REPORT OF CHIEF ENGINEER HUDSON RIVER - BLACK RIVER ... ... HUDSON RIVER - BLACK RIVER REGULATING DISTRICT

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    REPORT OF CHIEF ENGINEER HUDSON RIVER - BLACK RIVER REGULATING DISTRICT

    BOARD MEETING APRIL 10, 2020 – MAYFIELD, NEW YORK

    HUDSON RIVER AREA - MARCH SUMMARY

    Reservoir Operation

    Great Sacandaga Lake

    The March average daily release from the Sacandaga Reservoir (Great Sacandaga Lake) was approximately 2,390 cubic feet per second (cfs). The Upper Hudson / Sacandaga River Offer of Settlement target elevation for March 31 is 748.12 feet (ft.). The release of water from Great Sacandaga Lake was consistent with the Upper Hudson/Sacandaga River Offer of Settlement. Table 1.0 - Great Sacandaga Lake Elevation and Release

    Date Daily Average Elevation

    Deviation (ft) (1) Release (cfs)

    (ft,NAVD)(4) From Average

    From Offer of Settlement

    Conklingville Dam

    E.J. West (2) Hydro Plant

    Feb. 28 754.11 +7.36 +5.57 0 4,080

    Mar. 31 760.6 (e) +10.0 (e) +12.5 (e) 0 350 (e) Notes: (1) Difference between current reservoir elevation and historic average or Level 3 (2) Release established by Regulating District

    (3) "(e)" represents estimated value (4) "NAVD” is North American Vertical Datum

    Indian Lake Reservoir The March average daily release from Indian Lake was approximately 195 cfs.

    Table 2.0 - Indian Lake Reservoir Elevation and Release

    Date Daily Average Elevation (1) Deviation (ft)

    Release

    (ft, NAVD) From Average From Target (cfs)

    Feb. 28 1,637.80 -2.31 -0.10 180

    Mar. 31 1,643.8 (e) +2.2 (e) +6.7 (e) 212 (e) Notes: (1) Local datum = NAVD elevation + 1617.63ft; spillway crest = 1651.01ft (33.38ft) (2) "(e)" represents estimated value

  • 2

    HUDSON RIVER AREA - MARCH SUMMARY- continued River Flow Hudson River flow, downstream of the confluence with the Sacandaga River, was approximately 8,780 cfs on March 30 and approximately 1,120 cfs above the historic average flow. Table 3.0 - Sacandaga, Indian, and Hudson River Flow

    River Monthly Average Flow

    Historic Average Flow (2)

    (cfs) (cfs)

    Sacandaga at Hope 2,670 (e) 1,640

    Sacandaga at Stewarts Bridge 2,390 (e) 1,990

    Indian at Indian Lake Dam 195 (e) 280

    Hudson at Hadley (1) 5,120 (e) 3,680

    Notes: (1) Above confluence with Sacandaga River (2) Based on USGS records (3) "(e)" represents estimated value (4) Gauge unavailable due to ice

    Precipitation Monthly total precipitation measured 88%, 96%, and 91% historic average at Indian Lake, Mayfield, and Conklingville, respectively, as of March 30 Table 4.0 - Hudson River Basin Precipitation - as of March 30

    Station Monthly Total Historic Average (inch) (inch)

    Indian Lake 2.71 3.08

    Mayfield 3.45 3.59

    Conklingville 3.29 3.63

  • 3

    HUDSON RIVER AREA - MARCH SUMMARY- continued Operation Overview Precipitation during the month of March was below normal across the Great Sacandaga Lake watershed and the Indian Lake watershed. The monthly inflow to Great Sacandaga Lake and Indian Lake reservoir was approximately 145% and 133% of historic average, respectively. Monthly release of water from Great Sacandaga Lake and Indian Lake measured 116% and 67% of historic average, respectively. Great Sacandaga Lake Operation Great Sacandaga Lake operation summary report for the period March 1, 2020 through March 29, 2020 is attached. This report includes projected and forecast values for dates after March 29, 2020. Hudson River Area Staff Activities Staff completed routine maintenance and operations activities during the month. A summary of Regulating District staff activities and work projects at the dam facilities is attached in the Administrator’s Report.

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    BLACK RIVER AREA – MARCH SUMMARY

    Reservoir Operations

    Stillwater Reservoir

    The March average daily release from Stillwater Reservoir was approximately 430 cfs. The maximum discharge for the month was 700 cfs.

    Table 1.0 - Stillwater Reservoir Elevation and Release

    Date Daily Average Elevation

    Deviation from Average Elevation

    Release

    (ft, NAVD) (ft) (1) (cfs) Feb. 28 1,664.40 -1.38 700

    Mar. 31 1,668.4 (e) +0.83 (e) 300 (e) Notes: (1) Difference between current reservoir elevation and historic average (2) "(e)" represents estimated value

    Sixth Lake Reservoir

    The March average daily release from Sixth Lake Reservoir was approximately 50 cfs. Table 2.0 - Sixth Lake Reservoir Elevation and Release

    Date Elevation (1) Deviation from Average Elevation (2)

    Release

    (ft, NAVD) (ft) (cfs)

    Feb. 28 1,779.35 -2.49 48

    Mar. 31 1,781.5 (e) -0.20 (e) 26 Notes: (1) Local datum = USGS datum (2) Difference between current reservoir elevation and historic average.

