MODELLING DEMAND AND DISTRIBUTION IN THE HUINONGSYSTEM, NINGXIA, YELLOW RIVER BASIN

摘要

Demand simulation is relevant to identify main problems of current excess water use, and to evaluate alternative improvements both at the farm and the distribution scales. Demand simulation is performed first at the unit/distributor level, and is thenaggregated to the branch and the sector. At the unit level, the demand is estimated from the irrigation schedules at farm and the performance of the water application at field. Aggregation to the branch canal system and to the Sector is performed usingsimplified management delivery rules and following the process of water allocation currently applied. These procedures are described as well as those for generation of required data. Results for an application to the Sector 4 of the Huinong irrigation system, in the Pingluo area, Ningxia, are presented and discussed, including the comparison of the simulated demand with average allocations.