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Show Waddell and Fields- Model for Evaluating the Effects of Dikes on the Water and Salt Balance of Great Salt Lake 27 Table 19. Example of computer- program output. LAKE ALTITUDES ( FEET) YEAR MONTH NORTH SOUTH 1931 1 4199.16 4199.70 1931 2 4199.20 419V. 72 1931 3 4199.15 4199.69 1931 4 4198.96 4199.53 1931 5 4198.66 4199.24 1931 6 4198.19 4196.76 1931 7 4197.64 4196.15 1931 8 4197.14 4197.60 1931 9 4196.84 4197.26 1931 10 4196.74 4197.16 1931 11 4196.82 4197.24 1931 12 4196.96 419/. 41 1932 1 4197.15 4197.62 1932 2 4197.31 4197.77 1932 3 4197.38 4197.88 1932 4 4197.34 4197.69 1932 5 4197.25 -• 197.67 1932 6 4197.03 4197.64 1932 7 4196.67 4197.21 1932 8 4196.30 419b. 78 1932 9 4196.10 4196.54 1932 10 4196.07 4196.50 1932 11 4196.22 4196.66 1932 12 4196.41 4196.88 RECOMMENDATIONS FOR FUTURE STUDY The model developed during this study was based to a large extent on data collected during the short timespan of 1971- 74. Most of these data were collected to extend records from long- term upstream stations to downstream points nearer the lakeshore. Because the lakeshore may fluctuate for many miles, the change of flow between the long- term stations and the lakeshore may have a high variability. If the model is to be refined, the following program should be carried out: 1. Compute evaporation using a different method than that used for this report. The energy budget or mass transfer techniques would provide an independent check of computations made for this report. 2. Verify quantity and quality of ground- water discharge. 3. Monitor stream discharge and water quality as near the shoreline as possible, in conjunction with long- term monitoring stations upstream. 4. Monitor storage changes in waterfowl management and refuge areas between shoreline gaging stations and long- term gaging stations upstream. 5. Monitor lake- surface altitudes and salinity in the north and south parts. 6. Monitor discharge and specific gravities in the east and west culverts of the causeway of the Southern Pacific Transportation Co. LAKE ( : 0NCENTRATI0NS ( GRAMS PER LITRE) NORTH SOUTH DIKE 337.649 204.770 124.763 337.578 205.856 104.213 339.511 207.485 89.522 344.558 210.247 82.333 351.479 214.419 81.659 356.*! 79 220.969 86.376 356.466 229.154 95.634 356.385 236.784 105.295 355.896 241.930 106.840 355.337 243.907 91.317 353.604 242.9b4 72.704 351.414 240.274 51.574 348.713 236.587 42.409 346.997 233.717 35.456 347.499 231.560 27.601 350.663 230.267 20.600 355.244 226.827 14.692 355.725 229.127 13.497 356.094 232.509 14.699 356.076 237.159 16.390 355.61V 240.082 16.602 355.244 240.353 14.087 352.764 237.839 11.330 349.632 234.274 8.462 Recalibrate the model using refined estimates of the parameters in the water budget. 8. Improve the salt- balance predictions for the diked areas by refinement of the water- quality relationships in the model. CONCLUSIONS The inflow from precipitation on the surface of Great Salt Lake during 1931- 73 ranged from 680,000 to 1,260,000 acre- ft ( 840 to 1,550 hm3) per year and averaged 966,000 acre- ft ( 1,190 hm3) per year. The total ground- water inflow to the lake was estimated to be 75,000 acre- ft ( 92.5 hm3) per year. The total annual inflow during 1931- 73 ranged from about 1.5 to 5 million acre- ft ( 1,849.5 to 6,165.0 hm3). The Bear River contributes the largest percentage of the measured surface inflow. The total annual outflow from the lake ( evaporation) ranged from about 2.2 to 4.0 million acre- ft ( 2,712.6 to 4,932.0 hm3) during 1931- 73 and averaged 2.98 million acre- ft ( 3,674.3 hm3) per year. Short- term stations near the shoreline of Great Salt Lake were extended to the 1931- 73 base period by correlation with long- term stations upstream. The standard error of estimate for these correlations ranged from 5.1 to 27 percent of the average. The model treats the salt balance of the diked area from the standpoint of an inflow- outflow balance DIKfc 4200.9J 4201.53 4^ 01. Vo 4201.9b 42U1. bv 4200.9* 4200.15 4199.44 4199.07 4199.30 4199.69 4200.52 4200.65 4200.80 4201.26 4202.05 4202.95 4202.27 4200.9j 4199.78 4199.1b 419V. 23 4199.47 4200.02 |
