OCR Text |
Show for 14 years ( through water year 1967) was 256,300 acre- feet per year ( fig. 3). The average diversion through the Salt Lake Aqueduct during the same period was 21,800 acre- feet per year, hence the total outflow from Deer Creek Reservoir averages about 278,000 acre- feet per year. During the 14- year period 1953- 67, an average of about 12,100 acre- feet per year was diverted from the drainage basin through irrigation canals to Rhodes Valley. Thus, the total discharge of surface water from the Provo River drainage basin averages about 290,000 acre- feet per year. The above total discharge from the drainage basin, however, includes an annual average of about 68,000 acre- feet of water that originates outside the drainage basin and enters the Provo River through interbasin diversions. About 33,500 acre- feet per year is diverted through a tunnel from the Duchesne River, about 31,300 acre- feet per year comes from the Weber River through the Weber- Provo Canal, and about 3,300 acre- feet per year comes from the Strawberry River system through ditches. After deducting these diversions, the total surface outflow from the Provo River drainage basin above Deer Creek Dam averages about 222,000 acre- feet of water per year. ( Graphs of the diversions into and out of the basin are shown in fig. 4.) At present ( 1968), the U. S. Geological Survey operates four gaging stations on the Provo River and its tributaries above Deer Creek Dam ( in addition to the measurements of diversions to the river). Three additional gaging stations were operated during the period 1938- 50. The average discharges at these stations for the periods of record are tabulated below. Station 10- 1535. Provo River near Kamas 10- 1538. North Fork Provo River near Kamas 10- 1542. Provo River near Woodland 10- 1550. Provo River near Hailstone 10- 1555. Provo River near Charleston 10- 1560. Snake Creek near Charleston 10- 1585. Round Valley Creek near Wallsburg 10- 1595. Provo River below Deer Creek Dam - Drain Tunnel Creek near Hailstone Provo River near Midway Site number in fig. 2 Period of operation Years of record Average discharge ( acre- feet per year) 1 1949- 67 18 36,130 2 1963- 67 4 30,250 3 1963- 67 4 178,850 4 1950- 67 17 203,000 5 1938- 50 12 139,000 6 1938- 50 12 33,159 7 1938- 50 12 9,629 8 1953- 67 14 256,300 9 1949- 67 18 12,000 10 ( 2) Operated by Provo River Commissioner's office. > " Irrigation season only. The Provo River Commissioner's office maintains records of all diversions from the river, and during the irrigation season ( May- September) the Commissioner's office operates a gaging station on the river near Midway ( site 10, fig. 2). The records for this station are not included in the table, because they cover only a part of each year and are not comparable to the annual averages at other stations. 9 |