The paper analyses results of the inventory of irrigational water derivation in the former USSR. The ways of deriving return and collector-drainage waters, as well as the load exercised by these waters on water bodies, are investigated. The paper discusses the main areas of collector-drainage water re-use and utilization, the latter being regarded as a means of preventing surface water pollution and salinization in the zones of irrigation. Necessity in working out a concept of effective, ecologically substantiated use of collector-drainage waters is substantiated.

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