Less than 0.50 ppm 0.5 to 1.5 ppm More than 1.5 ppm Strontium zone boundary 22 Sampling site number Figure 1. Map of the United States showing concentration of strontium in surface water at selected sites

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Hydrology.-..._________________________________________________ Hydrologic cycle._____________________________________________ Pre cipitation. __ _ ____________________________________________ Recharge-.._________.______________________________ Discharge___-______________________________________________ Ground water in storage..-.__________________________________ 31 Development of surface water_____________________________________ 32 Development of ground water_____________________________________ 32 Chemical quality of the ground water, by C. Albert Horr_____________ 35 Definition of terms____________________________________________ 35 Factors affecting the water quality.____________________________ 36 Water quality in relation to hydrology.__________________________ 36 Water quality in relation to geology_______._____________________ 38 Water quality and use-______-________-___________-_-___-_-38 Domestic use________-_________________________________.__ 38 Stock use...____________________________________________ 41 Irrigation use_____________________________________________ 42 Summary and conclusions_______________________________________.__ 46 References cited._________________________________________________

Previous work_________________________________ ___________ 2 Methods of investigation_______________________________________ 3 Well-numbering system______________________________________ 4 Acknowledgments.