Optimum combination of water drainage, water supply and eco-environment protection in coal-accumulated basin of North China

The conflict among water drainage, water supply and eco-environment protect ion is getting more and more serious due to the irrational drainage and exp loitation of ground water resources in coal-accumulated basins of North Chi na. Efficient solutions to the conflict are to maintain long-term dynamic b alance between input and output of the ground water basins, and to try to i mprove resourcification of the mine water. All solutions must guarantee the eco-environment quality. This paper presents a new idea of optimum combina tion of water drainage, water supply and eco-environment protection so as t o solve the problem of unstable mine water supply, which is caused by the c hangeable water drainage for the whole combination system. Both the managem ent of hydraulic techniques and constraints in economy, society, ecology, e nvironment, industrial structural adjustments and sustainable developments have been taken into account. Since the traditional and separate management of different departments of water drainage, water supply and eco-environme nt protection is broken up, these departments work together to avoid repeat ed geological survey and specific evaluation calculations so that large amo unt of national investment can be saved and precise calculation for the who le system can be obtained. In the light of the conflict of water drainage, water supply and eco-environment protection in a typical sector in Jiaozuo coal mine, a case study puts forward an optimum combination scheme, in whic h a maximum economic benefit objective is constrained by multiple factors. The scheme provides a very important scientific base for finding a sustaina ble development strategy.