Underground water in lower and middle reach of Futuanhe river is major water source for industrial and agricultural production and living in Rizhao city. Due to long time over-exploitation, some environmental problems, such as funnels, sea intrusion and soil salification have happened. In order to solute the problem of lack of water and promote ecological environment quality, study on necessity and feasibility for building underground reservoir in Futuanhe river is carried out. It is regarded that there is ...