Water characteristics of Jianghuai watershed

Generally speaking, the water resources in the Jianghuai basin are scarce, and the surface water mainly comes from atmospheric precipitation. The annual precipitation in most areas of this area is 850 ~1000 mm, among which the central and western Dingyuan, southwest Fengyang, east Changfeng and northeast Fei are the areas with the least rainfall, and the annual precipitation is less than 900IYIITI. The precipitation outside the area is insufficient, the soil moisture accumulation is small, and the groundwater resources are poor, so it is difficult to use. The average annual groundwater resources in the east are less than 50000 In/km, and those in the west are less than 10000 In/kni. The buried depth of groundwater is generally 2 ~ 8m, the water inflow of single well is generally less than 10m m/d, and the water inflow of single well in Mingguang area is less than 1060.