Reclaimed Water
and
Non-Potable Water
at UNC-CH
Sally Hoyt, Stormwater Engineer
What is Non-Potable Water?
Water from multiple sources that is suitable for
non-potable uses
• Cooling Towers
• Toilet Flushing
• Irrigation
Sources of non-potable water at UNC are
• Reclaimed Water from OWASA
• Stormwater
Why Non-Potable Water?
Water Conservation
• Campus sustainability
– LEED Buildings
• State water conservation requirements
– 20% indoor
– 50% outdoor
Achieved >25% reduction through demand-side efforts.
Non-potable water looks at supply-side.
UNC-CH Potable Water Use
Athletic Field
Irrigation
Landscape
Irrigation
UNC Chilled
Water
Indoor Use
Hospital
Chillers
Cogeneration
UNC-CH Potable Water Usage
Composite FY06-07 and FY07-08
UNC-CH Future Water Use…2010
Athletic Field
Irrigation
Landscape
Irrigation
UNC Chilled
Water
Indoor Use
Hospital
Chillers
Cogeneration
UNC-CH Future Water Use…?
Athletic Field
Irrigation
Landscape
Irrigation
UNC Chilled
Water
Indoor Use
Hospital
Chillers
Cogeneration
Why are we using Reclaimed Water?
UNC-OWASA-Community Benefits:
• Reduce risk to droughts
• Save drinking water for human use
• Defer need for expanding water supply
and/or treatment plant capacity
• Expand total supply of water to the
community
• Reduce discharge of nutrients
OWASA RCW Facility
Funding
• UNC Funding > $10,000,000
• Debt funded with legislative approval
• Debt paid by University internal customers
through RCW rates
Why Rainwater Harvesting?
• Town Stormwater Design Criteria (2001) –
Adds Volume Control
• Jordan Lake Rules (2009) – Nutrient Reduction
Hooker Field Cistern
500,000 gal – Athletic Field Irrig.
Ramshead Cistern
56,000 gal – Landscape Irrigation
FedEx Global Ed Cistern
54,000 gal – Toilet Flushing
Hanes Cistern
60,000 gal – Landscape Irrigation
Boshamer Cistern
80,000 gal – Athletic Field Irrigation
Bell Tower Cistern
300,000 gal – Toilet Flushing,
Landscape & Athletic Field Irrig.
MAP