Data obtained by Medwin and D’Spain [J. Acoust. Soc. Am.79, 657 (1986)] for low‐frequency propagation over gravel‐covered rigid planes are inverted by applying the procedure [J. Acoust. Soc. Am. Suppl. 179, S68 (1986)] developed for regularly shaped protuberances. The development is based on analytical results for a point source irradiating an embossed plane, and on the uniform asymptotic form of the coherent field as a Sommerfeld type wave system in terms of the complex error function complement (Q). Initial estimates of unknown parameters are obtained by working with elementary approximations of theQintegral, and then used in the complete integral for refinements and final computations. The procedure delineates the roles of interference and damping on the elementary wave components of theQsystem, and the resulting graphs display the primary data trends.