(Answered): Consider the corrugated metal pipe culvert: with diameter 24inches, length of 160 feet with a slope ...

For the culvert and flow conditions described, assume outlet-control conditions and determine the headwater elevation, HWo. Assume the culvert is flowing full with the tail water elevation above the culvert outlet. Use the FHWA chart for outlet-control conditions and use the outlet- control design equation given above; neglect the upstream and downstream velocity head terms. Show your work on the chart for full credit. Assume inlet-control conditions for the culvert and flow conditions described and determine the headwater depth HW, and the headwater elevation HWo using the FHWA inlet-control chart provided. Show your work on the chart for full credit. Which condition determines the culvert design, (a) the outlet control, or (b) the inlet control condition? Explain why. The 6B design chart is constructed for design of a culvert with roughness n 0.024. Determine the equivalent length L, that would allow use of the 68 design chart for a culvert with roughness n 0.03. o,000 ,co0 6,000 5,000 4,000 3,000 80 EXAMPL? 56 144 32 20 D 36 inches (3.0 feet) Q 66 cfs 2,000 1.8 (2) 2.1 5.4 6.3 6.6 (3) 2.2 D in feet 800 600 500 1.5 200 1.5 1,5 a10 8o 48 60 1,0 42 1.0 SCALE ENTRANCE TYPE 233 20 Mitered to conform to slope io 21 To use scale (2) or (3) project horizontally to scale (1), then use straight inclined lint through D and Q scales, or reverse as 2 ustrated HEADWATER DEPTH FOR C. M. PIPE CULVERTS WITH INLET CONTROL BUREAU OF PUBLIC ROADS JAN. 1963 o00 ope So-. SUBMERGED OUTLET CULVERT FLOWING FULL 600 500 400 For outlet crown not submerged, compute Hw by methods descrbed in the design procedure 300 84 72 200 0 60 54 48 42 ? -50 O36 30 ??27 10 20 24 400 I 8 HEAD FOR STANDARD G. M. PIPE CULVERTS FLOWING FULL BUREAU OF PUBLIC ROADS JAN. 1963