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Show 20 Utah Geological and Mineral Survey Water- Resources Bulletin 21, 1976 Table 8. Estimates of ground- water inflow to Great Salt Lake, in acre- feet. Farmington Bay ( area 5, fig. 3) Bear River Bay ( arc; i I, fig. 3) Bear River Bay- Syracuse ( areas 2 and 4, fig. 3) South part North part Antelope Island Jordan Valley East shore Subtotal Promontory East shore Subtotal Total Monthly inflow 125 165 2,000 2.300 Total annual: 6.250 \ 1 2 = 75.000 250 1.000 1.250 1.000 870 830 6.250 stations and inflowing tributaries ( table 7). Just below site 10170490, the Surplus Canal diverts from the Jordan River and the flow path to the Great Salt Lake becomes quite complicated ( fig. 8). The record of the Jordan River at site 10171000 was estimated for 1931- 41 from correlations with records at site 10170500 on the Surplus Canal and site 10170490 on the Jordan River. This record was then extended to site 10172600 on the Jordan River below Cudahy Lane on the basis of correlations of data collected at site 10172600 with that of data at site 10171000 and tributary sites 10171600 ( Parleys Creek) and 10172500 ( City Creek). Attempts were made to extend the record at site 10172600 to the dike outlets on the basis of monthly measurements made of outflow from the Farmington Bay Waterfowl Management Area during 1974 ( table 5). The results of table 5 are as inconclusive as that of table 4 for extension through the 1931- 73 base period. Therefore, the flow estimated for site 10172600 was combined with the flow estimated for site 10170800 ( QJR in fig. 6) and extended to the outlets of the waterfowl management area and duck clubs in a manner similar to that used for the lower reaches of the Bear and Weber Rivers. Part of the water diverted into the Surplus Canal eventually ends up within the duck club diked areas and some is diverted to Goggin Drain, most of which drains into the south part of Great Salt Lake. Most of the water that flows into the duck club diked areas is water that passes site 10170800 ( fig. 8). The flow at site 10170800 was measured during 1964- 68, and the record was extended to 1931- 73 on the basis of correlations of flows at site 10170800 with flows at site 10170500. The water diverted from the Surplus Canal to the Goggin Drain was estimated by subtracting the flow passing site 10170800 from the total originating at site 10170500 and correlating with the combined flows of Goggin Drain and the North Point Consolidated Canal at sites 10172630 and 10170700. Miscellaneous Inflow Seven tributaries ( QWF in table 7 and fig. 6) between the Weber River and the Farmington Bay Waterfowl Management Area had short- term records, which were correlated with the flow of City Creek ( site 10172500 in fig. 6) for the entire 1931- 73 base period. Although the seven short- term sites were along the slopes of the Wasatch Range and far removed from the lakeshore, they were the only means available for estimating inflows from tributaries along this part of the shoreline. Intermittent measurements were made at points on these tributaries near the shore of the lake during 1971- 73, but additional measurements will be needed in order to extend the records of the upstream sites to the sites nearer the lakeshore. Kennecott Drain and Lee Creek also drain directly into the south part of Great Salt Lake. Efforts to correlate short- term records at sites 10172640 on Lee Creek and 10172650 on Kennecott Drain were not successful. The average monthly flow at both sites was computed for the records at both sites ( 1963- 68, 1971- 73) and used for the remaining part of the 1931- 73 base period. Records of inflow were compiled for five sewage plants, all of which discharge their effluents directly into Farmington Bay. The largest of these plants is the Salt Lake City sewage plant. The total monthly discharge from these plants during 1959- 73 is shown in table 16. Ground- Water Inflow Ground- water inflow to Great Salt Lake ( Ig) is difficult to distinguish from other sources of inflow because of fluctuations of the shoreline during the 1931- 73 base period. The base altitude used for estimates of ground- water inflow to the lake was 4,200 ft ( 1,280.2 m). The lowest altitude recorded during the base period ( 1931- 73) was 4,191.35 ft ( 1,277.5 m) in 1963. The shoreline in many parts of the lake at that time was several miles downstream from its position when the lake was at an altitude of 4,200 ft ( 1,280.2 m). The flow of some streams increased due to |