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The Colorado Basin ~ 00 ~ ~ Salt Lake County is presently using water from the Wasatch Mountain streams issuing from the east margin of the county. Although these streams are tributary to the Jordan River, some flows are diverted and/or stored prior to entering the Jordan, and return flows and unused flows reach the Jordan via physical works. About 41,000 acre-feet is presently used from this source, and additional storage and distribution facilities (e.g., Little Dell and Argenta) and better integration and management could possibly supply an additional 50,000 acre-feet for Salt Lake County. Another source of water to the Wasatch Front is the streams rising on the south slope of the Uinta and east slope of the Wasatch Mountains. Development of a portion of this resource will be accomplished through the Bonneville Unit of the Central Utah Project now under construction.U1ti- mate development of the Central Utah Project could result inasmuch as 350,000 acre-feet being diverted to the Great Basin. Groundwater Groundwater represents a sizeable undeveloped water resource of the Wasatch Front. It is estimated that 200,000 to 300,000 acre feet of ground- water could be obtained annually without overdraft of,the groundwater basins. Unfortunately, the legal problem regarding protection of the means of diver- sion (i. e., piezometric head) must be resolved before this resource may be fully exploited. This water source appears to be the least costly to develop of those which can be considered as alternatives. Reclamation and/or Reuse of Return Flows Water reclamation and resue is another method of increasing the effective water supply of the Wasatch Front. This potential falls into three categories. First, water needing no treatment of any kind may merely be reused after picking up previously diverted water. This is practiced presently in a11 basins and results in greater than 100 percent use of the dependable water supply. Present preliminary studies have not yet been extended to the point where an estimate can be made of the possible magni- tude of this type of reuse in the future. A second reuse potential is that afforded by the increasing outflow of unconsumed waters from urbanized areas. Most of this water passes through sewage treatment plants and could be reused for industrial and agricultural purposes with further treatment. It is esti- mated that the present outflow from urbanized areas along the Wasatch Front is 300,000 acre-feet per year and will increase to 1,000,000 acre-feet by the year 2020. -29-