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<br />2-77 <br /> <br />GENERAL FLOW DIAGRAM <br />SPECIAL BRIDGE METHOD <br /> <br />STAR <br /> <br />illES BRIUG<' <br />IiAYE PIERSl <br />YEI <br />CALWLATt: WATER SURFACE ELEVATION <br />0.. OTHt;.R Slot:. OF 6RILJGE ASSUMIl4G <br />LOW FLOW EOtlTlf)L ~UBPROGIWl BLFl <br /> <br /> <br />NO <br /> <br />S THE ASS <ED LOW FLOW <br />WATER SURFACE ELEYATION <br />ABOYE THE HlNIMUM TOP OF VEl <br />ROAm/AY (Is THEIlE WEIR 1 <br />FLOWl S'. <br /> <br /> <br />E ErlERGY ELEY. . ASSU"'D <br />WATER ELEYATION PLUS PREYIOUS <br />SECTION VELOCITY HEAD (OUTSIDE <br />BRIUGE , lB20' <br /> <br />IS u.S. EI~ERGY HEV. F R <br />Y E lOW flOW I'iliUVi:. HIGHEST U.S. <br />LUW CHURu i:.lLYATIuj~l <br /> <br /> <br />IS ENERGY ELEYATION <br />FOR LOW FlllW ABOVE Y <br />MUiJK.lM TOP ROAOl <br />1830 <br /> <br />IlETU~' TO MAIN PROGRAM ANO COMPUTE <br />luSSES iJUE TO SKill FRICT10Jl 6Y <br />. RHA IlACKWATER. 1840 <br /> <br />vEl <br /> <br /> <br />FLOW IS BY COllllliATlON <br />OF LOll FLOW AIID WEIR <br />flOW, 19 <br /> <br />NO <br /> <br />IS lb FOR lOW lUlu' <br />Wllk flOW L~SS THAN <br />LLLCl 237S,1 <br />o <br />COMPUTE EG FOR <br />PRESSURE ~~u WEIR <br />f1.0W, 1970 <br /> <br />1~ nII,IUJN TOP OF ROA[)I.MY <br />cLtVATI~l AouVE THE <br />HIbHlST u.S. lOW CHORU <br />ELt;.VATIOiil <br /> <br />NO <br /> <br />YES <br /> <br />IS THl t.1\iRGY EUVATIOJj <br />FOR LOw fLOW AJ)uYE <br />1.~XH1UH biEkGY FOR lOW <br />FLOW (~RITICAl O[PTH)l <br /> <br />o <br /> <br />IS THl ElttRGY lLEYATION FOR PRESSUR[ <br />flOW AUOYE luW Fla. lNERGY lllYATIOHl <br /> <br />COMPARE EG FOR PRESSURE <br />Ai.tO WE.I R AND lOW AHD <br />WEIR f1.0II. HIGHER EG <br />EOHTROLS. 23BO <br /> <br />yES <br /> <br />YES <br />IS PI\OFILI:. 1:U:JIUi. <br />ClJl-iPL"Tiu FOR SW- <br />l.klTlL..Al FlIJWl <br />1925 <br /> <br /> <br />YES <br /> <br />IS EIU.RGY ElEVATIUI~ FOR <br />PRESSUR[ flOW AdOVE HIN. <br />T ROADWAY? 194 <br /> <br />PRESSURE <br />flOW CONTROLS <br /> <br />NO <br />Ul.lWl\ I'it.SSillit. <br />Sul'LR~I<ITICAl. <br />Fluw-PkLSSlJRt <br />Flu'" <br /> <br /> <br />ENERGY ELEVATION IS <br />lJ[TERMINED IN suaRourmE <br />BWEIR. DEPTH MUST BE <br />DETERMINED FOR KNOWN <br />ENERGY ELEVATION BY TRIAL <br />ANiJ ERJl)R IN '~IN PROGJW1. <br />1810 <br /> <br />1925 <br /> <br />.Number~ refer to statement nuntlers in subprogram BWEIR. <br /> <br />Figure 3 <br /> <br />10 <br />