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I I I I I I I I I I I I I I I I I I I fipe Network Components and Eqy!pment Network Hydraulic Model A total flow rate of approximately 60,000 GPM is required to serve the irrigated acreage within the proposed secondary supply service area. The proposed pressurized system will include the existing Highland NO.3 Reservoir and a new reservoir in Phase II, two new vertical turbine pump stations, two booster pump stations in Phase IV, and a network of PVC pipelines and fittings. A hydraulic model was developed to determine the optimum pipe sizing based on the developed pipe routing and existing and proposed reservoir locations. The conceptualized pipe routing follows the existing Highland Ditch canals, laterals, and rights-of-way. Additionally, other existing canals or laterals were used where possible or logical, such as the McKay and Bunyan Laterals. New railroad, highway, and road crossings should be minimized by using existing laterals where possible, After the pipe routing was determined, anticipated flow demands in the system were assigned to nodes on the pipe network. These demands were assigned based on the irrigated area within the boundary of each Phase. Demands were equally distributed from adjacent pipes. Both pump stations contribute to the total flow rate for the pressurized irrigation system. It is assumed that both proposed pump stations operate simultaneously. Each station will include some redundancy to allow for maintenance of the pumps and motors without disrupting the service flow rate. However, if an entire station is taken out of service, the remaining station will not be able to provide the total peak day demand. The hydraulic model was used to determine the actual flow rate required from each pump station, which is a function of elevation and discharge pressure at each of the stations. Due to the nature of the service area layout and elevation changes, both the Phase I and the Phase II pump stations have approximately the same flow and pressure requirements. Intake System An intake screen constructed of expanded metal will be located in the storage reservoirs and will help prevent large debris from entering the pump system. A concrete intake structure will connect the intake screen to a concrete wet well located below the pump system and building. Isolation will be provided during maintenance and cleaning of the wet well. Pump Skid Each pump station will include multiple pumps to provide a range of required flow rates from incidental watering needs to the peak day demand. The pump systems will consist of multiple vertical turbine pumps capable of supplying the required peak season flow rate at the set pressure. The smaller pumps will be installed to keep the distribution Aqua Engineering, Inc. November 8, 2004 Canal Modernization Feasibility Study - 22-