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It is therefore proposed that the comprehensive program of basic-data collection, general fact-finding, and hydrologic interpretation which the Geological Survey has had under way for several years be materially increased and be considered as an integral part of the plan for further Lower Colorado River development. This program of investigation involves all aspects of arid zone hydrology. Studies included in this accelerated program should include not only increased collection of data on stream flow and water quality and an accelerated study of the ground water resource, but also should include investigations of the relations of upland vegetation to water supply, effects of stream control on ground water recharge, transmission losses and gains in relation to the effects of grazing and land management on water supply and water quality, and the effects of growing urbanization on stream drainage and water quality. This broad program of hydrologic investigation in connection with the Lower Colorado River development should be specifically aimed at increased knowledge about water as a resource. This responsibility in the Department is carried by the Geological Survey and that agency will plan and carry forward these broad resource investigations.Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,215,168 byte