Optimal scheduling plan of rotational canal: a case study of Nandpur minor of Udham Singh Nagar district
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Date
2018-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Canal scheduling is the most important activity among the management practices and has a high impact on the performance of irrigation canal system in terms of equity, dependability, uniformity and efficiency. With increasing demand of water resources, it has become necessary to develop planning model for the irrigation and optimize scheduling of irrigation so that with limited water resources, maximum water requirements could be fulfilled efficiently. Keeping these factors in view the present study was undertaken for Nandpur minor canal located in Gadarpur Development Block of District Udham Singh Nagar, Uttarakhand to work out the optimal canal operation schedules for maximum benefits from the culturable command area of the minor canal. The 47 years (1971-2017) rainfall data were analyzed for determining the rainfall pattern of the study area. By arranging the daily rainfall data to weekly, monthly and yearly basis the probability of wet, normal and dry rainfall spells was estimated. The analysis revealed that the week 23 to 39 received normal to above normal (wet) rainfall whereas the remaining weeks experienced below normal (dry) rainfall. The annual rainfall analysis showed that the probability of getting normal rainfall in the study area was 55.31%. In the decadal rainfall analysis, the continuous decrease and increase of monthly rainfall during the month of July and September, respectively, indicated a late onset and withdrawal of monsoon in the region during 1975-2004. The linear programming optimization model was developed and employed for the allocation of the land and water resources optimally. The gross irrigation water requirement for cultivated crops was estimated using CROPWAT ver.8.0 software. Three rotations of canal operation, namely 14 days (7 days “OFF” and 7 days “ON”), 21 days (7 days “OFF” and 14 days “ON” or 14 days “OFF” and 7 days “ON”) and 28 days schedule (7 days “OFF” and 14 days “ON” or 14 days “OFF” and 14 days “ON” or 7 days “OFF” and 21 days “ON) for full and 75% of design discharge capacity of minor canal under normal and dry rainfall conditions were tested to arrive at the optimal scheduling of the canal. The global optimal schedule for Nandpur minor was obtained as 28 days (21 days “ON”) at full canal capacity and normal rainfall conditions having net return from the command as Rs. 47.78 Million and having entire area of 577 ha under cropping activities (59.07%, 10.94% and 29.98% area under Wheat, Pea and Sugarcane, respectively). The 21 days (14 days “ON”) operation schedule at full canal apacity and normal rainfall conditions having net return of Rs. 46.67 Million with 64.95%, 5.06% and 29.98% area under Wheat, Pea and Sugarcane, respectively and no land left for allocation appeared at second rank.
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