**DATE:** December 24, 2002 **STUDY NUMBER:** 03SN65-06

**Requested By:** Rick Pendergrass

**Due Date:** January 10, 2003

**Purpose of Study:** Provide information for the FY03 Safety Net Cost
Recovery Adjustment Clause considerations**.** This study is similar to
the 03SN65-05 study (intended to reflect operations in FY06) except
updating the juvenile bypass spill at Lower Monumental (reduce spill due
to RSW installation). [Changes from 03SN65-05 are highlighted in
grey]{.mark}.

> This is a continuous study of the system operation under the 2000 NMFS
> and USFWS Biological Opinions. There are no spring flow augmentation
> targets for Priest Rapids, McNary or Lower Granite. Refill of
> reservoirs by June 30 takes precedence in all water years.

**Directory of Study: AER Step:**

MODELA::DISK2:\[NPR.FISHOPS.OY00.03SN65_04.AER\]

LOGICAL: 00FSH\_:\[03SN65_04.AER\]

**OPER Step:**

[MODELA::DISK2:\[NPR.FISHOPS.OY00.03SN65_06. OPER\]]{.mark}

[LOGICAL: 00FSH\_:\[03SN65_06.OPER\]]{.mark}

#### Name of Regulator: Jennie Tran

**AER STEP**

-   This AER Step is used to determine the project minimum elevations
    (or maximum draft) using load equal to OY01 Firm Energy Load
    Carrying Capability (FELCC) and unlimited secondary market. Minimum
    elevations from the AER Step will be input into the Operational
    Step.

-   This is a **continuous** study based on the OY01 PNCA data
    submittal. The study will begin on Aug. 1, 1928 and end on July 31,
    1978, a 50-year study.

-   **Stream Flow:** The 50 years of Modified Stream flows used are from
    "Modified Streamflows 1990 Level of Irrigation", dated July 1993.
    They contain 1990 level irrigation depletion's. Adjustments to these
    1990 level modified stream flows are due to the Bureau of
    Reclamation's updated **Grand Coulee pumping schedule** for the
    Columbia Basin Project. This pumping schedule is included in the
    BOR's February 1, 2000 preliminary PNCA data submittal. No
    adjustments are made for **NTSA** storage and release. The inflows
    to Brownlee are adjusted by the BOR's regulation of the Upper Snake
    projects to release 427 kaf (see **Upper Snake**).

-   **Plant Data:** The OY01 plant data will be used with the following
    modifications: Packwood is a hydro independent plant in this study.

-   **Loads:** All FELCC is taken from the OY01 Critical Period study
    run by the Northwest Power Pool (NWPP). The NWPP study has a
    one-year critical period (August 16, 1936 through March 31, 1937).
    Thus, only one year of FELCC values are used for all water
    conditions. This study reflects coordination between PNCA parties in
    meeting PNCA FELCC. Therefore, generation from projects owned by
    non-PNCA parties (Brownlee, Oxbow, Hells Canyon, and Canadian
    projects) is not used to meet PNCA FELCC in these studies. August,
    May, June, and July FELCC comes from the PNCA Final Regulation,
    which includes flow augmentation target flows at McNary and Lower
    Granite. FELCC plus Hydro-Independent generation from 1936-37 is the
    system total generation. Then, the system total generation will be
    reduced by 50 years of hydro-independent generation
    (PS_HI:HI9706_60YR_COOR.HYMOD) to produce 50 years of FELCC. There
    will be an unlimited secondary market.

-   **Unit Outages:** The unit outages for non-federal projects were
    taken from the OY01 data submittal. For federal projects the unit
    outages were based on the actual outages from 1999-2001, and these
    outages were adjusted to exclude unusual outages.

-   **Initial Contents:** Storage reservoirs are initialized to full on
    1 August 1928, with the following exceptions. Mica is initialized to
    the July target of 5752.1 ksfd (3456.2+2295.9 ksfd). Grand Coulee is
    initialized to 1285.0 feet (2408.4 ksfd). Brownlee is initialized to
    2067.0 feet (422.4 ksfd). Libby is initialized to 2439 feet (2061.3
    ksfd). John Day is initialized to 262.5 feet (127.7 ksfd). Corra
    Linn is initialized to 1743.32 feet (285.4 ksfd). Hungry Horse is
    initialized to 3560 feet (1548.5 ksfd). Dworshak is initialized to
    1570.0 feet (753.0 ksfd). The lower Snake projects are initialized
    to their MOP elevations in July: Ice Harbor 437.0 feet (193.4 ksfd),
    Lower Monumental 537.0 feet (180.5 ksfd), Little Goose 633.0 feet
    (260.5 ksfd), and Lower Granite 733.0 feet (225.0 ksfd).

