Download - Youghiogheny River Lake Storage ReAllocation for Downstream Water Supply by Werner C. Loehlein, P.E
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Youghiogheny River LakeStorage ReAllocation for
Downstream Water Supply
byby
Werner C. Loehlein, P.E.Werner C. Loehlein, P.E.
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Uncontrolled
Area controlled by Youghiogheny Lake434 square miles
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Youghiogheny River Watershed
Drainage areasDrainage areas• Total Basin = 1,764 square milesTotal Basin = 1,764 square miles• Youghiogheny River Lake = 434 square Youghiogheny River Lake = 434 square
milesmiles• Controls 25% of total basinControls 25% of total basin
• Connellsville = 1,326 square milesConnellsville = 1,326 square miles• Percent controlled = 33%Percent controlled = 33%
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Youghiogheny River Lake
• In 1936, was authorized for the purposes of:
• Reducing flood stages (flood control) and
• Low water regulation for water quality control along the Youghiogheny, lower Monongahela, and upper Ohio Rivers
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Youghiogheny River Lake Storage Schedule
Full Pool
Summer Pool
Minimum Pool
- 1470
- 1439
- 1419
- 1344
Pool
Elevation
J F M A M J J A S O N D Months
Winter Pool
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• After Youghiogheny dam was placed in operation, Congress granted general authority to all Corps reservoirs for the following limited purposes:
• Recreation
• Fish and wildlife conservation
• Threatened & endangered species preservation
• However, no storage was allocated or reallocated to these purposes
Youghiogheny River Lake
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Youghiogheny River Lake
• In 1988, downstream (whitewater rafting) and upstream recreation was added as an authorized project purpose.
• No storage was allocated or reallocated to this purpose.
• “… operated in such manner as will protect and enhance recreation associated with such project” and to the extent that recreation is compatible with other project purposes.
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Youghiogheny River Lake
• In 1989, commercial hydropower was added to the facility.
• The hydropower that is currently being generated, however, does not require any change from the previous operational procedures, and as a result is not a project purpose.
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Yough River LakeWater Management & Reallocation Study
Chronology
1991
1992
A severe drought occurred during the year.
For the first time, the MAWC exceeded the 20-MGD for 30-days average withdrawal rate criteria of their PADEP water supply permit at their Connellsville plant. Per this permit, the MAWC is required to identify an upstream water source for withdrawals between 28 MGD and 42 MGD.
The MAWC requests assistance from Congress to secure the federal portion of funding for the USACE to complete a water management and storage reallocation study for Youghiogheny River Lake.
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Yough River LakeWater Management & Reallocation Study
Chronology
An Initial Assessment (IA) phase of the study (100% federally funded) was completed by the USACE. The conclusion of the IA was that the potential exists to reallocate a small portion of Youghiogheny River Lake storage to water supply.
The Reconnaissance phase of the study (100% federally funded) was completed by the USACE. The study defined a possible alternative, a public interest, and a cost sharing partner (MAWC) for the detailed Feasibility phase.
1993
1995-97
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Yough River LakeWater Management & Reallocation Study
Chronology
1999-2003 The Feasibility phase of the study (50-50 cost shared) is conducted by the USACE and the MAWC, including full public involvement.
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Key Study AuthoritiesSection 216 of Public Law 91-611
Under this section the Corps can review the operation of Youghiogheny River Lake and report to Congress with recommendations on the advisability ot making a modification in the overall public interest.
Public Law 101-640
This law requires that any change to a water control plan, regardless of purpose, must be developed with full public involvement.
National Environmental Policy Act (NEPA) of 1969
This act addresses environmental impacts as interpreted by 40 CFR 1500-1508.
(CFR is Code of Federal Regulations)
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Purpose of Study:
Determine if we can accommodate a Determine if we can accommodate a
request for an additional 25 cfs (17MGD) request for an additional 25 cfs (17MGD)
from MAWCfrom MAWC
Determine if we can improve the current Determine if we can improve the current
operating schedule at Youghiogheny River operating schedule at Youghiogheny River
lakelake
Evaluate impacts of proposed changesEvaluate impacts of proposed changes
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Youghiogheny River Lake
• MAWC needs an additional 25 cfs (17mgd) to meet the their future projected water supply needs.
