Tulalip Tribes 11/9/2016 - Laserfiche WebLink

TECHNICAL MEMORANDUM (CONTINUED) Conclusion: Based on the above evaluation, it is recommended that the Tribe plan for future increases in water usage of 5 to 7 percent per year. This slightly conservative projection will allow the Tribe time to plan water system upgrades and ensure they can maintain adequate water delivery to all customers. 2013 Water Demand Forecast-6, 10,and 15 Years Table 2-1 presents water demand projections based on a 5 percent annual increase. Table 2-1.Water Use Projection Based on 5 Percent Increase per Year Existing 6-Year Forecast 10-Year Forecast 15-Year Forecast (2013) (2019) (2023) (2028) ADD MDD ADD MDD ADD MDD ADD MDD Water User (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) Quil Ceda Village(Business Park) 0.45 1.31 0.60 1.75 0.73 2.13 0.94 2.72 4th Street Business Area 0.02 0.05 0.03 0.07 0.04 0.09 0.05 0.11 Tulalip Utilities(Residential) 0.66 1.57 0.89 2.11 1.08 2.55 1.38 3.26 Streamflow Augmentation 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Totals: 1.14 2.93 1.52 3.93 1.85 4.77 ' 2.36 6.09 2.1 Tulalip Water Pipeline Schedule Impacts Purpose: This section presents an evaluation of when the TWP needs to be completed to ensure adequate water to the Tulalip water system. The Tulalip pipeline project is divided into 8 pipe segments with numbering running from south to north. Segments 3 through 8 of the pipeline are expected to be complete by October 2013. This pipeline will be connected to the Everett water system, but will only have a maximum supply capacity of approximately 1 Mgpd. The full 36-Mgpd pipeline capacity will not be available until pipeline Segments 1 and 2 are installed. The schedule for completion of Segments 1 and 2 is not yet determined. Until Segments 1 and 2 of the pipeline are completed the total water available to the Tulalip water system is: • 3.46 Mgpd via Marysville connection(agreement expires 2020). • 1.0 Mgpd from the portion of the Tulalip Water Pipeline to be connected in October 2013. • 0.83 Mgpd from the Tulalip water wells(should the Tribe choose to operate these wells). To visually show how the water supply quantities compare to the estimated demand projections shown earlier,the above supply limits are shown with the 5-percent and 7-percent flow projections on Figure 2-4. The Tulalip Tribes 216-1598-057(01) Tulalip Water Demand Projections Compared to Water Supply 6 August 14,2013 Options