-   **CRC Rule Curves:** Critical Rule Curves (CRC) used are in
    accordance with PNCA 2001 adopted system critical rule curves. They
    are as follows: 1st year = OY01 CRC1; 2nd year = empty; 3rd year =
    empty; and 4th year = empty.

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-   **Flood Control Rule Curves:** Variable Flow (VARQ) flood control
    curves for Hungry Horse, Libby and Grand Coulee were provided by the
    Corps of Engineers to BPA on July 10, 2000. On July 14, 2000 Bureau
    of Reclamation provided the new flood control (for Hungry Horse
    only) to replace the data from the COE. The curves for Grand Coulee
    contained in the COE data set are adjusted for the amount of storage
    capability available below URC on April 30 each year for Mica, Arrow
    and Duncan to more closely reflect the methodology used in real-time
    operations.

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-   **ECC Curves:** VECC's are calculated using OY01 Power Discharge
    Requirements (PDR's), distribution factors and forecast errors which
    are used in PNCA planning. The ECC lower limit of 1225 feet (420.5
    ksfd) in January-April 15, 1280 feet (2216.4 ksfd) April 30-May,
    1290 feet in June-July at Coulee was used in calculating the VECC
    during periods in which the system is generating surplus energy. The
    Canadian AOP VECC's are based on historical volumes and the Arrow
    Total method. The VECCs for the Federal projects are based on the
    Kuehl-Moffitt volume forecast (Kuehl-Moffitt Report dated July
    1986).

    **Project Specific Data:**

-   **Mica, Duncan and Arrow** will be on their AOP02 operations
    including changes agreed to by the Entities as described in the
    DOP02. The Canadian Treaty projects are fixed to the 50-year DOP
    Treaty Storage Regulation run by BPA. Mica data logic in the
    Hydrosim program is turned off. Mica's minimum storage content is
    reset to 0.0 ksfd so that drafting below 2295.9 ksfd (normal minimum
    content) can occur.

-   **Libby** is operated to the draft limits of 2432.5 ft (1923.8
    ksfd), 2425.5 ft (1781.8 ksfd), 2418.6 ft (1644.8 ksfd), and 2411.0
    ft (1502.4 ksfd) in September through December to meet December URC
    of 2411.0 feet. In January through mid-April, Libby is operated on
    minimum flow or VARQ flood control objectives as defined in the
    BiOP. It should be noted that Libby does violate URC for Corra
    Linn's IJC operation. Sturgeon flow requirements are as follows:

    Libby is operated during May-July for Sturgeon./Bull trout in all
    years. The project draft limit for contributing to the McNary salmon
    flow augmentation target is 2439 ft (2061.3 ksfd) in August. Libby's
    maximum outflow from mid-April through August is powerhouse
    hydraulic capacity without spill unless a higher outflow is required
    to maintain the required VARQ flood control space. White Sturgeon
    Flow Objective at Bonners Ferry, kcfs

  ------ --------- ---------- ----------- ----------- ----------- ---------
                                                                  

                                                                  

                                                                  

