| OCR Text |
Show by the Bonneville Unit. Return flows from Unit supplies would accrue to the Jordan River. These flows, estimated to be approximately 30,000 acre- feet per year, and flood flows and spills from Utah Lake would be regulated in the proposed Lampton Reservoir. This would have the effect of reducing high runoff flows and increasing the base flow of the river during the late summer months. Unit municipal and industrial water used for watering lawns in previously non- irrigated areas could increase the recharge to the groundwater aquifers but the effect would probably be small. In Utah Valley the additional 20,000 acre- feet of municipal and industrial water would make possible greater use of existing variable supplies. Increased use of high flows from front streams would occur with increased demands. This would increase municipal and industrial return flows to Utah Lake. Winter and high runoff flows from Provo River to Utah Lake would be reduced. Unit return flows plus evaporation savings from the diked lake and water released from Strawberry Reservoir would, however, preserve lake yields. The application of additional irrigation water would increase groundwater recharge and drainage flows entering the lake from the shallow zone. Irrigation of new lands on the benches in south Utah Valley could increase recharge to the confined aquifer zone. Groundwater recharge from the Provo River could be reduced slightly due to withholding winter flows at Jordanelle. The application of additional irrigation water in Juab Valley would result in additional return flows in natural and artificial drainage channels. As in Utah Valley, the application of additional irrigation water- particularly on the more permeable bench areas - should increase groundwater recharge. Delivery of Unit water to Sevier Bridge Reservoir would make possible the withholding of water now released from Piute Reservoir to Sevier Bridge Reservoir to equalize rights and make this water usable in the central Sevier area. Unit " exchange" water in Sevier Bridge Reservoir would also make possible a testing program to determine the feasibility of phreatophyte salvage by groundwater pumping without interference with established rights. In the Uinta Basin high runoff and winter flows at the Strawberry Aqueduct would be diverted to the enlarged Strawberry Reservoir and into the Bonneville Basin. Starvation Reservoir would capture high runoff flows to provide replacement water to downstream rights. Additional late season water would also be supplied. The Indian deferral agreement guarantees the non- Indian user continued use of natural flows of the Duchesne system at least to the year 2005. Canal lining programs could reduce required diversions and recharge to the shallow water table aquifers. The effect would be small and would benefit present high water table lands. 392 |
