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As per I.S code 3370 part I & II, there is 40mm tolerance for leakage for R.C.C structures. following method are used for measuring the leakage.
1) if the tank capacity more 6ml, tank should be fill by 1/3 for reading step by step and tress the leakages.
2) After tress, mark the spot and use appropriate method for attend the same. such as epoxy grouting, epoxy material and any other method which is suitable as per site condition.
3) take reading with pizometer and subtract the reading which is received from evaporation pan. take final reading. reading is taken after 24 Hr up to seven day.
Adopt this procedure for hydro testing of R.C.C structure. if leakage found more than 40mm. whole procedure should be repeat again.
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