                                                                  
  ------ --------- ---------- ----------- ----------- ----------- ---------

-   **Hungry Horse** is operated in proportional draft mode September
    through December subject to draft limits of 3560 (1548.5 ksfd),
    3555.7 (1496.8 ksfd), 3544 (1358.7 ksfd) and 3533 feet (1235.4
    ksfd), respectively. In October through December it will not be
    operated above 3555.7 feet (1496.8 ksfd) to protect against winter
    floods. The reservoir storage-elevation relationship will reflect 3%
    bank storage. From January through March, Hungry Horse operates to
    the higher of IRC of 3520 ft (1098.4 ksfd) or Biological Rule Curve
    objectives but below a maximum content calculated to reduce the
    possibility of forced spill. The Biological rule curves are
    calculated using assumed inflows which are exceeded 75 percent of
    the time, perfect foreknowledge of the minimum outflow, and the
    requirement to be at flood control elevation on April 10. In April
    through June, Hungry Horse operates on or near flood control. On
    July 31, August 15 and August 31, Hungry Horse draft limit is 3560,
    3550 and 3540.0 feet (1548.5, 1428.3 and 1313.2 ksfd) for McNary and
    Priest Rapids flow augmentation. Hungry Horse will be operated to
    support the Columbia Falls minimum flow of 3,500 cfs year round and
    maximum flow of 4,500 cfs October 15 through December 15. Hungry
    Horse maximum outflow from mid-April through August is powerhouse
    hydraulic capacity of 12,000 cfs and no spill is allowed unless
    required to maintain the required flood control space. Hungry Horse
    will violate upper rule curve to keep its maximum outflow to 20 kcfs
    or below. During the flow augmentation period, Hungry Horse will
    release no more water than necessary to meet the minimum flow
    requirements. Maximum out flow at Horse is 6800 cfs from June
    through Labor Day except to contribute flow targets at Priest and
    McNary.

-   **Albeni Falls** is operated in September -- October to 2060.0 feet
    (465.7 ksfd) and 2056 feet (279.0 ksfd). In November - March, Albeni
    Falls is operated to 2055.0 feet (234.7 ksfd). In April 15, April
    30, and May, Albeni Falls is operated to 2055.5 feet (256.9 ksfd),
    2056 feet (279.0 ksfd), and 2057.0 feet (325.7 ksfd), respectively.
    In June through August, Albeni Falls is operated to full 2062.5 feet
    (582.4 ksfd) \[per Dana Reedy 11/8/99, NWPP\].

-   **Grand Coulee** is operated to meet FELCC September through
    December subject to the draft limits of 1283 feet (2329.7 ksfd),
    1280 feet (2216.4 ksfd), 1275 feet (2027.7 ksfd), and 1265 feet
    (1665.4 ksfd). In January through March, Coulee is operated to the
    higher of winter draft limits \[1260 feet (1491.5 ksfd), 1250 feet
    (1159.1 ksfd), 1240 feet (843.9 ksfd), respectively\] or the minimum
    storage values calculated. The Biological Rule Curve reflects the
    expected April 10th URC and storage needed for the appropriate
    Vernita Bar minimum flow requirement. Grand Coulee is then operated
    above these minimum storage points. On April 15, Coulee is operated
    on flood control. From April 30 through May, Grand Coulee may be
    drafted to the lower of flood control or 1280 feet to support Priest
    Rapids and McNary flow augmentation targets. In June - August, Grand
    Coulee draft limits are 1290 ft (2614.3 ksfd), 1285 feet (2408.2
    ksfd), 1280 feet (2216.4 ksfd), and 1280 feet (2216.4 ksfd)
    respectively to support Priest Rapids and McNary flow augmentation
    targets. At-site minimum flow is equal to 30,000 cfs. Grand Coulee
    is subject to a draw down limit of 1.5 feet per day when Coulee is
    above 1260 feet, 1.3 feet per day when Coulee between 1260 and 1240
    feet, and 1.0 feet per day when Coulee is below 1240 feet. During
    the flow augmentation period, Grand Coulee will release no more
    water than necessary to meet the minimum flow requirements.

-   **Vernita Bar** minimum flows for December through May vary by water
    condition, with minimum flows established as the lesser of a) 68% of
    the largest of the October or November flow at Wanapum or b) 70,000
    cfs. Values less than 70,000 cfs are rounded to the nearest
    5,000-cfs. The minimum protection level flow at Vernita Bar will be
    50,000 cfs.

-   **Priest Rapids**: From April 10 to June 30 Priest Rapids has a flow
    augmentation target of 135000 cfs for Steelhead. The April 1 to
    April 9 the minimum flow for Priest Rapids is the same as the
    Vernita Bar minimum for each year.

-   The **Upper Snake** reservoir operations adjustments to Brownlee
    inflows came from the BOR in May 1997. The operation tries to
    release 427 kaf in as many years as possible over the 50-year record
    during the May through August period.

