Unit designed for the study and laboratory investigation of field drain filter materials.The unit consist of a transparent column which may be filled with any soil type, supported on a stand.A removable base section is provided into which the filter material to be studied in placed.
Water is supplied to the column under a constant head and permeating water and soil is collected at the base.The discharge from the drain can be observed to calculate the efficiency of the filter material.
1.- Investigation of drain filter materials.
2.- To select optimum filter/ soil combinations.
3.-To determine relative efficiencies of drain filter materials