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I I I I I Table 3. Well Permits, Hay Gulch Alluvium Location Permit No. Discharge Volume (gpm) (ac-ft) NW 1/4, SW 1/4, Sec. 8Y l750l-F 1600 500 NE 1/4, NW 1/4, Sec. 8 17502-F 1600 500 SW 1/4, SW 1/4, Sec. 8 l6644-F 1600 500 SW 1/4, NW 1/4, Sec. 5 l8337-F 1200 320 SW 1/4, NE 1/4, Sec. 5 B338-F 1200 320 Total - - - - 7200 2140 I I I l/All in T3N, R6lW I I I I I I I I I I I Water utilization and proiected water levels The exportation of 1100 to 1500 acre-feet per year from the Hay Gulch alluvium will cause a lowering of the water table until a new equilibrium between recharge and discharge is obtained. It is conservatively estimated that the Hay Gulch alluvium contains 60,000 acre-feet of ground water in storage.1J An average annual discharge of 3000 acre-feet per year to the South Platte alluvium is balanced on the average with an equivalent amount of recharge from precipitation on the land surface overlying the aquifer. The proposed project will remove less than one-half the estimated average annual recharge. In addition, the total volume removed in a 20-year period would be less than one-half the estimated 60,000 acre-feet in storage. It is projected that if no other major water withdrawals are allowed from this aquifer, the water level in the vicinity of the wells will decline approximately 25 to 30 feet and will stabilize at that level by the end of the 20-year period. Such a lowering will reduce the saturated thickness in the vicinity of the wells from the present 90 to 100 feet to about 60 to 75 feet, but well yields of approximately 1000 gallons per minute will still be possible. l/A previous estimate made for the Colorado Ground Water Commission of the amount of storage in the Hay Gulch alluvium was 200,000 acre-feet (Nelson, Haley, Patterson and Quirk, 1967), but test drilling conducted by the Morgan County Quality Water Association (see Appendix A) indicates this figure is too high. - 9 - M, W. BITTINGER AND ASSOCIATES, INC.