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Last modified
1/25/2010 7:08:13 PM
Creation date
10/5/2006 2:05:54 AM
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Floodplain Documents
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State of Colorado
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Statewide
Title
Measurment of Peak Discharge at Culverts by Indirect Methods
Date
6/1/1968
Prepared By
G.L. Bodhaine
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />h, <br />h. <br />K <br />K. <br /> <br />Ko <br />k <br /> <br />SYMBOLS AND UNITS <br /> <br />- <br />A <br />A, <br />A, <br /> <br />lHfinitltm <br /> <br />Area. <br />Area of culvert ba1Tel. <br />Area of sec,ion of flow a.t critical <br />depth. <br />Width of contracted flow section <br />for box culvert. <br />Coefficient of discharge; also, <br />coefficient for computing various <br />culvert properties; subscripts <br />refer to specific items, as a for <br />area, k for conveyance, m for <br />mean depth, p for wetted perim- <br />eter, q (or discharge, r for hy- <br />draulic radiUf~, and t for top <br />width. <br />Maximum inside vertical dimen. <br />sion of culvert barrel, or the <br />inside diameter of a. circlllar <br />section. (For corrugated pipes, <br />D is measured a.s the minimum <br />inside diameter.) <br />Maximum inside diameter of pipe <br />culvert at entrance. <br />Depth of flow measured from the <br />lowest point in the cross section <br />for culverts. <br />Maximum depth in critical-flow <br />section. <br />Mean depth, <br />Froude number. <br />Gravitational constant (accel- <br />eration). <br />Specific energy. <br />Static or piezometric head above <br />an arbitrary datum. <br />dc+z for type 1 culvert flow. <br />Head los8 due to entrance con- <br />traction. <br />Head loss due to friction. <br />Velocity head at &. section. <br />Conveyance of a section. <br />Conveyance of critical depth <br />section. <br />Conveyance of full culvert barrel. <br />Adjustment factor; subscripts <br />refer to specific items, as a <br />for skewed abutments with <br />dikes, L for length, rand R for <br />radius, w for length of wing- <br />walls, and (J for wingwall angle. <br /> <br />b <br /> <br />c <br /> <br />D <br /> <br />Dm <br /> <br />d <br /> <br />d, <br /> <br />dm <br />F <br />. <br /> <br />H, <br />h <br /> <br />h, <br />Ii, <br /> <br />VIII <br /> <br />Unit <br />W <br />ft. <br />ft. <br /> <br />ft <br /> <br />ft <br /> <br />ft <br /> <br />ft <br /> <br />ft <br /> <br />ft <br /> <br />ft/sec' <br /> <br />ft <br />ft <br /> <br />1ft <br />ft <br /> <br />ft <br />ft <br />fV/sec <br />fV/sec <br /> <br />ft3/sec <br /> <br />L. <br /> <br />L. <br /> <br />m <br />n <br /> <br />n, <br /> <br />p <br /> <br />p. <br /> <br />Q <br />R <br />R, <br /> <br />r <br />S <br />S, <br /> <br />S, <br />T <br /> <br />v <br />V. <br />w <br /> <br />x <br />z <br /> <br />.., <br /> <br />" <br />8 <br /> <br />< <br />:!; <br />> <br />5: <br /> <br />Deftnitirm I "". <br />Length of culvert barrel, bridge ft <br />abutment, or broad-crested weir <br />in direction of flow. <br />Distance a culvert barrel projects <br />beyond a headwall or embank- <br />ment. <br />Distance from approach section <br />to entrance of culvert, up- <br />stream side of contraction, <br />or crest of weir. <br />Channel-contraction ratio. <br />Manning roughness of coefficient. <br />Composite value of roughness <br />coefficient. <br />Wetted perimeter of cross section <br />of flow. <br />Wetted perimeter of the paved <br />invert of a culvert. <br />Total discharge, <br />Hydraulic radius. <br />Hydraulic radius of & culvert <br />barrel. <br />RadiWl- of entrance rounding. <br />Friction slope. <br />Bed slope of culvert for wbich the <br />normal depth and the critical <br />depth ..... equal. <br />Bed slope of culvert barrel. I <br />Width of a. section at the water ft <br />surface. <br />Mean velocity of flow in a section. <br />Full culvert velocity. <br />Measure- of the length of a wing~ <br />wall or chamfer. <br />Length of part-full flow. <br />Eleva.tion of a. point above a <br />datum. <br />Subscripts which denote the loca- <br />~ tion of cross sections or section <br />properties in downstream order. <br />Velocity-head coefficient. <br />Acute angle between a wingwall <br />and plane of contraction or <br />headwall; and the bevel angle. <br />Less than. <br />Equal to or less than. <br />Greater than. <br />Equal to or greater than. <br /> <br />-,'" <br />L <br /> <br />ft <br /> <br />ft <br /> <br />ft1l8 <br />ftl/8 <br /> <br />ft <br /> <br />ft <br /> <br />Wlsec <br />ft <br />ft <br /> <br />ft <br /> <br />ft/sec <br />ft/sec <br />ft <br /> <br />ft <br />ft <br /> <br />e <br /> <br />. <br /> <br />e <br /> <br />.' <br /> <br />e <br />
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