The canal irrigation system in the Indus Basin is facing a number
of operational problems resulting in very high degree of losses of
water during conveyance as well as during the application of
irrigation to crops. These water losses on one hand result in
constrained water supplies of canal water but on the other hand
provide a source of recharge to the Indus Basin aquifer. Because of
increasing scarcity of surface water resources, minimization of
recharge through lining is one of the alternatives. Consequently,
lining of different components would influence the recharge
potential differently. In order to respond to the question of
recharge contribution from irrigation conveyance system components,
this study was carried out to measure and assess the recharge
contribution from canals and distributaries through field
investigations and computer simulation techniques, to evaluate the
recharge contribution from watercourses and fields (tertiary
irrigation system) using field investigation techniques and to
compare the contribution of watercourse system to the recharge
potential under lined and unlined options.
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