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<br />START <br /> <br /> <br />TEMPORARILY ASSUME WATER DEPTH <br />15 SAME AS PREVIWS OEPlH <br /> <br />CALUlLAn: WATER SlJRfACE ELEVATION <br />OIl OTHER SIll!: OF BRIUGE ASSUMING <br />LOW FLOW COIlTIIlL "BLF TINE" <br /> <br />CALCULATE ENERGY ELEVATION <br />FOR LQ,/ flOW DEPTH <br />"MAIN PROGRAMw <br /> <br />NO <br /> <br />5 THE ASSUMED LOW fLOll <br />WATER SURFACE ELEVATION <br />ABOVE THE HINIMLM TOP OF YES <br />ROAiIWAY (IS THERE WEIR 1 <br />flOW? 6030 <br /> <br /> <br />Y ELEV,. SU D <br />WATER ELEVATlDIl PLUS PREVIOUS <br />SECTION V~ITY HEAD (OUTSIDE <br />8RIDGE . 6032 <br /> <br />YE <br /> <br />IS U.S, ENE ROY ELEV. R <br />LOW flOW ABOVE HIGKEST U.S. <br />LOW CHORIJ ELf.VATlUIl? <br />"8 <br /> <br /> <br />IS fNERGY ELEVATlOll <br />FOR I.0Il flllll ABOVE <br />MINIIIJM TOP ROAD? <br />"BWEI R 6040" <br /> <br />DOES BRIDGE <br />HAVE PIERS <br />6230 <br /> <br /> <br />fLOW IS BY COMBINATION <br />OF LOll FLOW AND WEIR <br />FLOlI. .8WElR 6230" <br /> <br />CALCULATE EIIERGY ELEV <br />FOR PRESSUR< FEUW. <br /> <br />RETURH TO MAIN PIIlGAAM NeD COMPUTE <br />LOSSES UUE TO SKIN FRICTION8Y <br />AT. .8WElR 6060" <br /> <br />15 HIN1""" TOP OF IOAIIlIAY <br />ELEVATION ABOVE THE <br />HIGlfEST U.S. LOW CHOIlO <br />AT ON? 6820.1 <br />o Y <br />IS EO FOR LOW AHU <br />WEIR FLOW LESS THAH <br />ElLC? 0821.1 <br />o <br />COII'IJTE E6 FOR <br />PRESSURE NeO WEIR <br />FLOll. 6240 <br /> <br />YES <br /> <br />NO <br /> <br /> <br />IS MI,.nIlH TOP OF RIlAIlWAY <br />LUVATlOIl AllOVE THE <br />HI~LST 0.5. LOW CHORU <br />EU::VATlOil? 017U <br /> <br />NO <br /> <br />YES <br /> <br />IS THE <NERGY EUVATlON <br />FOR LOW FLOW AllOVE <br />MilXIHUH UIERGY FOR LOW <br />FLOW (CRITICAL DEPTH ? <br /> <br />COMPARE EG fOR PRESSURE <br />AHD WEI R AHO LOll AHD <br />lIE1R FLQ,/. HIGlfER EG <br />lIllLS. 6822 <br /> <br /> <br />YES <br /> <br />15 THE EH<RGY <LEVAlION FOR PRESSURE <br />FLOW AllOVE LOW FLOW ENERGY ELEVATION? <br />" WEIR 0160" <br /> <br />VEl <br />IS PROFILE BEING <br />COMPuTEU FOR SUij- <br />CRI TICAL FLOW? <br />"BWEIR 61BU" <br />NO <br />ERROR MlSSAUE <br />SUPE RCRI TI CAl. <br />FLOW-PRESSURE <br />FLU. <br />"8WElR 0180" <br /> <br />YES <br /> <br />IS ENERGY ELEVATION FOR <br />PRESSURE FLOW AllOVE MIN. <br />T AT? "BWElR 6190" <br /> <br />YES <br /> <br />PRESSURE <br />flOW CONTROLS <br /> <br />COItIINATlON OF PRESSlJRE <br />A1W WEIR FLOW CONTROLS <br /> <br />ENERGY ELEVATION IS <br />DETERMINED IN SU8ROUTINE <br />BWEIR. DEPTH MUST 8E <br />DETERMINED FOR KNOIIN <br />ENERGY ELEVATION BY TRIAL <br />AHO ERROR IN MAIN PROGRAM, <br />.8WElR 6020. <br /> <br />Figure 3. Special Bridge Routine General Logic Diagram (Reference g) <br /> <br />11 <br />