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<br />DRAFT <br /> <br />. <br /> <br />(2) The natural contribution estimated to be produced in the <br /> <br />absence of manls activities. <br /> <br />(3) The induced contribution resulting from the natural climatic <br /> <br />o <br /> <br />forces working in a disturbed environment. <br /> <br />According to reports by the U. S. Geological Survey and the <br /> <br />Comprehensive Frame"70rk Study,. Upper Colorado River Basin, total <br /> <br />yearly dissolved solids from natural springs in Colorado amount <br /> <br />~o 544,200 tons; from other natural sources in Colorado 2,522,300 <br /> <br />tons per year; and from irrigation return flows in Colorado <br /> <br />2,265,090 tons per year. <br /> <br />0250 <br /> <br />c. Land Use Problems <br /> <br />Today's land use patterns are not the result of a systematic, planned <br /> <br />. <br /> <br />allocation to uses for which the land is best adapted. Land is culti- <br /> <br />vated that should be grazed. Cities, highways and industries take over <br /> <br />good farm land, and some poor soils are farmed that should never be. <br /> <br />Colorado is one of the fastest growing states in the Nation. People <br /> <br />from all parts of the United States are coming here to live permanently <br /> <br />or to develop second homes for recreational purposes. This has caused <br /> <br />a land-boom of gigantic proportions allover the state. In this rapid <br /> <br />development, there has been little recognition of the geological and <br /> <br />engineering constraints of present and potential landslides, mudslides, <br /> <br />and avalanche areas; swelling and settling soil areas; steep slopes; <br /> <br />fractures, faults, and earthquake-prone areas, subsidence of land due <br /> <br />to withdrawal of water and minerals. Neither has there been adequate <br /> <br />recognition of the geological problems in septic-tank pollution, mine <br /> <br />... tailings, solid waste disposal in landfill and gravel-pit areas, and <br /> <br />sanitary water availability. <br /> <br />d. Land Erosion <br /> <br />^.... <br />