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Ii;' ... . % . Chemical Quality and Sedimentation Missouri River Basin Quarterly Progress Report March 1957 Chemical Quali tv The chemical quality program supported by }1:issouri Basin project funds consists of investigations of surface and ground waters. At the end of the quarter the program included investigations at 61 quality stations on streams, reservoirs, and lakes, Ground water quality investigations included the partial preparation of two chemical quality sections and the review and revision of sections previOl1sly released in ground water reports. Till preparation of a progress report on the chemical quality and sediJIIBnta- tion of surface waters in the Grand River basin, South Dakota, was continued. Basic data were compiled and released as completed. The irrigation network program supported by Geological Survey funds was' continued. This program included the investigations of the chemical quality of surface waters at 3 main stem and 11 tributary stations. The compilation of data for the 1955 water year was completed. Sedimenta tion The sedirn.entation program supported by Missouri Basin project funds included investigations of the sediment discharge of streams at 37 stations in the Red River of the North, Big Hole, Gallatin, Marias, Willow Creek, Yellowstone, White, James, Niobrara, Platte, and Kansas River drainage basins; and studies of variable hydraulic parameters for sediment transport for the Middle Leup River near Dunning, Nebraska. Field data for the transport study representing water temperature and hydraulic conditions were compiled and transmitted to the Bureau of Reclamation. Sediment station data were released as completed. The report "Erosion and deposition as indicated in stocK ~~ter reservoirs in the Powder River basin" was revised and submitted for open file release. The report "Simplified methods for computing the total sediment discharge by the }lodified Einstein procedure" was nearly completed. Sedimentation investigations in the !find- and Cheyenne River basins which were supported by funds transferred by the Bureau of Reclamation were continued. Studies of upland erosion and deposition to provide basic information on land treatment practices were conducted in conjunction wi th hydrologic studies in the Willow Creek area, Montana, the Hind River and Bighorn BaSins, Wyoming, and in the Box Creek area of the Cheyenne ITN IF C~1 :i I r _tn )i)-" , , .)f CO,. I' l'-'.:.r[R CONSfR\'M" ,