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CW DMAG Update September 1, 2011

The following are the Low Inflow Protocol (LIP) drought indicators as of September 1, 2011:

September 1, 2011
Current Overall Stage = Stage 1
Storage Index (SI): 62.0%
Target Storage Index 75.0%
Ratio 82.7% (Supports Stage 1 Conditions)

Streamflow Indicator
(four and six-month average versus historical four and six-month average)

Ratio= 54.3% (four-month average) (Supports Stage 3 Conditions)
Ratio= 74.0% (six-month average) (Supports Stage 1 Conditions)


US Drought Monitor (three-month average) (Using worst weighted condition method for Drought Monitor)
Three-month Numeric Average =  0.08 (Supports Stage 0 Conditions)

Groundwater Gauges (monthly basis): 

The Langtree groundwater gauge reading is in Normal condition.
The Glen Alpine groundwater gauge reading is in Stage 3 condition.


Owners of Public Water Supply intakes and owners of intakes used for irrigation with a capacity greater than 100,000 gallons per day will complete the following activities within 14 days after the Stage 1 LIC declaration:

  1. Notify their water customers and employees of the Low Inflow Condition through public outreach and communication efforts.
  2. Request that their water customers and employees implement voluntary water use restrictions, in accordance with their drought response plans, which may include:
  • Reduction of residential vehicle washing.
  • Reduction of lawn and landscape irrigation to no more than two days per week (i.e. residential, multi-family, parks, streetscapes, schools, etc).

At this stage, the goal is to reduce water usage by 3-5% (or more) from the amount that would otherwise be expected.  The baseline for this comparison will be generated by each entity and will be based on existing conditions (i.e. drought conditions).  For the purposes of determining ‘the amount that would otherwise be expected’, each entity may give consideration to one or more of the following:

  • Historical maximum daily, weekly, and monthly flows during drought conditions.
  • Increased customer base (e.g. population growth, service area expansion) since the historical flow comparison.
  • Changes in major water users (e.g. industrial shifts) since the historical flow comparison.
  • Climatic conditions for the comparison period.
  • Changes in water use since the historical flow comparison.
  • Other system specific considerations.

Provide a status update to the CW-DMAG on actual water withdrawal trends.  Discuss plans for moving to mandatory restrictions, if required.