1. 2 interstate commission on the potomac river basin (icprb) icprb represents 5 states. mission:...
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Interstate Commission on the Potomac River Basin
(ICPRB)
• ICPRB represents 5 states.• Mission: enhance, protect and conserve
the water and associated land resources of the Potomac River basin and its tributaries through regional and interstate cooperation.
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ICPRB - Four major areas of interest
• Public information
• Water resources, quantity, and supply
• Water quality
• Living resources
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BASIN ISSUES - SOCIAL
Economy, Growth and DevelopmentBasin ImpactExpanded Commuting Expanded Development Expanded Demand for Water
Power DeregulationNew Plant ProposalsConsumptive Use Impacts
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BASIN ISSUES - ENVIRONMENTAL
Low Flow at Little FallsEnvironmental Needs PerceptionMD DNR
Improved Water Quality Blue Plains Return to EstuaryImproved Water Quality in Estuary BNR
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670 0 70 140 Miles
N
EW
S
Metro Washington service area supplied by CO-OP utilities in the Potomac Basin
Interstate Commission on the Potomac River Basin June 2000Source: WSSC, FCWA, USACE
Potomac River Basin and the portion of the Washington metropolitan area served (in part) by the Potomac River
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Washington area: three major water suppliers
• The three suppliers provide water to a total of 3.6 million people.
• These suppliers cooperate during droughts, pooling their resources to maximize water supply reliability.
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Overview of study area and resources
OccoquanRiver
PatuxentRiver
PotomacRiver
Fairfax CountyWater Authority
Washington Suburban Sanitary Commission
Rockville DPW
Washington Aqueduct COE
Major Source
CO-OP utility
Wholesale or independent utility
Key:
District of Columbia Water and Sewer Authority
Arlington County DPW
Falls Church DPW
Vienna DPW
Prince William Service Authority
Virginia American Water Co.
Loudoun County Sanitation Authority
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1070 0 70 140 Miles
N
EW
S
Metro Washington service area supplied by CO-OP utilities in the Potomac Basin
Interstate Commission on the Potomac River Basin June 2000Source: WSSC, FCWA, USACE
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Water supply intakes and portion of Potomac River protected by environmentalflow recommendation.
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1960-70’s forecast of Potomac shortages
• In times of low-flow, predicted demands are higher than flow.
• Implication: The COE, the most downstream water user, would run out of water if nothing were done.
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Proposed structural solutions
• Series of 16 reservoirs
• Interbasin transfers
• Pilot estuarine treatment plant
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LFAA - 1978
• No jurisdiction would suffer disproportionate shortages.
• Water rationed as a percentage of the normal wintertime water use.
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Water Supply Coordination Agreement (1981)
• Mandates that suppliers coordinate operation of all facilities.
• Minimizes chances of a shortfall.
• Payment formula for future water supplies based on incremental growth ratios.
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Little Seneca
Jennings Randolph
Potomac Basin and water supply reservoirs
Occoquan
Patuxent
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Jennings Randolph Reservoir
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Little Seneca Reservoir
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Patuxent (Duckett) Reservoir
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Occoquan Reservoir
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Little Falls intake
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Little Falls flow near Washington DC , summer 1999
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100
200
300
400
500
600
700
800
900
1,0006/
23/9
9
6/30
/99
7/7/
99
7/14
/99
7/21
/99
7/28
/99
8/4/
99
8/11
/99
8/18
/99
8/25
/99
Flo
w (
mil
lion
gal
lons
per
day
)
Jennings Randolph Release
Flow target
Flow that would have occurred without a release
Flow that would have occurred without a release
Jennings Randolph release
Target
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100
1,000
10,000
100,000
1-J
an
1-F
eb
1-M
ar
1-A
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1-M
ay
1-J
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1-J
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1-A
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1-S
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1-O
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1-N
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1-D
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Flo
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an
ds
, mg
d
.
1999 Potomac withdrawals plus environmental flow recommendation
Note: Little Falls 1929-1997 flow adjusted to represent that flow before metro Washington withdrawals and after Jennings Randolph and Savage reservoirs' water quality augmentation releases
Potomac flows and demands
Higher flows
Median flows
Minimum flows
Demands
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Drought Management Issues
• Public response plan
• Media outreach and communications
• Practiced drought operations
• Utility and regional cooperation
• Planning for future demands
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Drought website (http://www.potomacriver.org, follow link for “Drought Exercise 2000”)
• Water supply status and key operational data are updated each day during droughts and for drought exercises including:– Reservoir storage,
– River flow,
– Precipitation forecasts,
– Utility withdrawals, and
– Daily summaries.
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Today’s probability of meeting demand
• If the worst recorded drought were to occur this summer, the three major Washington metropolitan area suppliers would be able to meet water demands.
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Tomorrow’s probability of meeting demand
• ICPRB continues to assess the reliability of the current water supply system for the Washington metropolitan area. The most recent study was completed in 2000 and is available at: www.potomacriver.org/metrostudy.html
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Benefits of regional cooperation
• Smooth operations during drought.
• Systems based operating strategies minimize possibility of shortfall.
• Stronger management and a unified voice.
• Trust in the procedures and institutions in place.