Department of Water Management

There are number of ways to save water, and they all start with you.

Department of Water Management

Water Supply Update

Drought/Water ForumJanuary 8, 2008

Department of Water Management

There are number of ways to save water, and they all start with you.

North Carolina Drought Monitor

Department of Water Management

There are number of ways to save water, and they all start with you.

Department of Water Management

There are number of ways to save water, and they all start with you.

Current Conditions – 1/6/08

• Lake Michie: 327.90 ft. (13.10 ft. below full)• Little River Reservoir: 332.40 (22.60 ft. below full)• Average Demand (12/31/07 – 1/6/08): 18.35 MGD

Department of Water Management

There are number of ways to save water, and they all start with you.

How is “days of supply” determined?

• Snap shot of current conditions• Uses major assumptions

• Current usable volume in lakes• No additional inflow• No additional rainfall• Average daily demand ( 30-day average)

• Uses computer model specifically developed for Durham, 78 years of stream flow, evaporation and precipitation data

• Model runs weekly throughout the year• Can produce “what if” scenarios• Displays a “risk of failure”

Department of Water Management

There are number of ways to save water, and they all start with you.

Days of Supply as of 1/6/08

• Assumptions:• Average demand (30-day running avg.): 18.87 MGD*• Zero Flow into lakes• Zero Rainfall • No reduction in demand (*demand on lakes only; does not include purchases)

• Lake Michie and Little River: 87 days • Teer Quarry: 31 days• Below Intake Structures: 64 days• TOTAL: 182 days

Department of Water Management

There are number of ways to save water, and they all start with you.

Where are we now?

• Stage IV, Severe Mandatory Conservation became effective Monday, December 3rd

• Goal: 50% reduction

• 40% reduction – when comparing 30-day running average on Sept. 21st (35.28 MGD) to 30-day running average on Jan. 6th (21.26 MGD)

• 11% reduction when compared to January 2007

Department of Water Management

There are number of ways to save water, and they all start with you.

Water Supply Status Updates

Department of Water Management

There are number of ways to save water, and they all start with you.

Stage IV - Requirements

Stage IV restrictions:• No watering or sprinkling of any lawn or grass.• No watering of trees, ornamental shrubs, or veg. gardens

except by hand-held container on Saturdays, between the hours of 5 a.m. and 8 a.m. OR 5 p.m. and 8 p.m.

• Water may not be used to wash down outside areas such as patios, driveways, sidewalks.

• Restaurants may not serve water except upon request by the customer.

• Use water for any unnecessary purpose or intentionally waste water.

Department of Water Management

There are number of ways to save water, and they all start with you.

Stage IV - RequirementsStage IV restrictions (continued):• No water may be introduced into wading pools or

swimming pools or replenish any filled pool except to maintain operation of chemical feed equipment.

• No water may be introduced into any decorative fountain, pool or pond except where the water is recycled.

• No washing of a motor vehicle or other type of mobile equipment. Commercial car wash facilities or individuals regularly engaged in the business of washing vehicles CAN operate when 50% water savings are documented.

Department of Water Management

There are number of ways to save water, and they all start with you.

Stage IV - Requirements

• All industrial, manufacturing, and commercial enterprises shall reduce consumption with a goal reduction of at least 50%. Such enterprises shall document the specific efforts they have made to reduce consumption.

Department of Water Management

There are number of ways to save water, and they all start with you.

Water Supply Options – short term• Access to Jordan Lake Allocation (up to 10MGD)

Through Town of Cary water system• Limited by conveyance systems• Approximately 1.36 MGD since 9/25/07• Increased to 2.2 MGD on 10/3/07• Working w/Cary staff to increase this to 4 MGD

• Reserve volume in Lake Michie and Little River Lake• Approximately 1.2 billion gallons• Difficult to access• Water quality – not typical of what customers

expect; may prove more difficult to treat; staff conducting tests to evaluate

Department of Water Management

There are number of ways to save water, and they all start with you.

Water Supply Options –short term

• Accelerate planned 2nd interconnection with Cary – potentially online mid-summer 2008 (7 MGD)

• Agreements with OWASA Hillsborough Orange-Alamance Other options through interconnections

Department of Water Management

There are number of ways to save water, and they all start with you.

Teer Quarry – Short Term

•Making temporary connection to the Teer Quarry to access some of the water

•Approximately 600 MG (40% full)

•Additional 25 to 30 days of water

Department of Water Management

There are number of ways to save water, and they all start with you.

Teer Quarry – Long term• Feasibility Study - completed October 2003 • Preliminary Engineering Contract 

Started March 2005 Report Completed in Nov. 2005 Draft Environmental Assessment submitted to state

in Sept. 2006» Received comments – December 2006 » Resubmitted – February 2007» Received comments – July 2007» Anticipated re-submittal – November 2007

• Funding for Engineering Design in current year• Construction 2009, online 2010

Department of Water Management

There are number of ways to save water, and they all start with you.

Additional Long Term Supply

• Construct intake on Jordan Lake to access current 10 MGD allocation (partnerships?)

• Construct additional treatment plant in close proximity to Jordan Lake (partnerships)

• Additional allocation from Jordan Lake• Expansion of Lake Michie (24 MGD)

Department of Water Management

There are number of ways to save water, and they all start with you.

Next Steps?

Stage V. Stringent Mandatory Conservation. Customers shall be encouraged to observe the conservation measures in Stages I and II and required to continue observing the mandatory requirements in Stages III and IV. The level of the conservation effort shall increase to require the following additional mandatory measures. No person shall: •Use water outside a structure except in an emergency involving fire.•Operate evaporative air conditioning units which recycle water except during the operating hours of the business.•Use any swimming pool or wading pool.•Wash any motor vehicle, including commercial washing unless a private well is used.•In addition to the conservation measures enumerated above, customer shall use plates, glasses, cups and eating utensils that are disposable and biodegradable.

Department of Water Management

There are number of ways to save water, and they all start with you.

Questions