Determination of hydraulic conductivity for granular filters based on constriction size and shape parameters

This experimental study is an attempt to apply the constriction size concept for determination of hydraulic conductivity of filter material. Five shapes of granular filter material having varying gradations were used for the experimental investigations. The controlling constriction size of selected shapes having varying gradations were worked out and related to the experimental results of hydraulic conductivity. The empirical model for hydraulic conductivity determination based on controlling constriction size for each selected shape of granular filter material was developed. Finally, a combined empirical model for the determination of hydraulic conductivity of granular filters was developed based on shape parameters and the controlling constriction size.