Abstract
A global river discharge simulation is conducted taking into account irrigation water intake and reservoir operation. The monthly irrigation water demand is calculated globally by a modeling approach, and it is withdrawn from the river section in the same calculating cell. Four simulation runs (with/without irrigation intake × with/without reservoir operation) are compared, to clarify the effect of irrigation water intake on the river discharge simulation.
In the latter part, irrigation water demand and supply is assessed in monthly interval for nine basins in the world. The result suggests that the irrigation water intake significantly decreases the river discharge in specific period and affects the water resources in the whole river basin.
