Tonkul S.Baba A.Şimşek C.Durukan S.Demirkesen A.C.Tayfur G.2024-07-222024-07-22201901676369http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14303Gediz Basin, located in the western part of Turkey constituting 2% land of the country, has an important groundwater potential in the area. Alasehir sub-basin, located in the southeast of the Gediz Basin and subject to the extensive withdrawal for the irrigation, constitutes the study area. Natural recharge to the sub-basin due to precipitation is numerically investigated in this study. For this purpose, 25 research wells, whose depths range from 20 to 50 m, were drilled to observe the recharge and collect the necessary field data for the numerical model. Meteorological data were collected from 3 weather stations installed in the study area. The numerical model HYDRUS was calibrated using the field water content data. Soil characterization was done on the core samples; the aquifer characterization was performed, and the alluvial aquifer recharge due to precipitation was calculated. As a result, the computed recharge value ranges from 21.78 to 68.52 mm, with an average value of 43.09 mm. According to the numerical model, this amount of recharge corresponds to 10% of the amount of annual rainfall. © 2019, Springer Nature Switzerland AG.EnglishAll Open Access; Green Open AccessConservation of Water ResourcesEnvironmental MonitoringGroundwaterModels, TheoreticalRainSoilTurkeyGediz BasinTurkeyAquifersGroundwater resourcesMeteorologyNumerical modelsPrecipitation (chemical)ground waterrainsoil waterground waterAquifer characterizationAquifer rechargeGediz BasinGround water rechargeGroundwater potentialsModel calibration and validationSoil characterizationSubbasinsaquifercalibrationhydrological modelingnumerical modelprecipitation (climatology)rechargeair temperatureaquiferArticlecalculationcalibrationenvironmental temperatureevapotranspirationhigh temperaturehumidityHYDRUS 1D simulationlow temperaturemathematical analysismathematical modelmeteorologyprecipitationrunoffsimulationsoil analysisTurkey (republic)validitywater contentenvironmental monitoringproceduressoiltheoretical modelturkey (bird)water conservationRecharging (underground waters)Article10.1007/s10661-019-7792-6