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o (.-) .... W <:'0 VI is little or no dependence on it locally and tberefore structures wbicb can capture and bold the water, for whatever purpose, are viewed favor- ably. Also, in this same clilllatic zone are areas located to the nortb and soutb of the AWR Basins that tbere se~ to be tbe most concern about depletion of streamflow. A number of studies have been IIIlode, are under way, or are proposed in this general area in regard to effects of upstream reservoirs upon downstream water yield. Some are or will be ratber quick appraisals based on available data and others will be more detailed 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 which the Soil Conservation Service has planned in cooperation with the U. S Geological Survey to study ten creek wa tersbeds; seven in Texas, two in Oklahoma, and one in Arkansas. The study includes instrumentation, collection of data for a number of years, and analyses at an estimated cost of more than $600,000 in five years. Much of the instrumentation is already done. The study areas are shown in the table below. State Basin Creek Texas San Antonio River Calaveras Escondido Cow Bayou Green Mukewater Deep and Dry Prong Deep Honey Brazos River Middle Colorado River Trinity River Oklaboma Washita River Ganey River Sandstone Double Arkansas Arkansas River Six Mile This study is referred to in the paper entitled "Investigations of the Hydrology of Small Watersheds in Texas," presented by Trigg Twichell, District Engineer of the U. S. Geological Survey, at the ASCE meeting in Dallas, Texas, February l5, 1956, and in the paper entitled "Soil Con- servation and Upstream Engineering in the Western Gulf States," whicb was presented by Cbarlie M. Moore of the Soil Conservation Service, Fort Worth, Texas, at tbe same ASCE meeting. C/1-9