• Corps is willing to change how water is released during average to wet years to better meet the current needs of the Corps stakeholders.
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How Much Water Are We Talking About?
Average flow rate at Connellsville (1925-1997):
= 2,620 cubic feet per second (cfs)
= 4,061 million gallons per day (MGD)
Average stage at the Connellsville gage = 3.87 feet (‘)
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How Much Water Are We Talking About?
MAWC water withdrawal
20 MGD = 31 cfs
28 MGD = 44 cfs
44 MGD = 69 cfs
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What Happens at Connellsville?
Q Q 7-107-10 (Current) (Current) = 460 cfs= 460 cfs
QQ7-107-10 (Proposed) (Proposed) = 490 cfs= 490 cfs
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Current MAWC Withdrawal at Connellsville Under
Average Flow Conditions
98%
2%
Average Flow
2,620 cfs
MAWC Withdrawal
2 %
Water continuing downstream
98 %
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Proposed MAWC Full Withdrawal at Connellsville
Under Average Flow Conditions
97%
3%
Average Flow
2,620 cfs
MAWC Withdrawal
3 %
Water continuing downstream
97 %
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Contribution of Youghiogheny River Lake to Flow at Connellsville under Low Flow Conditions
Natural Flow22%
Flow from Storage
78%
Total Flow
460 cfs
Natural flow
100 cfs
Flow from storage
360 cfs
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Current MAWC Withdrawal at Connellsville
Under Low Flow Conditions10%
90%
Low Flow
460 cfs
MAWC Withdrawal
10%
Water Continuing Downstream
90% (415 cfs)
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ProposedMAWC Withdrawal at Connellsville
Under Low Flow Conditions
14%
86%
Low Flow
490 cfs
MAWC Withdrawal
14%
Water Continuing downstream
86% (420 cfs)
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1997 Reconnaissance Study
• Looked at 1991 (extremely dry year) and 1992 Looked at 1991 (extremely dry year) and 1992 (wet year)(wet year)
• Two alternatives:Two alternatives:• #1 - meets MAWC water supply request only#1 - meets MAWC water supply request only• #2 - meets MAWC water supply request and #2 - meets MAWC water supply request and
reduces lake drawdowns during average and reduces lake drawdowns during average and wet yearswet years
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Current Feasibility Study
• Looked at the entire period of recordLooked at the entire period of record• Refined alternative #1 = Alternative #5Refined alternative #1 = Alternative #5• Refined alternative #2 = Alternative #6Refined alternative #2 = Alternative #6• Included public inputIncluded public input
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What Does the Reallocation of Storage Mean?
Minimum Pool 1344.0
Summer Pool 1439.0
• Currently, Youghiogheny River Lake has 146,760 acre-feet of water for low flow regulation for water quality enhancement.
• This volume exists between the summer pool elevation of 1439.0 feet and the minimum pool elevation of 1344.0 feet.
• Reallocating is re-defining the use for this water to water quality “and” water supply.
Water for Low flow regulation
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How Much Water Will Be Reallocated For Water Supply?
Minimum Pool
Summer Pool
Full Pool
Flood Control (summer) = 39% to 39% Water Quality (summer) = 59% to 55% Water Supply
= 0% to 4% Inactive (Below Minimum Pool) = 2% to 2%
Current to Proposed
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Why Doesn’t the Corps Raise the Lake?
Summer Pool
Space Available for Flood Control
Full Pool
• Encroachment into this space decreases the lake’s capability to store flood waters.
• The space above Summer Pool is for Flood Control.
• To maintain the same Flood Control Space and amount of Low Water Regulation, the dam would have to be raised.
• This study did not change the project’s Flood Control capability.
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Reallocation of Storage
Current Release
Schedule
1997 Recon. Study
Alternative
#2
2003 Feas. Study
Alternative
#6
400400
350350
300300
200200
425425
375375
275275
175175
500500
450450
400400
300300
UncontrolledFlow
0-1000-100
100-300100-300
300-500300-500
500-1000500-1000
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What Is the Impact to the Youghiogheny River at Connellsville
During Periods of Low Water?
