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time insuring that structure specifications are adequate for the hydrologic conditions likely to be encountered. 2. Effects of Public Land Disposition and Use on the Water Problems and Needs: The previously described public land uses and practices all, in same way, involve the need for more efficient water utilization. The vast majority of public lands are not serviced by external waters. The present utilization of the public lands is almost entirely dependent on local groundwater sources, and as the uses intensify on the public lands, the water situation will become more and more critical. Expanding range, wildlife, recreation, and agricultural uses, as well as urban development, will strain local water sources on the public lands. As land uses are intensified, better management of existing water sources will be required. Certain high uses of the public lands have been curtailed because of prior appropriation of available water for a specific use, e.g., recreation use is sometime precluded because of existing livestock or agricultural use. In many instances, the sale or transfer of public lands directs the lands into a high water-consuming use. For example, the sale or transfer of public lands may result in their development as irrigated farmland, thus further depleting the strained underground 20Epson Perfection 4870 Photo, 400 dpi, 8 bit, 16,023,552 byte