionless effective pressure term for bend section control <br />Kf Dimensionless effective pressure term for inlet face section control <br />K. Dimensionless bar shape factor for calculating grate head losses <br />K, Dimensionless effective pressure term for inlet throat control <br />L Actual culvert length, ft <br />L. Approximate length of culvert, including tapered inlet, but excluding wing- <br />walls, ft <br />Lr Width of roadway prism crest, ft <br />Ll' Lz, Dimensions relating to tapered inlets, ft <br />Ls, L( <br />M Exponent in unsubmerged inlet control equation <br />n Manning roughness coefficient <br />ii Weighted Manning n value <br />N Number of barrels <br />o Rate of outflow from a storage basin, ft3/s <br />p Wetted perimeter, ft <br />Pf Wetted perimeter of tapered inlet face, ft <br />P, Wetted perimeter of tapered inlet throat, ft <br />P Length from crest of depression to face of culvert, ft <br />qo Discharge over segment of embankment, ft3/S <br />Q Discharge, ft3/s <br />Qb Flow through culvert as opposed to flow over embankment, ft3/S <br /> <br />t <br />t <br />~ <br />, <br /> <br />t <br />~, <br />~ <br />~ <br />t <br />r <br />~ <br />. <br />~ <br />. <br />. <br />t <br />r <br /> <br />, <br /> <br />~ <br />~ <br />t <br />~ <br /> <br />xvii <br />