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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Potable Water Back-up <br /> <br />In secondary supply systems, potable water supply is often provided as a back-up to the <br />raw water supply. If water from the pressurized secondary system is desired before <br />surface water rights are available or after the ditch is "shut off' for the season (often <br />referred to as the "shoulder months"), an alternative water source is required. It is often <br />not economically feasible to provide potable back-up for all customers in the service <br />area, but it may be desirable to provide this option for some landscapes such as <br />community parks, high use zones such as ball fields, or for more valuable landscapes <br />such as trees and shrubs. <br /> <br />A potable back-up system would make use of the same storage reservoirs, pump <br />stations, and transmission system as the secondary supply system, with no change to <br />the end user. Alternatively, a potable water tap could be connected to an isolated <br />irrigation system through a backflow prevention assembly (to prevent cross- <br />contamination). Physical isolation and a spool piece in the system would most likely be <br />required prior to connecting to a potable source. <br /> <br />Agreements with potable water purveyors are needed to allow for this type of backup <br />service. <br /> <br />Aqua Engineering, Inc. <br />November 8, 2004 <br /> <br />Canal Modernization Feasibility Study <br />- 13 - <br /> <br />