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<br />Examole Problem No.4
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<br />An existing 7 ft by 7 ft concrete box
<br />culvert was designed for a SO-year flood
<br />of 600 ft3js and a design headwater eleva-
<br />tion of 114 ft. Upstream development
<br />has increased the SO-year runoff to 1,000
<br />ft3jS. The roadway is gravel with a
<br />width of 40 ft. The roadway profile may
<br />be approximated as a broad crested weir
<br />200 ft long. Use figure III-II to
<br />calculate overtopping flows, and the
<br />following site data:
<br />
<br />Flow, ft3js TW, ft
<br />400 2,6
<br />600 3.1
<br />SOO 3.8
<br />1000 4.1
<br />
<br />Culvert Length: 200 ft
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<br />
<br />Tailwater Information
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<br />Inle! Invert Elevation: 100 ft
<br />
<br />Entrance Condition: Square Edges
<br />
<br />Prepare a performance curve for this
<br />installation, including any roadway over-
<br />topping, up to a flow rate of 1,200 ft 3 js.
<br />
<br />Slope: S percent
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<br />Roadway Centerline Elevation: 116 ft
<br />
<br />NOTE: Charts S, 14, and IS, and figure
<br />III-ll are used in this solution.
<br />
<br /> ExAMPLe P1l.08"" 110, L- STATION :~9_.__ _ I~ULVERT DESIGN FORM
<br />"ItO"~CT : ,I ~[$IGIIER/O"Tf. W '-:/f!f-
<br />CfiA 9f!f l!!. #05 NO,S $MEET I ., 3 : REVIEWER/O"TE-~/J!11-
<br /> f1YlllllOLOGICAl. OArA J1ll ~Y:ON Jl~,_:"l
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<br />.. O,"(TIIO!) see; .. L _ ~-=,rH
<br />=. 0 oRIl,,,..u..,,,u:4ooAc.o S'IIUllll'Sl.OPE_~
<br />! 0 C_....l~S.....I'(: n<'APEZOrOA.1. - J~' . it'lL.. _tan.a, . (1.1 So. . ~! I.. .
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<br /> SOo II., U, /H - 1I~.5 U n 7,0 7,0 H 101..' IIG" - -
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<br />COMMtNTS
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