“十一”五期间,国家加大对大型灌区续建配套节水改造的投资力度,通过连续五年的投资,灌区粮食产量增加,灌溉水利用系数明显提高,既节约了水资源,又降低了农民灌溉成本,取得了明显效益。大型灌区节水改造工程设计中通过方案比较,选定最优设计方案,可起到降低工程成本,减少工程投资,提高投资效益的作用。 During the “Eleventh Five-Year Plan” period, the state stepped up its investment in continuing to implement water-saving projects in large-scale irrigation districts. Through five consecutive years of investment, the grain output in irrigation areas has increased and the coefficient of utilization of irrigation water has been significantly raised, which not only saves water resources, But also reduce the farmers’ irrigation costs and achieved obvious benefits. In the design of water-saving renovation project of large-scale irrigation area, the optimal design scheme can be selected through comparison of schemes and can play the role of reducing project cost, reducing project investment and improving investment efficiency.