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Water Supply. A 50-Year Vision for the Community. Orange Water and Sewer Authority February 24, 2000. Existing System. Cane Creek Reservoir University Lake Quarry Reservoir. Existing System. Historic Demands - Raw Water. Water & Sewer Master Plan. Blueprint for the Future - PowerPoint PPT Presentation
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145753.B1.BD
Water SupplyWater Supply
Orange Water and Sewer AuthorityOrange Water and Sewer AuthorityFebruary 24, 2000February 24, 2000
A 50-Year Vision for the A 50-Year Vision for the CommunityCommunity
145753.B1.BD
Existing SystemExisting System
Cane Creek ReservoirCane Creek Reservoir
University LakeUniversity Lake
Quarry ReservoirQuarry Reservoir
145753.B1.BD
Existing SystemExisting System
145753.B1.BD
Historic Demands - Raw Historic Demands - Raw WaterWater
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5
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77 79 81 83 85 87 89 91 93 95 97 99
Raw
Wat
er D
eman
d (
mg
d)
Historic Growth Trend:0.221 mgd/yr
R2 = 0.982
145753.B1.BD
Water & Sewer Master Water & Sewer Master PlanPlan
Blueprint for the FutureBlueprint for the Future
All Aspects of Water and SewerAll Aspects of Water and Sewer
50-Year Planning Horizon50-Year Planning Horizon
Coordinated with Local PlansCoordinated with Local Plans
145753.B1.BD
Future Demand Future Demand ForecastsForecasts Assumptions:Assumptions:
Service Area Will Remain the SameService Area Will Remain the Same
Retail Sales OnlyRetail Sales Only
Moderate Growth of Past 25 Years Moderate Growth of Past 25 Years Will ContinueWill Continue
Buildout Likely By 2050Buildout Likely By 2050
145753.B1.BD
Future Demand Future Demand ForecastsForecasts Major Customer Major Customer Sectors:Sectors:
Single Family ResidentialSingle Family ResidentialMultifamily ResidentialMultifamily ResidentialUniversity/UNC HospitalsUniversity/UNC HospitalsCommercial/OtherCommercial/Other Irrigation-Only AccountsIrrigation-Only Accounts
145753.B1.BD
Major Customer SectorsMajor Customer Sectors
Com-mercial & Other
12%
Unac-counted
for Water8%
Treatment Process Water
6% Irrigation-Only
Accounts1%
Single Family
24%Multi-family22%
University & UNC
Hospitals26%
145753.B1.BD
Future Demand Future Demand ForecastsForecasts
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6
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10
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20
22
1980 1990 2000 2010 2020 2030 2040 2050
Raw
Wat
er D
eman
d (
mg
d)
Low Growth0.132 mgd/yr
Expected Growth
0.182 mgd/yr
Historic Growth
0.221 mgd/yr
High Growth0.236 mgd/yr
145753.B1.BD
Conservation Conservation OpportunitiesOpportunities
Service Area Already Is Relatively Service Area Already Is Relatively Water EfficientWater Efficient
Active Programs - Limited OpportunitiesActive Programs - Limited OpportunitiesPassive Conservation - Promising, but Passive Conservation - Promising, but
UnprovenUnproven
145753.B1.BD
Raw Water Supply Raw Water Supply CapacityCapacity Determined by:Determined by:
StreamflowStreamflow
Storage VolumeStorage Volume
Conveyance: Pumps & PipesConveyance: Pumps & Pipes
145753.B1.BD
Safe Yield:Safe Yield:
““The demand that can be The demand that can be
supported under specified supported under specified
operating conditions . . .”operating conditions . . .”
145753.B1.BD
Capacity of Existing Capacity of Existing SystemSystem
Hydrologic Safe Yield: Hydrologic Safe Yield: 15 mgd15 mgd
Sustainable Demand: Sustainable Demand: 11 mgd11 mgd
The Water Is There, But . . .The Water Is There, But . . .
Need for Bigger Pumps & PipesNeed for Bigger Pumps & Pipes
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Phase I Phase I ImprovementsImprovements
From 11 mgd to 15 mgdFrom 11 mgd to 15 mgd
Needed by 2010 (+/-)Needed by 2010 (+/-)
$10 Million$10 Million
Will Be Programmed In 15-Year Will Be Programmed In 15-Year Capital Improvements PlanCapital Improvements Plan
145753.B1.BD
SupplySupply & Demand & DemandWhat Next?What Next?
