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Figure 6. A CDI Radio /Control Unit Installed in the Pump House Shown in Figure 5 <br />FLOW CONTROL <br />During 2009, the first gate automation site was added to the SPDC demonstration project. <br />A lateral that serves approximately one -third of SPDC acreage, referred to as the <br />"Company Lateral ", branches off near mid -reach of the main SPDC canal. Flow entering <br />the Company Lateral is controlled by a vertical slide gate. Lateral flow is measured at a <br />flume located approximately 70 yards below the gate. The gate is automated to maintain <br />a target flow rate. CDI radio /control units were installed at both the gate and flume sites. <br />The flume unit reads the water level and calculates a flow rate every 60 seconds. The <br />gate unit calls the flume site to obtain current data and determines whether or not a gate <br />adjustment is called for at 3 minute intervals. <br />The gate was previously operated by turning a hand -wheel on a threaded rod attached to <br />the gate leaf. A chain drive system was installed to motorize the gate. The rim of a 50 <br />tooth sprocket sized for #50 roller chain is attached to the underside of the gate hand <br />wheel. A 20 rpm gear drive 12 volt DC motor with a 12 tooth sprocket is mounted to the <br />top of the gate frame. Gate position is monitored using a multi -turn potentiometer linked <br />to a gear that engages in the gate stem threads. Limit switches are installed to interrupt <br />the motor circuit as a redundant safety limit to software limits programmed into the <br />control unit. Figure 7 shows the Company Lateral Gate with motorization equipment <br />installed. <br />0 <br />` <br />nb� <br />Wer <br />w.. <br />Figure 6. A CDI Radio /Control Unit Installed in the Pump House Shown in Figure 5 <br />FLOW CONTROL <br />During 2009, the first gate automation site was added to the SPDC demonstration project. <br />A lateral that serves approximately one -third of SPDC acreage, referred to as the <br />"Company Lateral ", branches off near mid -reach of the main SPDC canal. Flow entering <br />the Company Lateral is controlled by a vertical slide gate. Lateral flow is measured at a <br />flume located approximately 70 yards below the gate. The gate is automated to maintain <br />a target flow rate. CDI radio /control units were installed at both the gate and flume sites. <br />The flume unit reads the water level and calculates a flow rate every 60 seconds. The <br />gate unit calls the flume site to obtain current data and determines whether or not a gate <br />adjustment is called for at 3 minute intervals. <br />The gate was previously operated by turning a hand -wheel on a threaded rod attached to <br />the gate leaf. A chain drive system was installed to motorize the gate. The rim of a 50 <br />tooth sprocket sized for #50 roller chain is attached to the underside of the gate hand <br />wheel. A 20 rpm gear drive 12 volt DC motor with a 12 tooth sprocket is mounted to the <br />top of the gate frame. Gate position is monitored using a multi -turn potentiometer linked <br />to a gear that engages in the gate stem threads. Limit switches are installed to interrupt <br />the motor circuit as a redundant safety limit to software limits programmed into the <br />control unit. Figure 7 shows the Company Lateral Gate with motorization equipment <br />installed. <br />0 <br />