Study on Water Loss and Utilization Efficiency of Canal in Nanxiong Waterfall Irrigation
The aim of this study is to analyze the correlation between water use efficiency,water loss,and channel density in the secondary channels of the Pubu irrigation area in Nanxiong City.Based on the distribution of irrigation channels,five branches of the east canal were purposively sampled in the region.The inflow and outflow of water in selected segments of the channels were measured.After considering water usage,evaporation,and seepage,the loss and utilization efficiency of channel water were determined.The results showed that the range of water loss in the branch channels in the region was 1.2×10-4～4.7×10-4 m3/s,with a water utilization efficiency of approximately 40%～90%,and a channel density of 0.03～0.25 km/km2.The study shows a negative exponential relationship between water utilization efficiency,water loss,and channel density in the region.In addition,water loss was positively correlated with the width of the channel.Some channels in the area need to be repaired to reduce water loss.
irrigation channelchannel densitywater losswater use efficiency
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