-   **Brownlee** will be on flood control from February through April.
    In May, the reservoir is operated to 2069 feet (436.3 ksfd). In June
    Brownlee is filled if necessary and maintained at elevation 2077
    feet (491.7 ksfd). In July, August 1 and August 2, the reservoir is
    drafted to 2050 feet (320.4 ksfd), 2050 feet (320.4 ksfd) and 2045
    feet (293.8 ksfd), respectively for flow augmentation that includes
    both IPCO contribution and shaping of Upper Snake water by the end
    of August. In September and October, the reservoir operates to 2045
    feet and 2035 feet (242.0 ksfd), respectively in anticipation of
    providing a maximum discharge of 9,000 cfs from mid-October through
    November. Outflows up to 20,000 cfs are allowed in October (the
    average of 30,000 cfs in the first half and 9,000 cfs to 13,000 cfs
    in the second half of the month). No higher than 9,000 cfs is
    allowed in November. At the end of December and January, the
    reservoir is operated at 2070 feet (443.2 ksfd) and 2060 feet (379.5
    ksfd), respectively.

-   **Dworshak** is on minimum flow of 1300 cfs all periods or flood
    control objectives as defined in the BiOP, with the exception of
    April through August when it operates to meet Lower Granite flow
    augmentation targets. On April 15- August 31 Dworshak may draft to
    elevation 1520 feet (395.8 ksfd) to support Lower Granite flow
    augmentation targets. Note: Dworshak's outflow is limited to 14,000
    cfs during the flow augmentation period (April 3 through August 31)
    and is limited to 25,000 cfs in all other periods for downstream
    flood control. During the flow augmentation period, Dworshak will
    release no more water than necessary to meet the minimum flow
    requirements.

-   The four lower Snake River projects (Lower Granite, Little Goose,
    Lower Monumental and Ice Harbor) and the four lower Columbia River
    projects (McNary, John Day, The Dalles and Bonneville) each are
    required to operate their turbines within **1% of peak efficiency**
    during the period of March through November. This requirement is
    reflected in a hydro availability file, which limits the maximum
    generation capability of each project in each of the fourteen
    periods. No other hydro outages assumed.

-   Generation at these eight projects (Lower Granite, Little Goose,
    Lower Monumental, Ice Harbor, McNary, John Day, The Dalles and
    Bonneville) is reduced further with the inclusion of **Juvenile
    Bypass 2004 expected Fish Spill Plan**. Juvenile Bypass Fish Spill
    at Federal projects (values less than one are percent of outflow and
    values greater than one are cfs), limited by Spill Caps, is as shown
    below. The spill caps represent completed modifications at spillways
    currently planned and which are used as hydroregulation modeling
    caps, not instantaneous. Lower Granite, Little Goose, Lower
    Monumental, Ice Harbor, McNary, John Day, The Dalles and Bonneville
    have a minimum turbine flow of 12000, 12000, 12000, 5500, 50000,
    50000, 50000, and 30000-cfs respectively.

-   **Juvenile Bypass Spill and Dissolved Gas Caps:**

> There will be no Juvenile Bypass Spill requirement at Lower Granite,
> Little Goose, and Little Monumental if the regulated flow at Lower
> Granite is less than 85,000 cfs.

![](media/image2.wmf){width="5.99375in" height="1.7527777777777778in"}

[]{.mark}

> Lower Granite, Little Goose, and Lower Monumental will spill the
> amounts listed above, when the April through July volume forecast is
> greater than or equal to 17.5 MAF. Once spill has started, it will
> continue through June 20 even though subsequent forecasts may drop
> below 17.5 MAF. Ice Harbor attempts to spill at the amounts listed
> above in all years.

-   **Lower Columbia fall spawning** flow objectives (at Bonneville) are
    as follows: From November 1 through December 31 provide 125 kcfs.
    The priority for releasing water from upstream reservoirs for this
    flow augmentation is Grand Coulee, Libby, and Hungry Horse. The
    draft limits for Chum flow in Nov-Dec are: 3555.7 feet (1497.0
    ksfd), and 3549.2 ft (1418.7 ksfd) respectively at Hungry Horse;
    1275 ft (2027.7 ksfd) and 1265 feet ( 1665.4 ksfd) respectively at
    Coulee; 2418.6 ft (1644.8 ksfd), and 2411.0 ft (1502.4 ksfd)
    respectively at Libby.

