Analysis and Evaluation of Karstic Groundwater Resources Quantity in Luocheng County of Guangxi

Based on the geological condition,development characteristics of karst,types of water- bearing medium,occurrence and hydrodynamic condition,the karst groundwater system of Luocheng County of Guangxi province was subdivided.Combined with the property of aquifers,the infiltration coefficient of precipitation,volumetric method and the dry season runoff module were used to predict the natural recharge,reserve and allowable exploitation quantity of karst groundwater of Luocheng County,respectively. Results show that the mean annual natural recharge of groundwater over the study area is 34 189. 75 ×104m3/ a,among them the mean annual natural recharge of karst groundwater is 34 083. 32 × 104m3/ a. The reserve of karst groundwater is 116 584. 25 × 104m3/ a and the mean annual allowable exploitation quantity over study area is 7 125. 67 × 104m3/ a. Results present here provide a scientific basis for the development and utilization of karst groundwater in Luocheng County.