Engineer’s Work Product

Frequency curve comparison plots

Figure 1 through Figure 17 compares the Comp Study and CVHS frequency

curves for 3-day flows at various locations in the Sacramento and San

Joaquin river basins.

Figure 1. Frequency curves for 3-day flows at analysis point AMR-14,

American River at Fair Oaks

Figure 2. Frequency curves for 3-day flows at analysis point BRR-9, Bear

River near Wheatland

Engineer’s Work Product

Figure 3. Frequency curves for 3-day flows at analysis point DRC-7, Deer

Creek near Vina

Figure 4. Frequency curves for 3-day flows at analysis point FTH-ORO,

Feather River at Oroville Dam

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Figure 5. Frequency curves for 3-day flows at analysis point SAC-184,

Sacramento River at Ord Ferry

Figure 6. Frequency curves for 3-day flows at analysis point SAC-260,

Sacramento River at Bend Bridge

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Figure 7. Frequency curves for 3-day flows at analysis point SAC-59,

Sacramento River at Sacramento

Figure 8. Frequency curves for 3-day flows at analysis point SAC-79,

Sacramento River at Verona

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Figure 9. Frequency curves for 3-day flows at analysis point YUB-7, Yuba

River near Marysville

Figure 10. Frequency curves for 3-day flows at analysis point CCR-30,

Chowchilla River at Buchanan Dam

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Figure 11. Frequency curves for 3-day flows at analysis point FRS-21, Fresno

River at Hidden Dam

Figure 12. Frequency curves for 3-day flows at analysis point KNG-65, King

River at Pine Flat Dam

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Figure 13. Frequency curves for 3-day flows at analysis point OWN-31, Owens

Creek at Owens Dam

Figure 14. Frequency curves for 3-day flows at analysis point SJR-118, San

Joaquin River near Newman

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Figure 15. Frequency curves for 3-day flows at analysis point SJR-171, San

Joaquin River at El Nido

Figure 16. Frequency curves for 3-day flows at analysis point SJR-266, San

Joaquin River at Friant Dam

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Figure 17. Frequency curves for 3-day flows at analysis point SJR-72, San

Joaquin River at Vernalis

10

Table 1. Comparison of unregulated flows at various probabilities for the analysis points in the Sacramento River basin

ID

(1)

Analysis

point

(2)

Probability

(AEP1)

(3)

Comp Study CVHS Difference2 (%)

1-day

(4)

3-day

(5)

7-day

(6)

1-day

(7)

3-day

(8)

7-day

(9)

1-day

(10)

3-day

(11)

7-day

(12)

1

AMR-14

0.002 441,345 309,890 172,028 461,988 331,557 187,489 4% 7% 8%

0.005 336,296 237,631 136,566 347,340 248,538 144,708 3% 4% 6%

0.01 268,137 190,472 112,433 274,257 195,934 116,697 2% 3% 4%

0.02 208,874 149,241 90,538 211,670 151,096 92,114 1% 1% 2%

2

BRR-9

0.002 54,443 33,709 20,355 51,851 32,225 20,439 -5% -5% 0%

0.005 47,955 29,881 18,147 45,860 28,636 18,145 -5% -4% 0%

0.01 42,718 26,772 16,344 40,987 25,703 16,280 -4% -4% 0%

0.02 37,202 23,477 14,422 35,819 22,578 14,299 -4% -4% -1%

3

DRC-7

0.002 24,657 18,767 12,006 25,480 18,241 11,806 3% -3% -2%

0.005 20,468 15,517 9,989 21,122 15,103 9,785 3% -3% -2%

0.01 17,498 13,220 8,556 18,039 12,880 8,357 3% -3% -2%

0.02 14,693 11,060 7,200 15,134 10,785 7,012 3% -3% -3%

4

FTH-ORO

0.002 350,652 290,134 202,062 339,447 285,069 186,548 -3% -2% -8%

0.005 302,843 247,912 171,400 290,358 239,754 157,921 -4% -3% -9%

0.01 265,843 215,815 148,492 253,093 206,343 136,655 -5% -5% -9%

0.02 228,262 183,730 125,920 215,869 173,804 115,799 -6% -6% -9%

5 SAC-184

0.002 657,299 559,452 376,238 529,995 409,635 305,450 -24% -37% -23%

0.005 540,515 460,053 315,471 470,787 367,930 275,669 -15% -25% -14%

0.01 459,943 391,475 272,406 425,029 335,038 251,816 -8% -17% -8%

0.02 385,570 328,174 231,699 378,301 300,839 226,688 -2% -9% -2%

Engineer’s Work Product

11

ID

(1)

Analysis

point

(2)

Probability

(AEP1)

(3)

Comp Study CVHS Difference2 (%)

1-day

(4)

3-day

(5)

7-day

(6)

1-day

(7)

3-day

(8)

7-day

(9)

1-day

(10)

3-day

(11)

7-day

(12)