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-   Use a **sliding scale flow augmentation target** of from 220,000 to
    260,000-cfs **at McNary** based on The Dalles April 1, January
    through July volume runoff. A straight-line interpolation will be
    used for flow targets for volume forecasts between 85 and 105 Maf in
    the April 20 through June period. AP2 values are prorated at 4 days
    at 155,000 cfs and 11 days at from 220,000 to 260,000 cfs. Maximum
    and minimum targets are 260,000 cfs and 220,000 cfs, respectively.
    July and both halves of August flow targets are 200,000 cfs. The
    priority for releasing water from upstream reservoirs for flow
    augmentation is Grand Coulee, Libby and Hungry Horse.

-   **Lower Granite** also has **sliding scale flow augmentation
    targets**. When the April 1 Lower Granite April through July runoff
    forecast is less than 16 Maf, then the April 3 through June 20 flow
    target is 85,000 cfs and the June 21 through August flow target is
    50,000 cfs. When the April 1 Lower Granite April through July
    forecast is greater than 20 Maf, then the April 3 through June 20
    target flow is 100,000 cfs. When the April 1 Lower Granite April
    through July forecast is greater than 28 Maf, then the June 21
    through August target flow is 55,000 cfs. The spring flow targets
    are interpolated for forecasts between 16 and 20 Maf and the summer
    flow targets are interpolated for forecasts between 16 and 28 Maf.

-   **John Day** is operated at 262.5 feet (127.8 ksfd) from mid-April
    through September. From October through mid-April, John Day operates
    to elevation 265 feet (191.0 ksfd).

-   Lower Snake projects will be **operated at MOP** in accordance with
    the COE data submittal and the 1995 BiOp. As identified in the BiOp,
    the Corps will operate Little Goose, Lower Monumental, and Ice
    Harbor within one foot of minimum operating pool (MOP) during the
    period from approximately April 3 through August 31. Lower Granite
    will operate within one foot of MOP from approximately April 3
    through November 15. MOP for Lower Granite, Little Goose, Lower
    Monumental and Ice Harbor is elevation 733 (225.0 ksfd), 633 (260.5
    ksfd), 537 (180.5 ksfd) and 437 feet (193.4 ksfd), respectively.
    During the rest of the year Lower Granite, Little Goose, Lower
    Monumental and Ice Harbor will operate at elevation 738 (245.8
    ksfd), 638 (285.1 ksfd), 540 (190.1 ksfd) and 440 feet (204.8 ksfd),
    respectively.

-   Juvenile **Bypass spills at non-Federal** projects will be as
    described below and as was submitted for OY01 PNCA planning.

    PROJECT SPILL FOR FISH IN

    PERCENT OF REGULATED FLOW (%)

+------------+------+------+------+------+------+------+------+-------+
| PROJECTS:  | Apr1 | Apr2 | May  | Jun  | Jul  | Aug1 | Aug2 |       |
+------------+------+------+------+------+------+------+------+-------+
| **Wells**  | 0.0  | 6.5  | 6.5  | 0.0  | 6.5  | 2.5  | 0.0  |       |
+------------+------+------+------+------+------+------+------+-------+
| ### R      | 0.0  | 12.0 | 15.0 | 4.4  | 8.0  | 4.0  | 0.0  |       |
| ocky Reach |      |      |      |      |      |      |      |       |
+------------+------+------+------+------+------+------+------+-------+
| **Rock     | 4    | 19   | 23   | 23   | 23   | 19   | 4    |       |
| Island     | ,800 | ,300 | ,000 | ,000 | ,000 | ,300 | ,800 |       |
| (cfs)**    |      |      |      |      |      |      |      |       |
+------------+------+------+------+------+------+------+------+-------+
| *          | 0.0  | 50.0 | 50.0 | 42.5 | 35.0 | 35.0 | 35.0 |       |
| *Wanapum** |      |      |      |      |      |      |      |       |
+------------+------+------+------+------+------+------+------+-------+
| **Priest   | 0.0  | 75.0 | 75.0 | 60.0 | 45.0 | 45.0 | 45.0 |       |
| Rapids**   |      |      |      |      |      |      |      |       |
+------------+------+------+------+------+------+------+------+-------+

