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Show 1 60 1 50 - 1 40 - 1 30 1 20 110 - 1 00 90 - 80 70 60 50 40 - 30 - 20 - 1 0 i- i- i- r DEER CREEK RESERVO I R i- i- i 1- r 1 6 1 4 h- 1 2 1 0 - 8 6 4 2 - PROVO RIVER BELOW DEER CREEK DAM Oct. 1940- Sept. 1949 - 9 years h- Average annual discharge . 314 cfs ( 227 , 000 ac re- f t ) Below mouth of Deer Creek ( corrected for discharge of Deer Creek) May 1953- Sept. 1967 - 14 years Average annual discharge 354 cfs ( 256.300 acre- ft) 193839 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 661967 Figure 3.- Graphs of the discharge of the Provo River below Deer Creek Dam and water storage in Deer Creek Reservoir. The Provo River appears generally to be a gaining stream between the gaging stations at Woodland ( site 3, fig. 2) and at Hailstone ( site 4, fig. 2). No tributaries other than ephemeral streams enter this reach of the river; but the Weber- Provo Canal discharge is added to the river in this reach, and the South Kamas and Washington Canal diverts from the river in this reach. Taking these factors into account, the average gain in the Provo River in the reach between Woodland and Hailstone, for the period of record at Woodland, is about 18,000 acre- feet per year. The figure cited is for only 4 years of record, however, and may differ from the actual long- term average. When the records from the Provo River Commissioner's station near Midway are compared with the records from the station near Hailstone ( taking into account the many irrigation diversions between the stations and the inflow from Drain Tunnel Creek), the river appears to gain an average of about 6,000 acre- feet per year between the two stations during the irrigation season ( May- September). A more accurate estimate of the gain of water by the river in Heber Valley can be made by comparing records for the stations near Hailstone ( site 4, fig. 2) and near Charleston ( site 5, fig. 2). The records for the two stations cover different periods of time, but the averages can be compared if they are both representative of the long- term averages for the entire period. No discharge records for any point on the Provo River above Deer Creek Reservoir cover the entire period 1939- 67, but records are available for several other streams that have their headwaters in the same general part of the Uinta Mountains that feeds the Provo River and drain areas of similar precipitation distribution. The discharge records of four of these streams are given on page 12. 10 |