A new water resources appraisal system in water-saving irrigation

Water-saving irrigation is a long-term strategy and a focus of water resource management in areas with shortage of water. Great potential exists in Water-saving irrigation because rural water takes more than 70% of available water resources. However, existing indicatives of water-saving efficiency only comprises water-saving amount or water-saving efficiency in irrigation without considering water amount in repetitives; this incurs error in calculating water-saving amount. In this paper, firstly, the concept of water-saving irrigation was identified in the perspective of water resources, then new indicative system was established to evaluate water-saving irrigation, i.e. Coefficient of irrigation water resources was used including once water use percentage and repetitive percentage, multiple water use coefficient in channel and multiple water use coefficient in the field, on which was based to deduce water resources coefficient transporting in channel, coefficient of irrigation water resources in wells and channels, coefficient of irrigation water resources in base land. These help calculation of actual water-saving amount and better understanding the actual potentialities of water-saving in local area.