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~ ~ 2-77 SUBPROGRAM BLFLO, LOW FLOW CONTROL I CALCULATE CRITICAL DEPnI OUTS IDE BRIDGE CONSTRICTION I l 122S:lt I CALCULATE CRITICAL DEPTH WITHIN RRIDG~ CONSTRICTION I l 1260 I CALCULATE K1MENTUM WlnUN BRIDGE FOR CRITICAL DEP11l I l 121;0 YES NO Its SUBCRITICAL now A.SSUKED 1.NSTEAD OF SUP'lRCRlilCAL 'FLOW'! I 1270 I IS K)HENTUM IN CONSTRICTION BASED ON DOWNSTREAM DEPTH I 1 IS MOMENTUM IN CONSTRICTION BASED ON UPSTREAM DEPTH I, GREATER THAN CRITICAL MOMENTUM WITHIN BRIDGE? GREATER THAN CRITICAL MOMENTUM AT BRIDGE? 1275 1300 YES NO YES NO WkTER OEPTK IN BRIDGE . SOLVE FOR DEPTH (CLASS C) WATER DEPTIl IN BRIDGE .. CALCULATE UPSTREAM WATER IN BRIDGE WHICH HAS !-l)MEN- SURFACE EL. BY YARNELL CRITICAL: CLASS B FLOW TUH EQUAL TO MOMENTUM WITH- CRITICAL; CLASS 8 FLOW ENERGY EQ. FOR ~ 1285 IN CONSTRICTION BASED ON 1315 FLOW UPSTREAM DEPTH 1280 1330-1380, 1310 SOLVE FOR NEW OOWN~ SOLVE FOR NEW UPSTREAM STREAM DEPTH (LESS THAN DEPTH (ABOVE CRITICAL) SOLVE FOR DEPTH IN BRIDGE CRITICAL) BASED ON SOLVE FOR DOWNSTREAM DEPTH BASED ON CRITICAL WHICH HAS :1OIiENTUM EQUAL CRITICAL MOMENTUM AT (LESS THAN CRITICAL) WHICH KJMENTUM AT BRIDGE TO. KlMENTUM. lolITIUN BRIDGE HAS HOIiENTUM WITHIN CONSTRICTION BASED ON 1330-1380. 1290 CClNS'IRlCnON SASED Oli 13]0-1380. 1320 DOWNSTREAM DEPTH UPSTREAM DEPTH 13]0~ 1380. 1415 1]]0-1380, 1390 PRINT NOTt: DOWNSTREAM PRINT NOTE: UPSTREAM DEPTH IS . NOT ELEVATION IS RETURN TO MAIN PROGRAM HYDRAULIC JUMP OCCURS RETURN TO MAIN PROGRAM NOT NEW BACKWATER DOWNSTREAM REQUIRED 1290 1325 SOLVE FOR UPSTREAM SOLVE FOR DOWNSTREAM DEPTH (ABOVE CRITICAL) DEPTH (flELOW CRITICAL) BASED ON CRITICAL BASED ON CRITICAL KJMENTUM AT BRIDGE KJKENT\JM AT BRIOG!: 1330-1380. 1385 1)30-1380, 1]90 "'Numbers N!fer to statement numbers in source deck of computer orogram Fi gure 4