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<br />e <br /> <br />. <br /> <br />- <br />. <br /> <br />e <br /> <br />. <br /> <br />,.. <br />~ <br /> <br />e <br /> <br />Symbol <br /> <br />HWt <br /> <br />ho <br /> <br />K <br /> <br />ke <br /> <br />kb <br /> <br />kf <br /> <br />kt <br /> <br />La <br /> <br />Ll> LZ' L3, L4 <br /> <br />N <br /> <br />n <br /> <br />P <br /> <br />Q <br /> <br />R <br /> <br />S <br /> <br />Se <br /> <br />Units <br /> <br />ft. <br /> <br />ft. <br /> <br />ft. <br /> <br />ft. <br /> <br />ft. <br /> <br />cu. ft. Isec. <br /> <br />ft. <br /> <br />ft. 1ft. <br /> <br />ft. 1ft. <br /> <br />Description <br /> <br />Headwater elevation required for <br />flow to pass throat section in <br />throat control <br /> <br />Elevation of equivalent <br />hydraulic grade line refer- <br />enced to the outlet invert <br /> <br />A constant relating to free surface <br />nonsubmerged entrance flow <br /> <br />Entrance energy loss coefficient <br /> <br />A dimensionless effective <br />pressure term for bend section <br />control <br /> <br />A dimensionless effective <br />pressure term for inlet face <br />section control <br /> <br />A dimensionless effective <br />pressure term for inlet <br />throat control <br /> <br />Approximate total length of <br />culvert, including inlet <br /> <br />Dimensions relating to the <br />improved inlet as shown in <br />sketches of the different types <br />of inlets <br /> <br />Number of barrels <br /> <br />Manning roughness coefficient <br /> <br />Length of depression <br /> <br />Volume rate of flow <br /> <br />Hydraulic radius = Area <br />Wetted Perimeter <br /> <br />Slope of culvert barrel <br /> <br />Slope of embankment <br /> <br />ix <br />