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<br /> <br />control. As managed uses increase, the reuse of return flows will also have to in- <br />crease, causing a general deterioration of water quality to downstream users. <br /> <br />Land <br /> <br />Land requirements for specific purposes increase in proportion to production <br />needs. Since the land base is fixed, satisfying these needs constitutes a change in land <br />use generally from uses of lesser to higher economic value. The net result in the <br />Great Basin has been a reduction in idle land and in land use for grazing. Projected <br />land use requirements for the region are shown in illustration 15. <br />Although the land base of the region is large in comparison to total demands, <br />areas suitable for some specific purposes are limited. Land suitable for timber pro- <br />duction is extremely limited and projected demands cannot be met. Land suitabll' <br />for certain types of recreation is also limited and projected needs can only be met by <br />substitution of other types of recreation. <br />Suitable watershed, wilderness, scenic and wildlife habitat land is also limited. <br />These areas need to be managed principally for these purposes. Land use and devel- <br />opment have been primarily controlled by the presence of water. <br />The resultant intensive development of these areas has caused considerable com- <br />petition between some uses. Urbanization and irrigation both rely upon water for <br />development. Prime irrigated land has been shifted to urban use and new irrigated <br />iands have been developed, often far removed froin the source of water supply. With <br />urbanization, flood control, water quality and land management problems have also <br />increased. <br />There is a need for more intensive land management, better fire control and <br />zoning regulations to protect the land, particularly the fragile lands where the soil <br />mantle is thin and where vegetation is difficult to restore. Multiple uses of land, <br />consistant with good land management, need to be given prime consideration. <br /> <br />PRINCIPAL LAND USE IN 1965 AND PROJECTED NEED FOR 2020 <br /> <br />1965 <br />2020 <br />(AVAIl. 2020l <br />URBAN AND 1965 <br />~ INDUSTRIAL 2020 <br />=> <br />Cl 1965 <br />~ 2020 <br />-' <br /> <br />IRRIGATION <br /> <br />DRY LAND <br /> <br />GRAZING <br /> <br />TIMBER <br /> <br />RECREATION <br /> <br />WILDERNESS 1965 <br />SCENIC 2020 <br />FLOOD CONTROL 1965 <br />STRUCTURES 2020 <br />MINERALS 1965 <br />2020 <br />WATERSHED 1965 <br />2020 <br />TRANSPORT A TlON 1965 <br />AND UTILITIES 2020 <br /> 0 <br /> <br /> <br />1965 <br />2020 <br />1965, <br />2020 <br />1965 <br />2020 <br /> <br />60,820 <br /> <br />. ;Ill <br />8,656 <br /> <br />2 3 4 5 <br />MILLION ACRES <br />Illustration 15 <br /> <br />18 <br />