Brink depth technique to measure free overfall in field channels Goswami Manasmani Dev*, Engineer, Das M.M.**, Ex-Director * Deptt. of Agriculture, Assam, Guwahati-781 022, India. ** Technical Education, Assam, Presently Prof. Emeritus, Assam Engineering College, Guwahati-7810 13, India. Abstract The easy and accurate measurement of irrigation water through field distributaries permits its economic use. Less number of measurement of low parameters in channels will minimize the error in discharge calculation. A laboratory procedure is carried out to develop the measurement technique of flow in irrigation channels. The relationship amongst the brink depth, ye, the critical depth, Ye and unit discharge, q, is developed as q-cyek, where c, k are constants. In present investigation, the relations are ye=1.37 Ye and q-5.08 ye32. The results are tested in field distributaries. The technique suits best in different field conditions. There is little impact of infiltration characteristics on discharge evaluation. Top |