1. A method of predicting an active sonar array's performance, comprising the steps of: specifying an acoustic transmitter and an acoustic receiver of said active sonar array; selecting a geographical location; obtaining a bathymetry, a bottom composition and a sound speed profile database for said selected geographical location; calculating a bottom-loss-and-scattering corrected-for-slope for said geographical location using said bottom composition and said bathometry; and calculating a deterministic component of surface reverberation using said bathometry, said bottom-loss-and-scattering corrected-for-slope and said sound speed profile database.