Water Supply - PowerPoint PPT Presentation

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Water Supply

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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 ... – PowerPoint PPT presentation

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Title: 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

8
Major Customer Sectors
9
Future Demand Forecasts
10
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

12
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

15
Supply DemandWhat Next?
16
Supply DemandPhase I Improvments
17
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

18
Water Supply Options (cont)
  • Jordan Lake
  • Purchase Water from Others
  • No Action

19
Supply DemandAdditional Storage Volume
20
Supply DemandAdditional Storage Volume
21
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
23
Responsible Planning . . .
  • Safeguard for Uncertain Future
  • Reduced Drawdowns
  • Better Drought Protection
  • More Operational Flexibility
  • Future Releases to Morgan Creek

24
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.

26
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.

27
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.
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