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.

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

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 Cistern500,000 gal – Athletic Field Irrig.

Ramshead Cistern 56,000 gal – Landscape Irrigation

FedEx Global Ed Cistern54,000 gal – Toilet Flushing

Hanes Cistern 60,000 gal – Landscape Irrigation

Boshamer Cistern80,000 gal – Athletic Field Irrigation

Bell Tower Cistern300,000 gal – Toilet Flushing,

Landscape & Athletic Field Irrig.

MAP