    (3) "(e)" represents estimated value

    Old Forge Reservoir

    The March average daily release from Old Forge Reservoir was approximately 110 cfs.

    Table 3.0 - Old Forge Reservoir Elevation and Release Date Elevation (1) Deviation from

    Average Elevation (2) Release

    (ft, NAVD) (ft) (cfs)

    Feb. 28 1,702.87 -0.71 116

    Mar. 31 1,704.1 (e) -0.3 (e) 41 (e) Notes: (1) Local Datum = USGS elevation

    (2) Difference between current reservoir elevation and historic average. (3) "(e)" represents estimated value

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    BLACK RIVER AREA - MARCH SUMMARY - continued

    River Flow

    The average daily Black River flow, as measured at the Watertown gauge, was approximately 6,150 cfs on March 29.

    Table 4.0 - Moose, Independence, Beaver, and Black River Flow

    River Monthly Average Flow

    Historic Average Flow (1)

    (cfs) (cfs)

    Moose at McKeever 1,967 (e) 1,107

    Beaver at Croghan 1,030 (e) 722

    Black at Watertown 9,160(e) 6,160

    Notes: (1) Based on USGS records (2) "(e)" represents estimated value

    (3) Stage and flow affected by ice in river Precipitation Monthly total precipitation measured 65%, 73%, 63% of historic average at Stillwater, Old Forge, and Sixth Lake, respectively, as of March 29.

    Table 5.0 - Black River Basin Precipitation - as of March 29

    Station Monthly Total Historic Average (inch) (inch)

    Stillwater 2.16 3.30

    Old Forge 2.66 3.63

    Sixth Lake 2.10 3.35

  • 6

    BLACK RIVER AREA - MARCH SUMMARY - continued Operation Overview Precipitation in the month of March was below average at Stillwater, Old Forge and at Sixth Lake. The monthly inflow to Stillwater Reservoir was approximately 131% of historic average. The inflow to Sixth Lake and Old Forge Reservoir totaled 0.20 and 0.44 billion cubic feet, respectively, in March. Release of water from Stillwater Reservoir averaged 106% of historic discharge. Black River Area Staff Activities A summary of Regulating District staff activities and work projects at the dam facilities is attached in the Administrator’s Report.

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    740 742 744 746 748 750 752 754 756 758 760 762 764 766 768 770 772 774

    El ev

    at io

    n (ft

    , 8 8

    N AV

    D )

    Date

    Great Sacandaga Lake 2020 Reservoir Elevation

    Historic Average Elevation Settlement Target Elevation 2020

    1635

    1637

    1639

    1641

    1643

    1645

    1647

    1649

    1651

    1653

    1655

    El ev

    at io

    n (ft

    , 8 8

    N AV

    D )

    Date

    Indian Lake 2020 Reservoir Elevation

    Historic Average Elevation Target Elevation 2020 ILA Target

  • 8

    1655

    1657

    1659

    1661

    1663

    1665

    1667

    1669

    1671

    1673

    1675

    1677

    1679

    1681

    El ev

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    n (ft

    , 8 8

    N AV

    D )

    Date

    Stillwater Reservoir 2020 Reservoir Elevation

    Historic Average Elevation Operating Elevation 2020

  • 9

    1778

    1779

    1780

    1781

    1782

    1783

    1784

    1785

    1786

    1787

    El ev

    at io

    n (ft

    , 8 8

    N AV

    D )

    Date

    Sixth Lake 2020 Reservoir Elevation

    Historic Average Elevation Target Elevation 2020

    1702

    1703

    1704

    1705

    1706

    1707

    1708

    El ev

    at io

    n (ft

    , 8 8

    N AV

    D )

    Date

    Old Forge 2020 Reservoir Elevation

    Historic Average Elevation Target Elevation 2020

  • Signature:__________________________________________________________________________________

    Date:_________________________ 8:13 AM U:\Hudson River Area\Hydrologic and Hydraulic\Sacandaga Reservoir\Great Sacandaga Lake Elevation Calculator - NAVD88.xlsx

    SACANDAGA RESERVOIR ELEVATION CALCULATOR Datum: Settlement Parameters 1988 NAVD Date 3/30/2020 Whitewater Daily Avg Daily Conditions

    Target Elevation 748.12 (hrs) (cfs) Date 3/30/2020 Actual "Level" 3.28 3 806 Day of Year 4838 Dan McCarty 744-2067 Eric Johnson "Level 2.5 threshold" 4 958 Starting Elevation (ft) 759.54 759.79 Piezometers 518-696-5807 863-8791 "Level 1.2 threshold" 740.42 5 1