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<br /> <br />32 TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS <br /> 0,09 -e <br /> n-li <br /> ~ <br /> i ->- ~ M;;fh. wf <br /> 0,08 <br /> '" -'-rli-:---.s ~ <br /> 0 <br /> 0 ~ Datum 0 <br /> II <br /> >=10 r W ' <br /> <Ie o' 1):0,04 <br /> 0.07 ----- <br /> ",.- - <br /> /" <br /> 1 <br /> 0,06 I <br /> I <br /> I <br />~ 0.05 I <br />W I <br />0- f !.._. W:;::;:Q,03 <br />0 D D <br />..J <br />'" , <br />a I /-- <br />"' <br />'" 0,04 I / <br /> I / <br /> I / <br /> I -e <br /> 0,03 <br /> -I-. W=OO2 <br /> , D D ' <br /> I Type 5 Type 6 <br /> /' <br /> 0,02 / <br /> J ,W <br /> I / 0',,:0,01 <br /> 0,01 I I / r Wi <br /> I / -.-:0 <br /> o 0 <br /> 0 ! I j// <br /> 0 10 20 30 <br /> 1 <br /> 0 <br /> <br />Figure 1S.-Criterion for c1assjfying types 5 and 6 flow in box or pipe culverts with concrefe barrels and square, <br />rounded, or beveled entrances, either with or without wingwalls. <br /> <br />2, Variation in cross-sectional dimensions <br />through the cui vert barrel. <br />3, Nonuniform slope, break in slope along the <br />culvert barrel, or severe adverse slope. <br />The standard equations, 5, 7-11, may all be <br />derived by writing the Bernoulli (energy) equa- <br />tion between the control section and the ap- <br /> <br />proach section, The routing procedure is a <br />method whereby the energy equation is solved <br />by the following procedures: <br />1. For flow types 1 and 2 (flow at critical <br />depth), assume a critical depth of flow at <br />the control section, compute the corre- <br />sponding discharge, thm route the energy <br /> <br />-e <br />