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1980 1990 2000 2010 2020 2030 2040 2050
Safe
Yie
ld (
mg
d)
Existing System
145753.B1.BD
SupplySupply & Demand & DemandPhase I ImprovmentsPhase I Improvments
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6
8
10
12
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24
1980 1990 2000 2010 2020 2030 2040 2050
Saf
e Y
ield
(m
gd
)
Existing System
Conveyance Upgrades
145753.B1.BD
Water Supply Water Supply Options?Options?
1 BG Quarry Volume1 BG Quarry Volume3 BG Quarry Volume3 BG Quarry VolumeDredge University LakeDredge University LakeNew Dam at University LakeNew Dam at University LakeRaise Dam at Cane CreekRaise Dam at Cane CreekNew Reservoir at Sevenmile CrNew Reservoir at Sevenmile Cr
145753.B1.BD
Water Supply Options Water Supply Options (cont)(cont)
Jordan LakeJordan LakePurchase Water from Purchase Water from
OthersOthersNo ActionNo Action
145753.B1.BD
SupplySupply & Demand & DemandAdditional Storage Additional Storage
VolumeVolume
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20
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24
1980 1990 2000 2010 2020 2030 2040 2050
Safe
Yie
ld (
mg
d)
Existing System
Conveyance Upgrades
1 BG Quarry
145753.B1.BD
SupplySupply & Demand & DemandAdditional Storage Additional Storage
VolumeVolume
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10
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20
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24
1980 1990 2000 2010 2020 2030 2040 2050
Saf
e Y
ield
(m
gd
)
Existing System
3 BG Quarry
Conveyance Upgrades
1 BG Quarry
145753.B1.BD
The Preferred The Preferred Option:Option:3 BG Quarry 3 BG Quarry ReservoirReservoir
Extension of the American Extension of the American Stone quarry across Bethel-Stone quarry across Bethel-Hickory Grove Church Road Hickory Grove Church Road onto OWASA pro-perty.onto OWASA pro-perty.
145753.B1.BD
Proposed Quarry Proposed Quarry ExtensionExtension
145753.B1.BD
Responsible Responsible Planning . . .Planning . . .
Safeguard for Uncertain FutureSafeguard for Uncertain FutureReduced DrawdownsReduced DrawdownsBetter Drought ProtectionBetter Drought ProtectionMore Operational FlexibilityMore Operational FlexibilityFuture Releases to Morgan CreekFuture Releases to Morgan Creek
145753.B1.BD
Responsible PlanningResponsible Planning
Sustainable Resource Management:Sustainable Resource Management:
A key principle of sustainability is to A key principle of sustainability is to manage resources today in ways that manage resources today in ways that maintain a full range of opportu-nities maintain a full range of opportu-nities for future generations.for future generations.
145753.B1.BD
Would We Still Would We Still Have to Use Jordan Have to Use Jordan Lake?Lake?
With the 20.5 mgd system safe With the 20.5 mgd system safe yield provided by 3 bg of quarry yield provided by 3 bg of quarry capacity, it is unlikely that capacity, it is unlikely that OWASA will have to rely on Jordan OWASA will have to rely on Jordan Lake to meet its water supply Lake to meet its water supply needs during the next 50 years.needs during the next 50 years.
145753.B1.BD
Impacts of Quarry Impacts of Quarry Extension?Extension?
“ “The proposed project appears to pose no The proposed project appears to pose no significant threat to human health, significant threat to human health, safety, or natural resourc-es. No safety, or natural resourc-es. No evidence of past or present significant evidence of past or present significant threats to health from silica dust, radon, threats to health from silica dust, radon, traffic impacts, or water quality could be traffic impacts, or water quality could be identified through the research identified through the research conducted un-der this study.”conducted un-der this study.”
145753.B1.BD
Summary:Summary:
OWASA finds the quarry extension to be the preferred alternative for meet-ing the long term water supply needs of its customers in a manner that is consistent with the community’s values of environmental stewardship and sus-tainable growth.
