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Show and 1973). A model study of the Upper Jordan River drainage was carried out by Wang et al. ( 1973). Under current studies at the Utah Water Research Laboratory, the high resolution QUAL model ( Texas Water Development Board, 1970) and the intermediate resolution ( Utah State University River Model - USU RM - Grenney et al., 1974) model are being used to provide simulation models of waste load allocation on each of these rivers. These models cover the We- ber- Ogden system from Park City to Kamas to Great Salt Lake, the Jordan River from the Jordan Narrows to Great Salt Lake, and the Bear River from the Utah- Idaho border to Great Salt Lake. Several studies of the smaller drainage areas of Great Salt Lake also have been performed. A water budget study of the Great Salt Lake Desert area, similar to the water budget analysis of the major rivers, was prepared by Foote et al. ( 1971). The water resources of Salt Lake County were discussed in Hely et al. ( 1971) and later simulated in a computer model ( Israelsen et al., 1973). Future water use in Utah Valley was modeled by Huntzinger ( 1971). A water resource allocation model of the entire State of Utah, including Great Salt Lake, has been developed at the Utah Water Research Laboratory ( Keith et al., 1973). The contribution which groundwater makes to the inflow to Great Salt Lake has not been well established. Lofgren ( 1954) estimates the groundwater inflow to be 30 percent of the total inflow. Current investigators have placed the groundwater contribution at 6- 10 percent of the total annual inflow. Many of the estimates of total groundwater inflow to Great Salt Lake have come from water budget studies which estimate the groundwater inflow by balancing inflow, outflow, and storage change in the lake. Major components in a water budget study of Great Salt Lake are evaporation and precipitation on the lake. The accuracy of estimating groundwater inflow using wate budget studies should be accepted with the realization that neither evaporation nor precipitation on the lake is well defined. Groundwater conditions in Utah are investigated by the Utah Department of Natural Resources and the U. S. Geological Survey ( USGS). Foote et al. ( 1971) used the data available on groundwater conditions in the Great Salt Lake Desert to estimate the average annual groundwater inflow to the lake from this area. Studies of this nature should provide better estimates of the total groundwater inflow to Great Salt Lake than estimates made by water budget analysis. Additionally, this type of study provides information on the spatial variation of groundwater inflow. The near shore area can be considered as a strip of land around the perimeter of Great Salt Lake which contains the marshlands, chemical extraction industries, and sites for recreational facilities. The water requirements for waterfowl marshlands in the vicinity of Great Salt Lake were studied under an extensive project which began in 1959 as a cooperative effort of the Utah State Division of Fish and Game, the Utah Water Research Laboratory, and the USU Cooperative Wildlife Unit. The investigation took place on the Howard Slough management area and the data gathered were used to develop a procedure for determining the monthly and seasonal water requirements for marshlands. The results of the study are summarized in Christiansen and Low ( 1970). This report presents amethod for calculating marshland water requirements based on the salinity of flow, the evapotranspiration ( consumptive use) from the marshland, and the precipitation on the marshland. The study not only provided a means for estimating water requirements of marshlands, but also through the development of the necessary background information and data, provided insight into the tolerance of marsh plants to salinity and the evaporation losses to be expected within marshlands. Marshlands often provide the necessary environment for producing mosquitos. Methods of mosquito control on marshlands through the proper regulation of water levels were described by Rees et al. ( 1966). In this series of studies it was shown that water management techniques and practices effectively used in mosquito abatement often improved the marshes for waterfowl and other wildlife. Great Salt Lake is an important component of the entire Great Salt Lake system. Physical processes within its boundary have been studied in a series of single purpose studies with the goal of describing specific aspects of the lake system. Evaporation, perhaps because it is the only outflow from Great Salt Lake, has been the subject of a number of studies. In 1932, T. C. Adams established a method of estimating the evaporation from the Great Salt Lake by correlating pan evaporation of salt and fresh water. The work done by Adams has been referred to in most of the subsequent studies of evaporation from Great Salt Lake. Harbeck ( 1955) investigated the effects of salinity on evaporation from a theoretical basis and used the results obtained by Adams to verify his findings. Dickson, Yepsen, and Hales ( 1961) performed laboratory measurements of the vapor pressure of Great Salt Lake brine at various concentrations and temperatures. Dickson ( 1962) and Dickson and McCullom ( 1965) used vapor pressure, wind speed, temperature, and 29 |