Optimal design of terminal channel network in irrigation command area
1990
Pandit, Dhananjay
At present most of the Asian countries are facing the problem of very low efficiencies in the irrigation projects. One of the reasons for this is the negligence of the channel layout in the command area. The lack of suitable technical criteria for finding out the optimal layout of terminal channels leads to the poor efficiencies of the most of the Irrigation projects. The present study is an attempt to give the channel network which will be economical as well as it will give the small losses by using network models. In this study, in order to determine the possible optimal layout, network models viz. Minimal Spanning Tree (MST) Model and Shortest Path (SP) Model, which would find the layout considering the lengths and the Out-of-Kilter (OK) Model, which considers the lengths as well capacities of the channels, were examined. The existing MST algorithm was modified to incorporate the positive gradient condition in case of open channel network. The results of the models were checked considering cost and seepage, not only in continuous water supply but also in rotational irrigation. All the three models were applied to three different fields in the Pilot project 1 of the Mae Klong Irrigation Project, Kanchanaburi, Thailand. The use of network models will be very useful in laying out the channels in the command area. Through the cost and seepage analysis of the layout obtained from network models, the MST was found as the best choice among the network models. For rotational irrigation, dividing the field in several number of blocks and then applying the network models yielded satisfactory results.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
