Residence time ,storage and storage coefficient of covered Karst water in Dachahe area of Pingliang are evaluated by natural isotope based on wellmixed model of water body.

• 应用天然同位素及水体的完全混合模型，计算了平凉大岔河隐伏岩溶地下水的滞留时间、含水层储水系数及储存量。