1. The data on the hydraulic resistance of beds of granular materials are systematized by starting from the Darcy-Weisbach equation and a two-term expression for the dependence of the resistance coefficient on the Reynolds number. 2. It is shown that all published data regarding the dependence of the resistance coefficient on the Reynolds number are described by the standard equation proposed in [9], provided that shape and surface reduction coefficients are used. 3. An equation has been derived for determining the pressure drop across a bed of spherical aluminum silicate catalyst particles.