Abstract
Considering different fixed and operating-cost components of water production, a mathematical model has been developed for optimum spacing of shallow tube wells in relation to channel lining and conveyance losses. The model is solved for light-textured soil and shallow aquifer condition of North Bihar, India using the existing market rates of materials. However, the mathematical concept is universally applicable. Optimum spacing of 300 m is found when 70% of the channel is lined. The cost of water production for the study worked out to a minimum of Rs.41.08 (one U.S. dollar equals approximately 18.50 Indian rupees [Rs.]) per 100 m3 of volume. For unlined channel, an optimum spacing of 140 m is found for which the cost of water production comes to Rs.41.93 per 100 m3 of volume.
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