Tulalip Tribes 11/9/2016 - Laserfiche WebLink

• TECHNICAL MEMORANDUM (CONTINUED) Water Meter Locations: The Tribal water use data included water meter readings from 45 water meters throughout the water system. These meters were clustered into 3 main areas: Tulalip Utility (TU), Quil Ceda Village (QCV), and Quil Ceda Casino and 4th Street area (QCC). The Tulalip Utility usage is recorded at the following water meters: Aspen/Olympic, 27th Street, and 19th Street water meters. The QCV water usage is measured at several meters including Outlet Mall, Tulalip Resort/Casino, Home Depot, Olive Garden, Wal-Mart, and Cabela's.The Quil Ceda Creek Casino flow is recorded at the 4th Street water meter. With the exception of the QCC water meter, all the Tulalip water supply flows through the City of Marysville mastermeter at 88th Street. To best represent water demand and include any leakage upstream of the Tulalip Utility and QCV water meters,the City's 88th Street meter readings were used for TU and QCV flow evaluation and projections. Existing Water Usage Purpose: This section describes how existing water data was trended and evaluated to set a baseline flow for making future projection decisions. The information below describes the process used to trend water use data. Water flow measurements from Marysville's 88th Street flow meter and Tribal water customer meter readings were used to determine water demand for the last 3 to 5 years. Average day demand and maximum day demand are two important design values that were calculated and evaluated. ADD is used to estimate long-term demand. MDD is used for designing pipelines,pumps,and equipment and establishing water supply requirements. Daily 88th Street meter readings from 2010, 2011,and 2012 were trended and shown in Figure 2-1.As expected, the peak water usage occurs during the irrigation months of July and August. Please note that flow through the 88th Street meter may be restricted. A flow control valve, at this meter, is programmed to provide a steady 24-hour flow and clip peak flows. Therefore, the maximum daily readings may not reflect actual peak demand. When flows greater than 3.46 mgd are required, storage volume in the Tribal water reservoirs is utilized to provide these flows and is not reflected in the 88th Street daily meter readings. Because the 88th Street flow is flow regulated,actual peak demand was estimated using standard peaking factors. The 2009 Washington State Department of Health Water System Design Manual(Section 5.2.1)recommends that the maximum 30-day average flow (maximum monthly average day demand [MMAD]) be multiplied by 1.7 to estimate MDD. Conclusion:The average Tulalip water demand for 2012(88th Street meter plus QCC meter)was 1.08 Mgpd.The estimated MDD was 2.79 Mgpd.These values became the starting point for making future projections. Future Flow Projections Purpose: This section describes the process used to provide a range of future Tulalip water demand estimates. Existing water usage data provided a starting point for making future projections. When projecting future use,we had to consider what could affect future water demand.Below is a list of criteria used to establish future water use projections to the year 2028: • The Snohomish County population projections estimate a 1.7 percent growth for the next 12 years. • Water usage increased steeply over the 2010 to 2012 period based on Marysville's 88th Street meter recordings. • Water usage from 2007 to 2012 increased approximately 4 percent,based on the TU and QCV meters. • Based on the conclusions included in the 2008 memo, the use of drinking water for Streamflow Augmentation was not included for short-term demand. The Tulalip Tribes 216-1598-057(01) Tulalip Water Demand Projections Compared to Water Supply 3 August 14,2013 Options