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Lehigh_____________________________ 12 10 Heart River near Richardton__________________ 13 11 Heart River near Glen Ullm and near Mandan___ Green River near Gladstone, Antelope Creek near Carson, Big Muddy Creek near Almont, and Sweetbriar Creek near Judson___________ 15 13-15 Graphs showmg 13 RelatiOn of mean annual flow to dramage area___ 16 14 Duration of records and samphng frequency for sediment statiOns__________________________ 15 Streamflow and sediment concentratiOns________ 18 16-18 Graphs showmg relatiOn of suspended-sediment discharge to streamflow for 16 Heart River near South Heart and near Richardton, 1951 water year________________________ 17 Heart River near Glen Ullin__________________ 21 18 Heart River near Mandan_____________________ 22 19-21 Graphs showmg sediment discharge 19 Annual suspended-sediment discharge for Heart River near South Heart, near Richardton, and near Mandan______________________________ 20 RelatiOn of unmeasured sediment discharge to streamflow for Heart River near Richardton___ 21 RelatiOn of-unmeasured suspended-sediment discharge to measured suspended-sediment discharge for Heart River near Richardton______ 22 Photograph showmg accumulatiOn of sediment from debns fall along the Heart River___________________ 23 Photograph showmg headcut and gully________________ 24 Graph showmg duration of records and samphng frequency for chemical-quality stations________________ 25 Tnhnear diagram showmg percentage compositiOn computed from average concentratiOns for selected ranges of streamflow for Heart River near South Heart, 1947-49_________________________________________ 26 Tnhnear diagram showmg percentage compositiOn computed from average concentrations for selected ranges of streamflow for Heart River near Dickmson, 1946-47_ 27 Diagram for classification of water for IrrigatiOn, Heart River near DICkmson_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 28 Trilinear diagram showmg percentage compositiOn computed from average concentrations for selected ranges of streamflow for Heart River near Richardton, 1946-50_________________________________________ 29 Trilinear diagram showmg percentage compositiOn computed from average concentratiOns for selected ranges of streamflow for Heart RIVer near Glen Ullm, 1945-49_ 30 Diagram for classificatiOn of water for urigahon, Heart River near Glen Ulhn_____________________________

Ground water historically has been vital to the development of Wyoming. In many parts of the State, surface water either is fully appropriated or is not present in large quantities. Although less than 10 percent of all water used is ground water, 62 percent of the State's population is served by ground water. Of the total amount of ground water used, 60 percent is used for irrigation, 30 percent for industrial supplies, 7 percent for public water supplies, and 3 percent for rural supplies. Depending on the location in the State, the most important issues related to ground water in Wyoming are: Availability of ground water, Impaired water quality, and Hydrologic effects of energy-resource development.

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