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<br />Qc <br />Qd <br /> <br />Qo <br /> <br />Qp <br />Qr <br /> <br />Q~ <br /> <br />Q60 <br />R <br /> <br />Rio <br />RIF <br />RCP <br /> <br />s <br /> <br />S <br /> <br />S. <br /> <br />Sf <br /> <br />Sn <br /> <br />So <br /> <br />t <br /> <br />ti <br /> <br />tp <br />T <br /> <br />Tc <br /> <br />Tp <br />TAPER <br /> <br />TW <br />V <br />Vd <br />Vg <br />Vo <br />Vu <br /> <br />w <br /> <br />GLOSSARY (Cont.) <br /> <br />~ <br />'1 <br />1 <br />" <br />j <br />, <br />j <br />~ <br />~ <br />i <br />I <br />I <br />I <br />~ <br />~ <br />" <br />~ <br />i <br />1 <br />l <br />I <br />1 <br />j <br />, <br />~ <br />j <br />. <br />I <br />1 <br />~ <br />1 <br /> <br />Discharge at critical depth. fta Is <br />Design discharge. fta Is <br />Discharge over total length of embankment, fta/s <br />Peak flow rate. fta/s <br />Routed (reduced) peak flow. fta/s <br />Total of Qb + Qo. fta/s <br />Discharge for 50-year return period (similar for other return periods). fta/s <br />Hydraulic radius = cross-sectional area of flow through culvert or channel <br />divided by wetter perimeter. ft <br />Rainfall runoff. fta <br />Rainfall. in <br />Reinforced concrete pipe <br />Storage in a storage basin. fta <br />Slope of culvert barrel. ft/ft <br />Slope of embankment or face of excavation, expressed as S.:l. <br />horizontal:vertical. ft/ft <br />Slope of fall at culvert iulet, expressed as Sil, horizontal:vertical. ftlft <br />Friction slope of full flow HGL. ftlft <br />Slope of channel bed. ftlft <br /> <br />. <br />~ <br />1 <br />1 <br />~ <br />. <br /> <br />Time. min or see <br />Time of concentration for Rational equation, min <br />Time to peak of a runoff hydrograph. min or see <br />Depth of depression, ft <br />Rainfall duration. min <br />Critical storm duration. min <br />Top width of flow prism. ft <br />Cotangent of angle of sidewalls in tapered inlet with respect to an extension <br />of the culvert sidewalls. ft/ft. <br />Tailwatcr depth measured from culvert outlet invert, ft <br />Mean velocity of flow. ftls <br />Channel velocity downstream of culvert. ftls <br />Velocity of flow between bars in a grate. ftls <br />Velocity at outlet of culvert. ftls <br />Approach velocity upstream of culvert. ft/s <br />Maximum cross-sectional width of the bars facing the flow. ft <br /> <br />1 <br />~ <br />~ <br />. <br />f <br />, <br /> <br />j <br />.. <br />.. <br />. <br />, <br />j <br /> <br />. <br /> <br />xviii <br />