Sample Cross Section at Connellsville
460 cfs = 1.89 ft (Current)
490 cfs = 1.93 ft (Proposed)
Difference = .04 foot = 0.5 inch
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YOUGHIOGHENY RIVER LAKE WATER MANAGEMENTAND REALLOCATION FEASIBILITY STUDY
STAGE DURATION CURVES
0
1
2
3
4
5
6
7
8
0 10 20 30 40 50 60 70 80 90 100
PERCENT OF TIME STAGE EQUALLED OR EXCEEDED
RIV
ER
ST
AG
E A
T Y
OU
GH
DA
M O
UT
FLO
W (
FEE
T)
Current Alternative 5 Alternative 6
YOUGHIOGHENY RIVER LAKE OUTFLOWJANUARY - DECEMBER
REGULATED
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“Water Quantity” Summary
• The proposed release schedule change (Alternative #6).• Provides the projected water supply needs.• Provides reduced lake drawdowns during average and
wet years.• Provides a slightly more stable river.
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Water Quality Impacts
Slight Change in Water Temperature Benefits from Increased Base Flows
CONCLUSION: No Significant Impacts
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What Was Done in the Feasibility Study?
Evaluated various alternatives to provide Evaluated various alternatives to provide quantity neededquantity needed
Evaluated alternatives to determine Evaluated alternatives to determine potential impactspotential impacts
Solicited input from other agencies, local Solicited input from other agencies, local interest groups, and the general public interest groups, and the general public during past meetings, via mail, etc.during past meetings, via mail, etc.
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List of Stakeholder Meetings
June 3, 1999 Study Initiation (Public) Meeting
Connellsville Municipal Building
• Outlined Feasibility Study Plan
• Informed Stakeholders
• Identified Steering Committee members
July 13, 1999 Briefing for Fayette Forward Environmental Action Committee
Fayette Forward Conference Room Uniontown, PA
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List of Stakeholder Meetings
December 3, 1999 First Steering Committee (Public) Meeting PSU, Fayette Campus –
Uniontown, PA
• Presented water quantity analysis
• Solicited stakeholder feedback
• Solicited public input to identify potential environmental impacts
• Beginning of water quality analysis phase
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List of Stakeholder Meetings
January 31, 2000 Briefing for Youghiogheny River Outfitters
Federal Building – Pittsburgh, PA
June 5, 2000 Meeting with Pennsylvania Fish and Boat Commission (PAFBC)
Federal Building – Pittsburgh, PA
• Presented draft of water quality findings
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List of Stakeholder MeetingsJune 23, 2000 Briefing for Youghiogheny River Council
Fireman’s Park – Sutersville, PA
September 7, 2000 Meeting with technical sub-committee of the Steering Committee
Federal Building – Pittsburgh, PA
• Reviewed water quantity analysis
• Presented water quality findings
• Solicited feedback
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List of Stakeholder Meetings
February 7, 2001 Public and Steering Committee Meeting - Connellsville, PA
• Reviewed water quantity analysis
• Reviewed water quality findings
• Began NEPA Compliance
• Solicited feedback
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Most Recent Activity
• Draft feasibility report and environmental assessment was completed in November 2002.
• Public review period December 2002 – January 2003.
• Completed Feasibility Report and associated NEPA requirements completed and signed by the District Commander in October 2003.
• Prepared and negotiated a water supply agreement between the MAWC and the US government
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What’s Next ?
• Submit documents through our chain for approval
• Approve the implementation of the Feasibility Study recommendation (including the execution of the water supply agreement).
• Implement sometime in 2004.
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Lessons learned
Keep it simple – A huge challenge for Keep it simple – A huge challenge for technical people.technical people.
Be careful with the words that you use Be careful with the words that you use
(MGD vs CFS, Q 7-10)(MGD vs CFS, Q 7-10) Don’t under-estimate the damage caused by Don’t under-estimate the damage caused by
those who use the public forum for those who use the public forum for posturing. posturing.