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GENERAL PROGRAM LOGIC HEC SUBROUTINE BLFLO 'SPECIAL BRIDGE ROUTINE LOW FLOW CONTROL (TRAPEZOIDAL CHANNEL) CALQJLATE CRI TI CAl DEPTH DUTSI DE BRI DGE CONSTRI CTION 5090* t CAlQJLATE CRITICAl DEPTH WITHIN BRIDGE CONSTRICTION 5170 t CAlQJLATE KlMEllTUM WITHIN BRIDGE FOR CRITICAl DEPTH 5170 t YES lIS SUBCRITlCAL flOW ASSUMED INSTEAD OF SUPERCRITICAl flOW? I NO I 5200 I l . . IS MOMEllTUM IN CONSTRICTION BASED ON DOWN STREAK DEPTH IS MOMEllTUM IN CONSTRICTION BASED ON UPSTREAM DEPTH GREATER THAN CRITICAL MOMENTUM WITHIN BRIDGE? GREATER THAN CRITICAl MOMENTUM AT BRIDGE? 5210 52110 VRC: t . tNO tyJ>O t '" CAlQJLATE UPSTREAM WATER WATER DEPTH IN BRIDGE= SOLVE FOR DEPTH (CLASS Cl WATER DEPTH IN BRI DGE= SURFACE EL. BY YARNelL CRITICAL; CLASS B flOW IN BRIDGE WHICH HAS HOMEN- CRITICll; CLASS 8 FLOW EN ERGY EQ. FOR ClASS A 5225 TUM EQUAL TO MOMENTUM WITH- -- 5270 flOW I IN CONSTRICTION BASED ON . 5220 UPSTREAM DEPTH t SOLVE FOR NEW DOWNSTREAM 5~0-5_10. 5260 SOLVE FOR NEW UPSTREAM SOLVE FOR DEPTH IN BRIDGE DEPTH (LESS THAN CRITICAL) t DEPTH (ABOVE CRITICAL) WH I CH HAS MOMENTUM EQUAl BASED ON CRITICAl MOMENTUM BASED 011 CRITICAL Ho-- TO HOMENTUM WITHIN CON- AT BRIDGE SOLVE FOR DOWN STREAK DEPTH HENTUH AT BRIDGE STRICTION BASED ON DOWN- 5~0-5_10, 5226 (LESS THAN CRITICAL) WHICN 5300-5_10, 5280 STREAM DEPTH t HAS MOMElllUH WI TH I N CON- , 5~0-5_10. 51180 STRICTION BASED ON UPSTREAK t PRINT NOTE: DOWNSTREAM DEPTH PRINT NOTE: UPSTREAM DEPTH I S , NOT 5,DO-5UO, 511~ elEVATION IS (RETURN TO MAIN PROGRAK HYORAUlI C JUMP OCCURS DOWN- NOT NEW BACKlIATER STREAM REQU I REO 5226 5290 t t SOLVE FOR UPSTREAM DEPTH lRETURN TO HAIN PROGRAM I SOLVE I\lt DOWNSTREAK (ABOVE CRITICAlI BASED ON DEPTH (Kt.OW CRITICAl) CRITICAL MOMENTUH AT BRIDGE BASED 011 CRITICAl Ho-- 5'00-51110, 5_20 HENTUM AT BRIDGE f:lllO-5_10. 5lI~ .., .... g :0= '" ..,. *Numbers refer to statement numbers in source deck of computer program. FIGURE 4 .