-   **Kootenay Lake** shall be operated as necessary, up to free flow,
    to maintain the lake level below the IJC rule curve and the
    calculated "allowable elevation at Queens Bay". This is implemented
    using the 5 step method as developed by BPA and the Corps. After
    August 31, the lake level may be raised to elevation 1745.32 at the
    Queens Bay gage. This maximum elevation at Queens Bay is in effect
    through January 7. After January 7 the lake will be lowered to
    elevation 1744 on February 1, elevation 1742.4 on March 1, and
    1739.32 on April 1. April through August 31, after the lake exceeds
    elevation 1739.32 feet at the Queens Bay gage, the lake shall be
    operated using the "allowable elevation" calculation to determine
    the Queens Bay maximum allowable elevation until the elevation at
    the Nelson gage drafts back to elevation 1743.32 feet.

**OPER STEP**

-   All AER step criteria apply unless specifically amended below.

-   **Loads:** The system is run to 2000 Coordinated system firm loads
    from BPA's White Book. A secondary market of 9,000 aMW is used in
    every period, every year.

-   **Initial Contents: Brownlee** is initialized to 2050.0 ft (320.4
    ksfd) on August 1, 1928.

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-   **Non-federal** projects are run to the contents that resulted in
    the AER step.

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-   **Lower Columbia fall spawning** flow objectives (at Bonneville) are
    as follows: From November 1 through December 31 provide 125 kcfs
    Grand Coulee, Libby, and Hungry Horse will release water (in that
    order) to meet the Lower Columbia fall spawning salmon flow
    objectives at Bonneville in November and December. Each reservoir
    has been assigned a lower draft limit only in November and December
    so that each will draft no lower than the draft limit before the
    next priority reservoir is used. The January-April 15 operation of
    the three reservoirs is to achieve the Biop April 10 URC objectives.
    Hungry Horse, Grand Coulee, and Dworshak will be on minimum flow
    from April through June 30 in all water years (No spring flow
    targets required at Priest Rapid, Lower Granite, and McNary
    projects). This operation is intended to **maximize storage in**
    **the federal projects by June 30 to maximize the water available
    for summer flow augmentation**. These projects will release above
    minimum outflow only as needed to meet flood control requirements.
    Grand Coulee will draft below flood control if required to meet the
    Vernita Bar flow requirement.

**Project Specific Data:**

-   **Mica, Duncan and Arrow** will be on their AOP02 operations
    including changes agreed to by the Entities as described in the
    DOP02. The Canadian Treaty projects are fixed to the 50-year DOP
    Treaty Storage Regulation run by BPA. Mica data logic in the
    Hydrosim program is turned off. Mica's minimum storage content is
    reset to 0.0 ksfd so that drafting below 2295.9 ksfd (normal minimum
    content) can occur.

-   **Libby:** same as AER step.

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-   **Hungry Horse is operated in September through December at 3560.0
    feet (1548.5 ksfd), 3555.7 feet (1497.0 ksfd), 3555.7 feet (1497.0
    ksfd), and 3549.2 ft (1418.7 ksfd) respectively, which are the VARQ
    flood control points. From January through March, Hungry Horse
    operates above its Biological Rule Curve objectives and below a
    maximum content calculated to reduce the possibility of forced
    spill. The Biological rule curves are calculated using assumed
    inflows that are exceeded 75 percent of the time, perfect
    foreknowledge of the minimum outflow, and the requirement to be at
    VARQ flood control elevation on April 10. On July 31, August 15 and
    August 31, Hungry Horse draft limits are 3550, 3542 and 3540 feet
    (1428.3, 1341.7, and 1313.2 ksfd) for McNary flow augmentation. When
    the July 1 April-August volume forecast at The Dalles is less than
    80 MAF, the July flow augmentation draft limit is 3545 feet (1370.1
    ksfd). Hungry Horse is operated to support a Columbia Falls minimum
    flow of 3,500 cfs in September through December as well as a minimum
    project outflow of 900 cfs. From January through August, the minimum
    flows at the project and at Columbia Falls are variable based on
    each month's Hungry Horse April-August forecast. The minimum flows
    are established using a straight-line interpolation between 400 and
    900 cfs for the project and 3,200 and 3,500 cfs at Columbia Falls
    for volume forecasts between 1190 kAF and 1790 kAf[.]{.mark}**

