Water Supply

1
Water Supply
A 50-Year Vision for the Community

• Orange Water and Sewer Authority
• February 24, 2000

2
Existing System

• Cane Creek Reservoir
• University Lake
• Quarry Reservoir

3
Existing System
4
Historic Demands - Raw Water
5
Water Sewer Master Plan

• Blueprint for the Future
• All Aspects of Water and Sewer
• 50-Year Planning Horizon
• Coordinated with Local Plans

6
Future Demand Forecasts Assumptions

• Service Area Will Remain the Same
• Retail Sales Only
• Moderate Growth of Past 25 Years Will Continue
• Buildout Likely By 2050

7
Future Demand Forecasts Major Customer Sectors

• Single Family Residential
• Multifamily Residential
• University/UNC Hospitals
• Commercial/Other
• Irrigation-Only Accounts

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Major Customer Sectors
9
Future Demand Forecasts
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Conservation Opportunities

• Service Area Already Is Relatively Water
  Efficient
• Active Programs - Limited Opportunities
• Passive Conservation - Promising, but Unproven

11
Raw Water Supply Capacity Determined by

• Streamflow
• Storage Volume
• Conveyance Pumps Pipes

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Safe Yield

• The demand that can be supported under specified
  operating conditions . . .

13
Capacity of Existing System

• Hydrologic Safe Yield 15 mgd
• Sustainable Demand 11 mgd
• The Water Is There, But . . .
• Need for Bigger Pumps Pipes

14
Phase I Improvements

• From 11 mgd to 15 mgd
• Needed by 2010 (/-)
• 10 Million
• Will Be Programmed In 15-Year Capital
  Improvements Plan

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Supply DemandWhat Next?
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Supply DemandPhase I Improvments
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Water Supply Options?

• 1 BG Quarry Volume
• 3 BG Quarry Volume
• Dredge University Lake
• New Dam at University Lake
• Raise Dam at Cane Creek
• New Reservoir at Sevenmile Cr

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Water Supply Options (cont)

• Jordan Lake
• Purchase Water from Others
• No Action

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Supply DemandAdditional Storage Volume
20
Supply DemandAdditional Storage Volume
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The Preferred Option3 BG Quarry Reservoir

• Extension of the American Stone quarry across
  Bethel-Hickory Grove Church Road onto OWASA
  pro-perty.

22
Proposed Quarry Extension
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Responsible Planning . . .

• Safeguard for Uncertain Future
• Reduced Drawdowns
• Better Drought Protection
• More Operational Flexibility
• Future Releases to Morgan Creek

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Responsible Planning

• Sustainable Resource Management
• A key principle of sustainability is to manage
  resources today in ways that maintain a full
  range of opportu-nities for future generations.

25
Would We Still Have to Use Jordan Lake?

• With the 20.5 mgd system safe yield provided by
  3 bg of quarry capacity, it is unlikely that
  OWASA will have to rely on Jordan Lake to meet
  its water supply needs during the next 50 years.

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Impacts of Quarry Extension?

• The proposed project appears to pose no
  significant threat to human health, safety, or
  natural resourc-es. No evidence of past or
  present significant threats to health from silica
  dust, radon, traffic impacts, or water quality
  could be identified through the research
  conducted un-der this study.

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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 communitys values of
  environmental stewardship and sus-tainable
  growth.