Abstract:The main water storage space of Dagujiahe river groundwater source region in Yantai city is Quaternary alluvial-alluvial sand and sand-gravel layer porosity. Nanshangfang water source region, Ximou water plant and Taokou water plant in Yantai city, Zhiyang water plant in Fushan district and Dongmoutang water plant in Yantai city are important groundwater source regions. The water source areas have been monitored for nearly 30 years, and a large amount of data on the dynamic change of water level, water quality and water quantity have been accumulated. On the basis of collecting and analyzing the data of topography, geomorphology, hydrogeology and environmental geology, hydrogeological characteristics and dynamic changes of groundwater in the groundwater source region of Dagujia river in Yantai city have been summarized, and the safe yield of groundwater under the constraint of geological environment has been evaluated. Multiple small to medium-sized centralized water supply water source are mainly formed in the discharge area of groundwater water or downstream area in Dagujia river. Water level change is mainly affected by precipitation and artificial exploitation. Water quality in source areas tends to deteriorate. After the evaluation, it is determined that permissible mining capacity of Dongmotang water plant is 25300m3/d，permissible mining capacity of Nanshangfang-Ximu water plant is 17700m3/d, permissible mining capacity of Hechengge water plant is 53300m3/d，and permissible mining capacity of Zhiyang water plant is 23000m3/d.
