The buried depth of the bottom plate is 207.95-310.75 m, the thickness of the aquifer (group) is 23.50-158.40 m, the average thickness is 104.56m, and the sand layer accounts for 74% of the group thickness, mainly light grayish green medium sand, followed by fine sand and coarse sand, partially sandwiched by several layers of hard "sandstone plates" formed of calcareous cement, with 0-17 layers of clay and sandy clay, and the thickness is 0-61.06 m. According to the data of water (III) 3-hole mixed pumping test: the water level elevation is +20.51m,