8 Model Description    8.1.1  Everett Water Supply System    8.1.2  Reservoir Operations    8.1.3  Instream Flow Requirements    8.1.5  Conservation/Curtailment    8.1.6  Future Sources    8.1.7  Hydrologic Data

Two types of demands are important in determine the safe yield of the water supply for Everett: M&I demands and hydropower demands.  The hydropower releases from the Jackson project can be much larger than the M&I demands, depending on the storage levels in Spada Reservoir.  Weekly demand factors from the Snohomish County PUD’s Jackson Operations model (JKSOPR) were used to translate the annual demands to weekly demands.

The most recent M&I demand projections were obtained for this study (Figure 8.8).  These demands are based on the Forum Outlook, Phase I completed by R.W. Beck (R.W. Beck, 1999).  There are water districts in Snohomish County that do not use Everett water, and the proportion of those districts that will begin to buy wholesale water from Everett is unknown. However, it was estimated that their future growth will be met by Everett water.  This is the equivalent of 2 mgd every 10 years.  These projections are based on Puget Sound Regional council growth projections, which only extend to 2020. Since this research evaluates water systems through 2040, the demand projections were extrapolated.

Kimberly-Clark Corporation (formerly Scott Paper Company) is the single largest industrial user supplied by Everett, with an average daily demand of 34 mgd.  Transmission Line No. 4 solely serves Kimberly-Clark Corporation. It is expected that this demand will not increase in the future.

Everett also supplies seven wholesale water purveyors (Alderwood, Silver Lake, Mulkilteo, Snohomish County PUD, Marysville, Monroe, and Snohomish), and other customers.  The 1994 demand estimate for residential was 45.2 mgd average daily demand and 86.6 mgd peak.  This forecast includes the addition of future water purveyors (such as the City of Arlington and Granite Falls).

Table of Contents    8.2.1  Overall Seattle Operations    8.3.1  Overall Tacoma Operations