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Show 14 Utah Geological and Mineral Survey Water- Resources Bulletin 21, 1976 Table 5. Net change of flow, in cubic feet per second, between the Jordan River ( 2100 South) and the outlets from duck clubs and Farmington Bay Waterfowl Management Area, [ see fig. 6 for location of sites] Date Site 10172630 Two- day average Site 10170500 plus 10171000 Two- day average Site 10170500 plus 10171000 minus 10172630 Farmingtc Man a plus m Bay Waterfowl gement Area duck clubs Net gain(+) or loss(-) 12- 18- 73 12- 19- 73 29 29 29 713 696 705 676 634 - 42 1- 23- 74 1- 24- 74 375 377 376 911 907 909 533 666 + 133 2- 27- 74 2- 28- 74 361 370 366 980 994 987 622 538 - 84 3- 28- 74 3- 29- 74 3- 30- 74 3- 31- 74 4- 1- 74 434 430 423 423 400 422 900 906 960 953 932 930' 508 538 + 30 5- 2- 74 5- 3- 74 425 381 403 688 638 663 260 819 + 559 5- 30- 74 5- 31- 74 533 475 504 1.102 1,079 1,091 587 769 + 182 6- 25- 74 6- 26- 74 36 42 39 662 640 651 612 296 - 316 8- 26- 74 8- 27- 74 18 23 21 522 516 519 498 239 - 259 10- 2- 74 10- 3- 74 24 23 24 414 458 436 412 244 - 168 1 Five- day average. The net change of flow from State Highway 83 to the dike during 1931- 73 was estimated by determining the net change due to precipitation and evaporation within the intervening area and then adding or subtracting any other gain or loss as determined by the calibration of the model. ( The precipitation and evaporation rates used are shown in table 2.) This is discussed in a later section under " Calibration of model." dike of the Ogden Bay Waterfowl Management Area was assumed to be the inflow point to Great Salt Lake, and the gain or loss from precipitation and evaporation on the management area was computed from data given in table 2. Any unmeasured change in flow in the management area was incorporated as part of the unmeasured inflow computed as part of the model calibration discussed in a later section under " Calibration of model." Weber River Jordan River Basin The gaging station on the Weber River near Plain City ( site 10141000) is the site nearest Great Salt Lake with a record that incorporates the entire 1931- 73 base period. Records for site 10141000 were used to extend the record of four short- term stations ( QWR in table 7 and fig. 6), which monitored the total flow of the Weber River during 1971- 73 as the water either entered or bypassed the Ogden Bay Waterfowl Management Area ( fig. 6). Monthly gains were recorded during 1971- 73 between the long- and short- term sites, the flow at the sites correlated well, and the average monthly gains for 1971- 73 were used to extend the short- term records for the 1931- 73 base period. The The discharge of the Jordan River to Great Salt Lake was obtained by extension of the flow in the river to the outlets of the Farmington Bay Waterfowl Management Area and the duck club outlets west of the management area. Several correlations from upstream stations with various intervals of record were required for extension through the 1931- 73 base period. Streamflow records of the Jordan River at Salt Lake City ( 2100 South) ( site 10170490) are available for 1942- 73. These records were extended through 1931- 73 on the basis of correlations with upstream |