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. . the regional economy, Within t.[,,,, A:,IR B"sins, at least, the problem area lies generally between t.h3 ',,6th merioian and the Rocky Mountains with the High Plains portion 0; let1ssr importance because streamflow contribution is so small that there is Httle or no dependpnce on it locally and therefore stn'ctures which can capture and hold the water, for whatever pu rpose, are viewed favorably. Also, in thi s same climatic zone are areas located to the north and south of the A;rJl( Basins that there seems to be the most concern about depletion of streamflow. A number of studies have been made, are under way, or are proposed in this general area in regard to effects of upstream reser- voirs upon downstream water yield, Some are or will be rather quick apnraisals based on available data and oth~rs will be more netailed involving collection of all sorts of relative data during a period of years before conclusions are attempted, a. Ten Basin Study The largest undertaking is that wId ch the Soil Conservation Service has planned in cooDcration with the U. S. Geological. Survey to study ten creek watersheds; seven in T~x~G, two in Oklahoma, and one in Arkansas. The study includes instrumentation, collection of data for a number of years, and analyses at an 8stimat0d cost of more than $600,000 in five years, ~luch of the instrwop.ntati.on is already done, The study ereas are shown in the tahle b2low, State Basin Creek TexaB San Antonio River Brazos River Calaveras Escondido Cow Bayou Gr~en Mukewater Deep and Dry Prong Deep Honey Midr'le Colorado River Trinity River Oklahoma Washita River Caney River Sandstone Double Arkansas Arkansas River Six Hile This study is referred to in the paper entitled "Investigations of the Hydl'ology of Small \~atersheds in Texas, II presented by Trigg Twichell, District Engineer of the U. S. G0'Jlogical Survey, at the ASCE meeting in Dallas, Texas, February 15, 1956, and in the paper entitled "Soil Conservatlon and Upstream Engim,ering in the Weotern GuU States," - 9 -