The Change of the Water Demand and Delivery Water Requirement for a Large-sized Paddy Irrigation under Urbanization

Abstract

  This study is to examine the effect of a paddy field decrease on the diversion requirement for paddy area by modeling its water demand structure using the CB method in a paddy field area where urbanization has progressed in recent years. As a result, it was shown that where in case of the irrigation system with a dual-use canal, it is necessary to add the decrease of return flow from the paddy field due to the paddy area decrease to the diversion requirement as delivery water requirement.