1. Orange Water and Sewer Authority February 24, 2000
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 & Demand What Next?

16. Supply & Demand Phase 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 & Demand Additional Storage Volume

20. Supply & Demand Additional Storage Volume

21. The Preferred Option: 3 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 community’s values of environmental stewardship and sus-tainable growth.