  ------ --------- ---------- ----------- ----------- ----------- ---------
                                                                  

                                                                  

                                                                  

                                                                  
  ------ --------- ---------- ----------- ----------- ----------- ---------

**Albeni Falls** is operated to 2051 feet (57.6 ksfd) during October
through April.

-   **Grand Coulee's** operation during the September through December
    period is subject to draft limits of 1280, 1280, 1275 and 1265 feet
    (2216.4 ksfd, 2216.4 ksfd, 2027.7 ksfd, and 1665.4 ksfd)
    respectively. From January through March, Grand Coulee operates
    above its Biological Rule Curve. The Biological rule curves are
    calculated using assumed inflows that are exceeded 85 percent of the
    time, perfect foreknowledge of the minimum outflow, and the
    requirement to be at VARQ flood control elevation on April 10. When
    the July 1 April-August volume runoff at The Dalles is greater than
    92 MAF, Grand Coulee is operated as low as 1285.0, 1280.0, and
    1280.0 feet (2408.3, 2216.4, and 2216.4 ksfd) in July through
    August, respectively, to meet the McNary flow augmentation targets.
    When the July 1 April-August volume runoff at The Dalles is 92 MAF
    or less, Grand Coulee is operated as low as 1285.0, 1278.0 and
    1278.0 feet (2408.3, 2140.9 and 2140.9 ksfd) in July through August,
    respectively, to meet the McNary flow augmentation targets. At-site
    minimum flow is 50,000 cfs for peaking purposes.

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-   **Columbia Basin Irrigation Project Pumping (Banks Lake)** will be
    reduced by the equivalent of 5 feet (65.5 ksfd) in August in years
    when it is needed to meet the McNary flow augmentation target of 200
    kcfs. Additional water is pumped in the following January-April
    period to return the Banks Lake elevation to its original level.

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-   In July through August, **Dworshak** may draft to elevation 1524,
    1522 and 1520 feet (422.6, 409.2, and 395.8 ksfd) to support Lower
    Granite flow augmentation targets.

-   **Lower Granite** has a **sliding scale flow augmentation target**
    for the summer. When the June 1 Lower Granite April through July
    runoff forecast is less than 16 Maf, the June 21 through August flow
    target is 50,000 cfs. When the June 1 Lower Granite April through
    July forecast is greater than 28 Maf, the June 21 through August
    target flow is 55,000 cfs. The summer flow targets are interpolated
    for forecasts between 16 and 28 Maf.

-   **[Juvenile Bypass Spill and Dissolved Gas Caps (reduced spill at
    LMN due to RSW installation)]{.mark}**

[]{.mark}

![](media/image3.wmf)

LWG, LGS and LMN spill the amounts listed above when the LWG Apr-Jul
volume forecast is greater than or equal to 17.5 MAF. A test of
summer-time spill is in effect. Spill begins on April 3 and ends on
August 31 at LWG, LGS and LMN in those years.

> **LWG** spill is 18 kcfs through RSW, 24 hrs/day, April 3 -- August
> 31;
>
> **LGS** spill is at 120% TDG, 12 hrs/day, April 3 -- August 31;
>
> **LMN** spill is 18 kcfs through RSW, 24 hrs/day, April 3 -- August
> 31;
>
> **IHR** spill is 18 kcfs through RSW, 24 hrs/day, April 3 -- August
> 31;
>
> **MCN** spill is at 120% TDG, 12 hrs/day, April 10 -- June 30;
>
> **JDA** spill test of 60% vs. 30% of flow, alternating days, 12
> hrs/day, April 10 -- August 31;
>
> **TDA** spill is at 40% of flow, 24 hrs/day, April 10 -- August 31;
>
> **BON** spill test of 120% TDG 24 hrs/day vs. 120% TDG for 12 hrs/day
> and 75 kcfs 12 hrs/day, alternating days, April 10 -- August 31.