Draft EIS_072312.pdf - Middle Fork American River Project ...

74
Exceedances
and
Summary
Statistics
Flow (cfs) 1975–2007
Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
Average 389.4 676.9 1,137.9 1,532.3 1,852.7 1,900.6 1,620.7 1,481.1 1,021.3 758.0 711.6 572.2
Max 2,910.0 15,500.0 35,700.0 64,500.0 46,400.0 23,200.0 19,500.0 23,500.0 4,430.0 3,640.0 1,230.0 1,260.0
Min 41.0 51.0 54.0 75.0 79.0 79.0 69.0 76.0 50.0 64.0 65.0 65.0
Middle Fork American River—Above Otter Creek (860.863)
20% 749.5 850.7 1,231.5 1,996.9 2,406.1 2,823.7 2,326.6 2,202.5 1,418.6 1,015.5 990.4 837.6
50% 194.0 581.0 622.5 790.6 1,215.1 1,589.7 1,380.3 1,218.5 811.7 747.4 752.9 605.6
80% 100.2 196.0 217.5 295.2 460.9 653.3 490.3 342.8 439.6 486.5 493.5 249.6
Average 396.4 688.5 1,158.1 1,557.5 1,882.8 1,933.6 1,655.2 1,518.8 1,043.0 767.8 718.1 578.4
Max 2,996.6 15,794.0 36,242.7 65,335.7 47,434.6 23,560.3 19,822.3 23,741.4 4,503.3 3,697.9 1,245.0 1,270.5
Min 46.9 56.1 59.6 81.5 84.7 85.9 77.4 84.3 59.7 69.3 70.4 70.6
Middle Fork American River—Above North Fork American River Confluence (866.868)
20% 758.8 862.5 1,247.1 2,030.0 2,446.8 2,879.7 2,375.7 2,256.6 1,464.4 1,033.2 999.8 847.5
50% 202.8 593.3 636.4 811.7 1,239.2 1,627.3 1,430.9 1,273.1 836.3 758.8 761.8 614.5
80% 108.9 208.9 228.8 307.8 475.3 675.1 524.7 370.1 452.2 495.0 502.6 257.5
Average 406.4 704.9 1,186.3 1,592.9 1,924.4 1,980.1 1,704.4 1,574.0 1,075.1 782.2 727.7 587.5
Max 3,121.3 16,198.7 37,036.2 66,484.9 48,809.5 24,099.4 20,257.0 24,101.3 4,613.1 3,785.0 1,267.3 1,285.4
Min 55.5 63.7 67.8 89.8 93.2 95.6 90.1 96.7 74.1 77.2 78.4 78.8