Tulalip Tribes 11/9/2016 - Laserfiche WebLink

TECHNICAL MEMORANDUM (CONTINUED) Table 1-1. 2008 Estimated Water Demands Medium Water Demand Usage Existing 6-Year Forecast 10-Year Forecast 15-Year Forecast (2007) (2013) (2017) (2022) ADD MDD ADD MDD ADD MDD ADD MDD Water User (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) (mgd) Quil Cede Village(Business Park) 0.27 0.78 0.67 1.86 0.93 2.53 1.26 3.31 4th Street Business Area 0.05 0.15 0.22 0.62 0.30 0.81 0.30 0.78 Tulalip Utilities(Residential) 0.57 1.65 0.80 2.25 0.98 2.67 1.23 3.24 Golf Course 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Streamflow Augmentations 0.00 0.00 0.00 0.00 0.00 0.00 0.40 2.00 Totals: 0.89 2.58 1.69 4.73 2.21 6.01 ' 3.19 9.34 a Table values revised to 0 for this 2013 memorandum. 1.2 Conclusions from 2008 Memo The 2008 memo concluded that based upon revised 2008 water demands,Everett's MDD supply limit of 36 mgd is a reasonable design criteria for the water transmission main. Possible exceptions to these water demand projections would be considered by The Tribes to: • Satisfy a portion of the anticipated 36-mgd water demand with water from the current Joint Operational Agreement(JOA)at approximately 3.5 mgd,assuming the agreement can be extended beyond 2020. • Minimize anticipated stream flow augmentation by use of other water sources such as reclaimed water, different stormwater management approaches, or by storing wet weather surface water flows using aquifer storage and recovery. • To serve other agencies outside of the Reservation boundary with water supply from the Tulalip Water Pipeline. 2.0 WATER SHORT-TERM DEMAND FORECAST-2013 The purpose of revisiting The Tribes short-term water demand forecast is to ensure that the future water supply system is adequate and to determine when the Tulalip Water Pipeline must be constructed. The steps used to perform this evaluation were to: 1. Evaluate water use over the past 3 to 5 years. 2. Evaluate population growth and planned development. 3. Estimate water demand for 6, 10, and 15 years in the future. 4. Evaluate the water system facilities needed to deliver future water demand. The first step in making estimates of future water demand was to compile and evaluate recent water usage data. Recent water use data was collected from the City of Marysville and the Tulalip Tribe. The Tulalip Tribes 216-1598-057(01) Tulalip Water Demand Projections Compared to Water Supply 2 August 14,2013 Options