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<br />" <br /> <br />GENERAL FLOW DIAGRAM <br />HEC SPECIAL BRIDGE ROUTINE <br /> <br />~ <br /> <br />I START : r DOES BRIDGE'NO r TEMPORAR IL Y ASSUME WATER OEPTH <br /> I HAYE PI ERS? I I IS SAllE AS PREYIOUS OEPnt <br /> YES <br /> CALCULATE WATER SURFACE ELEVATION CALCULATE EftERGY ELEVATION fOR <br /> ON OntER SIDE OF BRIDGE ASSUMING LOW FLOW DEPnt <br />. LOW FLOW CONTROL 'MAIN PROG.' <br /> '8LFLO ROUTINE' <br /> IS EftERGY ELEVATION fOR LOW ~ IS ENERGY ELEVATION ~ FLOW IS BY COMBINATION <br /> FLOW BELOW HIGHEST LOW CHORD FOR LOW FLOW ABOVE OF LOW FLOW AND WEIR "- <br /> ELEVATION? MINIMUM TOP ROAD? FLOW <br /> '&WEIR 6030' 'BWEI R 60110' 'SWEI R 6230' <br /> NO NO <br /> IS TAILWATER ABOVE NO DOES BRIOGE ~O RETURN TO MAIN PROGRAM AND CllK- <br /> NIGHEST LOW CHORD? HAVE PIERS? PUTE LOSSES DUE TO SKIN FRICTIOM <br /> '&WEIR 6160" II- "BWEIR 6050' BY NORMAL SACKWATER <br /> YES NO YES "&WEI R 6060' <br />" <br /> IS ntE ENERGY ELEVATION FOR PRESSURE LOW FLOW CONTROL <br /> FLOW ABOVE LOW FLOW EftERGY ELEVATION7 RETURN <br /> '&WEIR 6170" '&WEIR 6OS0" <br /> YES <br />. <br /> IS PROFILE BEING YES IS ENERGY ELEVATIOM FOR NO I PRESSURE <br /> COMPUTED FOR SUB- PRESSURE FLOW ABOVE MIN. -I FLOW CONTROLS <br /> CR I TI CAL FLOW? TOP ROADWAY? <br /> '&WEI R 6180' 'BWEI R 6190' <br /> -w- YES <br />'" <br /> ERRO R MESSAGE I COMBINATION OF PRESSURE I ENERGY ELEVATION IS OETERMINEO <br /> SUP ERCR I TI CAL AN D WE I R FLOW CONTROLS. I IN SUBROUTINE &WEIR. DEPnt MUST <br /> FLOW-PRESSURE BE DETERM I N ED FOR KNOWN Eft ERGY <br /> FLOW ELEVATION BY TRIAL AND ERROR IN <br /> 'SWEIR 6JllO" HAIN PROGRAM <br /> 'SWEI R 6Olll' <br /> <br />*Ret'ers to statement 6030 of computer program 22-J2-r.232 subroutine BWEIR. <br /> <br />FIGURE 7 <br />