Ground water is a vital water resource in the Choushui River area of Taiwan. A significantly increased demand for water, resulting from rapid economic development, has led to large scale ground water extraction. Overdraft of ground water has considerably lowered the ground water level, and caused seawater intrusion, land subsidence, and other environmental damage. Sound ground water management thus is essential. Chinese government officials have set up a(n) system that allows it to make water management decisions using interactive computer models based on real-world processes.