Laserfiche WebLink
<br />It! <br /> <br />FLOW DIAGRAM FOR COMPUTING PROFILES <br />FOR <br />COMBINATION OF WEIR FLOW AND ORIFICE (OR LOW) FLOW <br />HEC COMPUTER PROGRAM 22-J2-L232 <br />FEBRUARY 1969 <br /> <br /> CALQJLATE 01 SCHARGE UNDER BRIDGE BY -- <br /> MAKE IN ITlAL ESTIMATE OF ENERGY ElE- <br /> ORIFICE EQUATIOll VATlON <br /> 6UO 621j()-6270 <br /> j I <br /> INITIALIZE WEIR FLOW TO ZERO I ~ I S FLOW A COMBINATION OF WEI R AND <br /> 61120 I ORIFICE AND NOT WEIR AND LOW FLOW? - <br /> . I 6300 <br /> NO <br /> CALQJLATE HEAD, WEI R LENGTH FOR FI RST <br /> ROADWAY SEGMENT WICH IS 8ElOW THE <br /> ASSUMED ENERGY ElEVATION <br /> 6430-61150 MAKE INITIAL ESTIMATE OF DISCHARGE <br /> t PASSING UNOER BRIDGE (CHANNEl Q) <br /> 6'10 <br /> CALQJLATE SUBMERGENCE WEI R COEFFICI ENT I <br /> RlR ROAOWAY SEGMENT <br /> 6llBO CALQJLATE DOWNSTREN4 VElOCITY HEAD <br /> I USING ASSUHED CHANNEL Q AND PRE- <br /> VIOUS AREA <br /> CALQJLATE DISCHARGE OVER WEIR SEGMENT <br /> AND ADD TO PREVIOUS WEI R 01 SCHARGES CALCULATE UPSTREAM WATER ElEVATION <br /> 651j() BASED ON YARNELL'S ENERGY EQUATION <br /> t CALCULATE UPSTREAM VELOCI TY HEAD <br /> PROCEED TO NEXT ROADWAY SEGMENT I FROM ASSUMED ENERGY AND CALCULATED <br /> 6580 WATER SURFACE ELEVATION <br /> j. INCREASE ENERGY ElEVATlOll TO .1 FT <br /> ABOVE UPSTREN1 WATER SURFACE IF <br /> IS END OF ROADWAY SEGMENT ABOVE ASSUMED YES VELOCITY HEAD WAS NEGATIVE <br /> ENERGY ELEVATIOll? - j <br /> 6590 <br /> NO I CALCULATE UPSTREAM: <br /> VELOCI TY FR()I VElOCITY HEAD. <br /> CALCULATE HEAD AND WE'R LENGTH FOR SEG- AREA FROM DEPTH. <br /> MENT OF ROADwAY 01 SCHARGE FR()I AREA AND VElOCITY <br /> 6610 <br /> ARE ANY OF REMAIH ING ROADWAY ELEVATIONS - ~ ARE ASSUMED AND COMPUTED CHANNEL Q <br /> BElOW ASSUMED ENERGY ElEVATION? :=-YES WITHIN ONE PERCENT? <br /> 6630 NO NO L <br /> YES t . <br /> CALCULATE NEW STARTING HEAD AND WEI R MAKE NEW ASSUHPTI ON OF CHANN El Q f- <br /> LENGTH 6:lB0 <br /> 6670 <br /> ADD DISCHARGES FOR WEIR ANO ORIFICE (OR - <br /> LOW FLOW) TO OBTAIN CGMPUTED OISCHARGE <br /> FOR ASSUMED ENERGY ELEVATION <br /> I <br />YES IS COMPUTED DISCHARGE WITHIN ONE PERCENT <br />OF AClUAL DISCHARGE? <br /> 6700 <br /> NO t <br /> MAKE NEW ASSUMPTlOll OF ENERGY ElEVATION I <br /> 6720-6790 I <br /> ACCEPT ENERGY ElEVATION, SOLVE FOR COR- END I <br /> RECT WATER SURFACE ElEVATION IN MAIN <br /> PROGRAH <br /> 6B2O <br /> <br />Lllllil <br />. <br /> <br />~ <br /> <br />. <br /> <br />FIGURE 8 <br />