Performance Assessment Of Water Distribution Systems For Nyarubogo Irrigation Scheme, Rwanda
Abstract
This study aimed to examine hydraulic performance and productivity of Nyarubogo irrigation scheme, with a particular emphasis on water delivery performance ratio (WDPR), adequacy, efficiency, dependability, equity, and productivity.The results show that the head, middle, and tail sections had average WDPR of 0.98, 0.60, and 0.52, respectively. The tail and head sections had values of delivery performance ratio (DPR) that indicated a slight under-discharge (0.55) and slight over-discharge (1.04). The temporal average adequacy from head (0.995) to tail (0.742), values showed a decrease across the irrigation scheme while spatial adequacy fluctuations ranged from 0.882 to 0.909. The dependability was classified as good (0.011) at the head and at the middle (0.096), and fair (0.14) at the tail sections of the irrigation scheme. The study further found an average equity ratio of head to tail (ERHT) of 2.06 indicating downstream disparities in the distribution of water equity. The equity was classified as good at the head and middle, and fair equity at the tail. Efficiency was good at the middle (0.983) and tail (0.969), and poor at the head (0.671). The land productivity of 4.04±0.13 tons/ha were produced on average at upstream, 3.92±0.17 tons/ha at midstream, and 3.5±0.14 tons/ha at downstream. At the head, the water productivity (WP) was 0.39 kg/m³ which was low as compared to midstream (0.62 kg/m³), and downstream (0.63 kg/m³). The economic water productivity (EWP) values were $0.17/m³, $0.27/m³, and $0.28/m³ for the head, middle, and tail end of the irrigation scheme, respectively. These findings highlighted the necessity of implementing focused interventions in water management and infrastructure, particularly in the middle and tail sections, so as to guarantee fair distribution of water and improve overall scheme productivity.
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DOI: http://dx.doi.org/10.52155/ijpsat.v47.1.6561
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