Walter F. Holmes Heidi K. Shlosar D. Michael Roark 1991 <p>An investigation of the hydrologic system in Heber and Round Valleys was conducted to improve understanding of the surface-water and ground-water hydrology and the effects caused by changes in recharge. &nbsp;Ground water is present in consolidated rocks and in unconsolidated valley-fill deposits, but the principal ground-water reservoir is in the unconsolidated valley-fill deposits.</p><p>Recharge to the unconsolidated valley-fill deposits in Heber Valley from unconsumed irrigation water, stream infiltration, subsurface inflow from consolidated rocks, and precipitation is estimated to be 154 cubic feet per second. &nbsp;Discharge is by leakage to Deer Creek Reservoir, by springs and seeps, by seepage to the Provo River and other streams, by evapotranspiration, and by pumping from wells.</p><p>Recharge to the unconsolidated valley-fill deposits in Round Valley from stream infiltration, precipitation, unconsumed irrigation water and subsurface inflow from consolidated rocks is estimated to be 11 cubic feet per second. &nbsp;Discharge is by springs and seeps, by evapotranspiration, and by pumping from wells.</p><p>Seasonal water-level fluctuations of up to 30 feet occur primarily because of changes in recharge from unconsumed irrigation water.&nbsp; Water levels generally are highest during June or July when recharge from irrigation is at a maximum and lowest during the winter when irrigation is absent and recharge is at a minimum. &nbsp;Water levels in wells near Deer Creek Reservoir respond to changes in the reservoir level.</p><p>A modular, three-dimensional, finite-difference ground-water flow model developed by McDonald and Harbaugh (1988) was used to simulate the hydrologic system in the unconsolidated valley-fill deposits of Heber Valley. &nbsp;Model simulations indicate that decreased recharge to the unconsolidated valley-fill deposits causes a decrease in discharge to springs and seeps, streams, and leakage to Deer Creek Reservoir. &nbsp;Future decreases in ground-water recharge caused by changing from flood- to sprinkler-irrigation methods will cause future decreases in ground-water discharge that will be offset to some extent by increased surface-water flows.</p> application/pdf en Utah Department of Natural Resources, Division of Water Rights Hydrology of Heber and Round Valleys, Wasatch County, Utah, with emphasis on simulation of ground-water flow in Heber Valley reports