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Abstract
Investigation to estimate flood levels in the Munmorah lakes using rainfall runoff data for seven or eight years. Unitgraphs derived for Wyong and Ourimbah Creeks and calculated for Wallarah Creek and the rest of the catchment. Inflow hydrographs were computed and routed through the storage system of the three lakes, taking into account the discharge characteristics of Budgewoi channel, characteristics of constrictions at Toukley bridge and inflow characteristics of The Entrance channel. Resulting lake levels for floods of various recurrenrt frequencies can be used to estimate the design basement level for power stations for this area.