lowland area has faced many water problems such as flood, drainage, water pollution, saltwater intrusion, etc. Generally, an integrated water management system is needed to solve these problems in the lowland area, both in terms of water quantity and quality. The main objective of this study is to develop the integrated water management system for Saga lowland. A comparative study between the water management systems in the Netherlands and Saga lowland is carried out. The Policy Analysis of Water Management for the Netherlands (PAWNp roject) is reviewed to clear the concept of integrated water management in lowland. The water system in Saga area is evaluated from the view point of flood control and drainage by using a computer model. Main conclusions of this study are as follow;
1) New concept for water management/control system should be developed in Japan.
2) Drainage system planning in Saga lowland has been limited by flood control system of the main river, in terms of design period and capacity.
3) Open channel network with some facilities such as storage ponds, pumping stations, etc. are an efficient water system in lowland.
4) Policy analysis of water management especially for lowland should be conducted to develop the integrated water management.