6

SAC-260

0.002 431,787 338,701 239,850 395,719 300,477 233,571 -9% -13% -3%

0.005 374,821 293,343 210,392 347,653 267,974 204,777 -8% -9% -3%

0.01 332,709 259,883 188,150 311,310 242,586 183,226 -7% -7% -3%

0.02 291,348 227,087 165,900 274,901 216,422 161,817 -6% -5% -3%

7 SAC-59

0.002 1,274,966 1,107,830 894,227 1,374,391 1,094,290 811,823 7% -1% -10%

0.005 1,023,204 894,037 725,686 1,152,648 944,469 706,902 11% 5% -3%

0.01 853,349 749,059 610,808 992,655 831,294 626,875 14% 10% 3%

0.02 699,818 617,383 505,970 839,374 718,399 546,306 17% 14% 7%

8 SAC-79

0.002 943,391 828,981 717,042 1,004,541 876,841 642,407 6% 5% -12%

0.005 766,651 676,965 585,554 865,182 755,325 564,500 11% 10% -4%

0.01 646,030 572,753 495,414 760,834 665,224 504,484 15% 14% 2%

0.02 535,818 477,135 412,707 657,472 576,637 443,482 19% 17% 7%

9 YUB-7

0.002 282,915 213,916 117,590 322,539 212,213 122,603 12% -1% 4%

0.005 229,049 172,743 98,212 256,597 172,736 101,973 11% 0% 4%

0.01 191,302 143,959 84,054 211,494 144,902 87,041 10% 1% 3%

0.02 156,179 117,238 70,379 170,407 118,855 72,729 8% 1% 3%

1. AEP = annual exceedence probability.

2. Percent difference = (CVHS – Comp Study)/CVHS * 100.

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Table 2. Comparison of unregulated flows at various probabilities for the analysis points in the San Joaquin River basin

ID

(1)

Analysis

point

(2)

Probability

(AEP1)

(3)

Comp Study CVHS Difference2 (%)

1-day

(4)

3-day

(5)

7-day

(6)

1-day

(7)

3-day

(8)

7-day

(9)

1-day

(10)

3-day

(11)

7-day

(12)

1 CCR-30

0.002 21,441 14,752 8,687 22,243 14,134 9,684 4% -4% 10%

0.005 18,419 12,395 7,337 18,828 11,860 7,992 2% -5% 8%

0.01 15,987 10,577 6,290 16,223 10,152 6,752 1% -4% 7%

0.02 13,452 8,750 5,233 13,619 8,467 5,555 1% -3% 6%

2 FRS-21

0.002 31,035 18,532 10,838 20,612 12,391 8,278 -51% -50% -31%

0.005 23,202 14,034 8,322 16,838 10,159 6,707 -38% -38% -24%

0.01 18,106 11,072 6,644 14,068 8,522 5,579 -29% -30% -19%

0.02 13,693 8,478 5,155 11,403 6,944 4,512 -20% -22% -14%

3 KNG-65

0.002 153,780 83,159 41,968 158,261 96,984 49,264 3% 14% 15%

0.005 108,567 60,430 31,727 115,321 70,948 37,205 6% 15% 15%

0.01 81,662 46,541 25,238 88,771 54,855 29,536 8% 15% 15%

0.02 59,978 35,069 19,695 66,663 41,444 22,972 10% 15% 14%

4 OWN-31

0.002 3,523 1,788 813 2,013 1,111 688 -75% -61% -18%

0.005 2,851 1,459 671 1,703 923 564 -67% -58% -19%

0.01 2,352 1,211 563 1,464 783 474 -61% -55% -19%

0.02 1,868 970 457 1,222 645 387 -53% -50% -18%

5 SJR-118

0.002 178,789 162,002 137,539 191,525 171,278 133,109 7% 5% -3%

0.005 138,560 125,982 107,450 155,666 138,335 107,226 11% 9% 0%

0.01 111,786 101,934 87,275 130,161 115,165 89,194 14% 11% 2%

0.02 88,008 80,510 69,229 106,161 93,563 72,506 17% 14% 5%

Engineer’s Work Product

ID

(1)

Analysis

point

(2)

Probability

(AEP1)

(3)

Comp Study CVHS Difference2 (%)

1-day

(4)

3-day

(5)

7-day

(6)

1-day

(7)

3-day

(8)

7-day

(9)

1-day

(10)

3-day

(11)

7-day

(12)

6 SJR-171

0.002 113,896 107,270 89,412 112,880 102,693 77,144 -1% -4% -16%

0.005 86,951 82,101 68,955 90,995 81,811 61,372 4% 0% -12%

0.01 69,438 65,704 55,534 75,792 67,539 50,663 8% 3% -10%

0.02 54,186 51,391 43,741 61,746 54,541 40,956 12% 6% -7%

7 SJR-266

0.002 179,432 115,320 59,967 141,861 98,369 52,471 -26% -17% -14%

0.005 127,064 82,411 44,278 104,188 72,057 39,607 -22% -14% -12%

0.01 95,813 62,608 34,550 80,907 55,872 31,467 -18% -12% -10%

0.02 70,561 46,482 26,405 61,487 42,419 24,523 -15% -10% -8%

8 SJR-72

0.002 412,740 362,988 247,002 266,091 247,024 220,551 -55% -47% -12%

0.005 310,343 273,799 192,745 217,747 201,686 178,727 -43% -36% -8%

0.01 244,715 216,470 156,404 183,450 169,627 149,463 -33% -28% -5%

0.02 188,312 167,063 123,931 151,175 139,545 122,255 -25% -20% -1%

1. AEP = annual exceedence probability.

2. Percent difference = (CVHS – Comp Study)/CVHS * 100