Number of days required in Month X = Total number of days in Month * * (1 - 1/(1 + eK)
where
K = A + (B*natural logarithm of the previous month's 8-River Index);
A and B are determined by reference to Table 1 for the Roe Island and Chipps Island locations;
x is the calendar month in the February 1 to June 30 period;
and e is the base of the natural (or Napierian) logarithm.
Where the number of days computed in this equation in paragraph (a)(1)(i)(A) of this section shall be rounded to the nearest whole number of days. When the previous month's 8-River Index is less than 500,000 acre-feet, the number of days required for the current month shall be zero.
Table 1. Constants applicable to each of the monthly equations to determine monthly requirements described.
Month X | Chipps Island | Roe Island (if triggered) | ||
A | B | A | B | |
Feb | -1 | -1 | -14.36 | + 2.068 |
Mar | -105.16 | + 15.943 | -20.79 | + 2.741 |
Apr | -47.17 | + 6.441 | -28.73 | + 3.783 |
May | -94.93 | + 13.662 | -54.22 | + 6.571 |
June | -81.00 | + 9.961 | -92.584 | + 10.699 |
1 Coefficients for A and B are not provided at Chipps Island for February, because the 2640 micromhos/cm specific conductance criteria must be maintained at Chipps Island throughout February under all historical 8-River Index values for January.
At temperatures less than below 61 °F: SRFMC = 1.35
At temperatures between 61 °F and 72 °F: SRFMC = 6.96-.092 * Fahrenheit temperature
At temperatures greater than 72 °F: SRFMC = 0.34
where SRFMC is the Sacramento River Fish Migration criteria value. Temperature shall be the water temperature at release of tagged salmon smolts into the Sacramento River at Miller Park.
For years in which the SJVIndex is [GREATER THAN]2.5: SJFMC = (-0.012) + 0.184*SJVIndex
In other years: SJFMC = 0.205 + 0.0975*SJVIndex
where SJFMC is the San Joaquin River Fish Migration criteria value, and SJVIndex is the San Joaquin Valley Index in million acre feet (MAF)
SSI = R ÷ MT(0.007692)
where
R = number of recaptures of tagged fish
M = number of marked (tagged) fish released
T = proportion of time sampled vs total time tagged fish were passing the site (i.e. time between first and last tagged fish recovery)
Where the value 0.007692 is the proportion of the channel width fished by the trawl, and is calculated as trawl width/channel width.
OSI = R1/M1÷ R2/M2
where
R1 = number of tagged adults recovered from the upstream release
M1 = number released upstream
R2 = number of tagged adults recovered from the Port Chicago release
M2 = number released at Port Chicago
SSI = R ÷ MT(0.007692)
where
R = number of recaptures of tagged fish
M = number of marked (tagged) fish released
T = proportion of time sampled vs total time tagged fish were passing the site (i.e. time between first and last tagged fish recovery)
Where the value 0.007692 is the proportion of the channel width fished by the trawl, and is calculated as trawl width/channel width.
OSI = R1/M1÷ R2/M2
where
R1 = number of tagged adults recovered from the upstream release
M1 = number released upstream
R2 = number of tagged adults recovered from the Port Chicago release
M2 = number released at Port Chicago
Location | Sampling site Nos (I--A/RKI) | Parameter | Description | Index type | San Joaquin Valley Index | Dates | Values |
San Joaquin River at Jersey Point, San Andreas Landing, Prisoners Point, Buckley Cove, Rough and Ready Island, Brandt Bridge, Mossdale, and Vernalis | D15/RSAN018, C4/RSAN032, D29/RSAN038, P8/RSAN056, -/RSAN062, C6/RSAN073, C7/RSAN087, C10/RSAN112 | Specific Conductance @ 25 °C | 14-day running average of mean daily for the period not more than value shown, in mmhos | Not Applicable | [GREATER THAN]2.5 MAF | April 1 to May 31 | 0.44 micro-mhos. |
San Joaquin River at Jersey Point, San Andreas Landing and Prisoners Point | D15/RSAN018, C4/RSAN032, D29/RSAN038 | Specific Conductance | 14-day running average of mean daily for the period not more than value shown, in mmhos | Not Applicable | [LESS THAN EQUAL TO]2.5 MAF | April 1 to May 31 | 0.44 micro-mhos. |
ISJ = 0.6X + 0.2Y and 0.2Z
where
ISJ = San Joaquin Valley Index
X = Current year's April-July San Joaquin Valley unimpaired runoff
Y = Current year's October-March San Joaquin Valley unimpaired runoff
Z = Previous year's index in MAF, not to exceed 0.9 MAF
40 C.F.R. §131.37