1 - Alaska Energy Data Inventory

Maximum water hammer pressure gradient elevation at turbine = 1302 ft(WHAMO)Minimum water hammer pressure gradient elevation at turbine = 508 ft(Allievi Charts)The minimum water hammer pressure gradient elevation at the turbine wastaken at 508 ft for conservatism.The maximum pressure gradient at any point along the penstock isdetermined by drawing a straight 1 ine between the maximum surge and themaximum water hammer pressure gradient elevation at the turbine, andsimilarly for minimum pressures. The accuracy of this method was verifieaby placing dummy nodes at various points along the penstock for the WHAMOcomputer runs. The pressure graaient in the power tunnel was 1 ikewisedetermined by drawing aline between the minimum pool and minimum surge(f~:>r minimum pressure gradient) or between maximum pool and maximum surge(for maximum pressure gradient).83-17