reclaimed water and non-potable water at unc-ch sally hoyt, stormwater engineer
Post on 19-Dec-2015
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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.
Athletic Field Irrigation Landscape Irrigation
Indoor Use
Cogenera-tion
Hospital Chillers
UNC Chilled Water
UNC-CH Potable Water Use
UNC-CH Potable Water UsageComposite FY06-07 and FY07-08
Athletic Field Irrigation
Landscape Irrigation
Indoor Use
Cogeneration
Hospital Chillers
UNC Chilled Water
UNC-CH Future Water Use…2010
Athletic Field Irrigation Landscape Irrigation
Indoor Use
Cogenera-tion
Hospital Chillers
UNC Chilled Water
UNC-CH Future Water Use…?
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
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