IL3IL HIGHPOINT21PRESSURE CUT- OUT LEVELMEAN WATER LEVEL (MWL)CUT- IN LEVELWET-WELLDISCHARGECASE 2 - PRESSURE MAIN WITH A HIGH POINTIL hpnILDISCHARGEdINLETPUMPING UNITCUT - IN - LEVELMEAN WATER LEVEL (MWL)CUT-OUT LEVELCASE 1 - ALWAYS RISING PRESSURE MAINVALVE CHAMBERWET-WELLIL hp22IL hp1d1HGLINLETCASE 3 - UNDULATING PRESSURE MAINCUT-OUT LEVELMEAN WATER LEVEL (MWL)CUT - IN - LEVELWET-WELLINLETHL1L2SCOURHLdAIR VALVELnAIR VALVESTATIC HEAD :Hs = IL DISCHARGE - MWL + dHsLRECEIVING SEWERSCOURHn HdAIR VALVERECEIVING SEWERAIR VALVEHHL1HL2L3RECEIVING SEWERPUMPING UNITVALVE CHAMBERb)IF H < HEADLOSS IN L3STATIC HEAD :a)IF H - > HEADLOSS IN L3Hs = IL HIGH POINT - MWL + dHs= IL DISCHARGE - MWL + dNOTE: IN TOTAL MEAN HEAD CALCULATIONS THE FRICTION HEAD LOSS IN CASE a) SHOULD BE CALCULATED TO THE HIGH POINT (L1), AND IN CASE b) TO DISCHARGE (L2)33dMAINPUMPING UNITPRESSURE VALVE CHAMBERMAINPRESSURE MAINIL DISCHARGEPOWER AND CONTROL CUBICLE 22THE HIGHEST VALVE REPRESENTS THE HIGHEST GRADIENT POINT IN THE PRESSURE MAIN.CALCULATE STATIC HEAD as : Hs = IL HIGHEST GRADIENT POINT- MWL + dNOTE: IN TOTAL MEAN HEAD CALCULATIONS THE FRICTION HEAD LOSS SHOULD ALSO BE CALCULATED TO THE HIGHEST HYDRAULIC GRADIENT POINT.CALCULATE FRICTION HEAD LOSS TO EACH HIGH POINT PAST AND INCLUDING THE HIGHEST POINT AND TO DISCHARGE AND ADD RESPECTIVE STATIC HEADS, eg. FOR hp1: Hs + H = ( ILhp1 - MWL - d ) + fb)c)a)VdL12gPOWER AND CONTROL CUBICLEPOWER AND CONTROL CUBICLEBASED ON SYDNEY WATER STANDARD DRAWINGSTATIC HEAD: