As the seepage rate of 3.1 mm/d was considered too high, sodium tripolyphosphate (STPP) was dissolved in the dam water in an attempt to disperse the clay and reduce the hydraulic conductivity. Application of STPP altered the original sealing layer at first and, as seepage progressed, a new seal started to form at a depth of 0.8 m below the batter. The seepage rate was reduced to 0.39 mm/d and the hydraulic conductivity of this new seal was 2.0 x 10-9 m/s.
Number of Pages
Dams, Sodium tripolyphosphate, Sealing
Pepper, R G. (1983), Chemical sealing of small earth dams using sodium tripolyphosphate. Department of Agriculture and Food, Western Australia, Perth. Technical Bulletin 67.
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