TN-25 : Guidelines for sample survey for minor irrigation works

Abstract

Water balance study means the book keeping of water of a region/basin in relation to the components of entire hydrologic cycle or part of it, done over a specified period. It is an effective tool for estimating the available water potential both surface and sub-surface and is also useful for assessing the existing utilization pattern for optimal planning and efficient management of water resources. In water balance study, draft from ground water is a major component which needs to be evaluated. In most of the cases figures relating to each of the minor irrigation works i.e. area irrigated by each well, unit draft of well, pumping hours etc. are not collected in systematic and rational manner and thus the statistics relating to minor irrigation works suffers from inadequacy of details. Hence for the above reason, the sample survey for minor irrigation works is to be conducted.

This report deals with the guidelines for such sample survey on the basis of complete inventory of wells operating in the area both for irrigation and water supply, their classification, area irrigated, mode of water supply etc. From the data, thus, collected, the methods for calculating draft from ground water for minor irrigation works are also indicated.