Ground water
The groundwater reserves in this area are about 54.6253 million cubic meters. The reserves in Chuandao District are 45,104,600 cubic meters, that in Poyuan District is 9,520,700 cubic meters, and the annual exploitable volume is 32,510,700 cubic meters. Taking 1982 as an example, the actual mining volume was 35.4362 million cubic meters, and the overexploitation was 2.9255 million cubic meters. The annual exploitable volume in Chuandao District is 29,831,500 cubic meters, and the actual mining volume has reached 34,963,600 cubic meters (including 29,419,900 cubic meters of urban industrial and domestic water), with an overexploitation of 5,132,100 cubic meters. Due to over-exploitation in the old urban area, Shangmaying subdistrict, Shilipu subdistrict and other areas, the groundwater level has dropped year after year, which has formed a funnel.[2]