Murphy 2012 Bruneau River and Murphy Flows Liz

Murphy 2012 Bruneau River and Murphy Flows Liz Cresto September 19, 2012

Assignment: Analyze Bruneau River impacts to the flow at Murphy, particularly during low flow periods.

5600 Minimum Flow Period • Limited to the flows at Murphy to 6500 cfs and less. • Bruneau at Hot Springs greater then 100 cfs. • March is the critical month. • Flows at Murphy 6200 – 7000 cfs and at times the flows on the Bruneau were 200 - 350 cfs. • Irrigation season begins March 15 th, however the limited historical data suggests that diversions below the Hot Springs gage would not divert the entire Bruneau River. Some water from the Bruneau would enter C. J. Strike. • The proposed gage on the Bruneau would provide useful information.

3900 Minimum Flow Period • April – October or during the irrigation season • Limited to the flows at Murphy to 5000 cfs and less. • Bruneau at Hot Springs greater then 200 cfs. • Assumed that flows lower than 200 cfs would likely be diverted by the three main canals. • Any flow that would make it down the main channel would not have significant impact to the flows at Murphy. • June is the critical month. • Flows at Murphy below 5000 cfs and at times the flows on the Bruneau at Hot Springs were 220 - 600 cfs. • Irrigation season begins March 15 th, however the limited historical data suggests that diversions below the Hot Springs gage would not divert the entire Bruneau River. Some water from the Bruneau would enter C. J. Strike.

YEAR 1912 1913 1914 1985 1986 1987 1988 1989 Mean of monthly Discharge Jan Feb Mar 3. 48 2. 46 0. 000 2. 07 11. 7 0. 642 7. 00 7. 19 0. 000 4. 3 3. 1 4. 1 00060, Discharge, cubic feet per second, Monthly mean in cfs (Calculation Period: 1912 -05 -01 -> 1989 -09 -30) Apr May Jun Jul Aug Sep Oct 48. 5 42. 9 15. 5 19. 0 18. 7 15. 9 8. 33 43. 4 32. 7 26. 0 24. 3 21. 3 12. 1 21. 1 45. 3 18. 8 71. 7 64. 8 66. 0 49. 0 17. 8 18. 3 16. 8 69. 5 64. 9 73. 8 64. 8 58. 2 29. 5 57. 6 79. 1 67. 5 50. 1 34. 0 28. 3 35. 1 45. 2 66. 5 65. 3 55. 1 34. 1 37. 3 37. 7 15. 5 62. 7 59. 3 56. 8 49. 1 43. 3 26 61 57 49 39 32 25 Nov 16. 1 8. 77 Dec 11. 6 1. 99 12. 5 6. 90 12 6. 8

YEAR 1985 1986 1987 1988 1989 Mean of monthly Discharge 00060, Discharge, cubic feet per second, Monthly mean in cfs (Calculation Period: 1985 -04 -01 -> 1989 -07 -31) Jan Feb Mar Apr May 15. 3 6. 35 Jun Jul Aug Sep Oct Nov 26. 3 24. 1 23. 8 28. 8 31. 5 27. 9 27. 1 24. 5 28. 7 27. 2 22. 4 21. 3 14. 0 13. 9 12. 4 19. 8 17. 8 11. 3 6. 38 14. 2 16. 0 30. 4 21. 5 29. 5 35. 8 26. 1 13 29 27 27 18 15 13 18. 6 13. 3 Dec

South Side Bruneau Canal 13169140 Misc. Field Measurements. Max measurement 47 cfs in June 1987.

Buckarooo Canal Entering C. J. Strike

End of Bruneau Southside Canal