U. P. Institute of Agricultural Sciences, Kanpur, U. P.
*Present address: Deputy Commissioner (W.M.S.) Bharat Sarkar, Krishi Mantralaya, New Delhi.
**Present address: Assistant Professor, Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, Distt. Nainital (U.P.)
***Present address: Deputy Director, Soil Conservation, Almora (U.P.)
In a study of 101 test cases of the breaches of bunds in the soil conservation projects of Kanpur district, investigating the causes of constructional failures, it was observed that inadequate ramming of the soil was a common feature of all the breached spots. The frequency of breaches in sandy soils increased quickly when the compaction given to the soil was below 12% of the maximum attainable bulk density. In loamy sand the incidence increased below 20% and in sandy loam soils below 23% of maximum compaction. Lower limit of compaction to be given in the construction of bund on sandy, loamy sand and sandy loam soils to aviod constructional failure was found to be 1.48, 1.51 and 1.57 g/cc respectively.
Breaches, compaction
