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Scope and purpose of paper.____________________________________ Significance of convection in groundwater flow._________________ 37 Permeability calculated from head and temperature measurements... 42 Conclusion ___________________________________________________ 45 References cited _______________________________________________ 46 Streambed percolation in development of water supplies, by Matthew I. Rorabaugh.____________________________________________________ 47 Abstract ____________________________________________ __________ 47 Scope of the investigation. __ ___________________________________ 47 Acknowledgments. ____________________________________________ 48 Geologic origin of valley-fill deposits in and north of the Ohio River valley _ ___________________________________________________ 48 Requirements for industrial or municipal water supplies ____________ 49 Factors in the practical development of a water supply.____________ 51 Temperature of the water._________________________________ 52 Percolation rates __________________________________________ 53 Quality of water__________________________________________ 55 Performance of a horizontal-type collector southwest of Louisville, Ky________________________________________________________ 56 Conclusion ___________________________________________________ 61 References cited.______________________________________________ 61 A water budget for the artesian aquifer in Odgen Valley, Weber County, Utah, by Harold E. Thomas______.____________________ Abstract_____________________________________________________ Scope and purpose of paper_____________________________________ Geologic and hydrologic features of Ogden Valley._________________ Data available for a hy drologic study of Odgen Valley _____________ Precipitation, __ __________________________________________ Atmospheric pressure.

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