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Water Supply

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

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Water Supply

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

  7. Future Demand ForecastsMajor 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 CapacityDetermined 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 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.

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