Agenda - 04-18-1989 - Laserfiche WebLink

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. . - . . . . . 5 Mr. Link Page 2 December 12, 1988 accomplished by opening sluice gates contained in outlet or outlet/pumping station structures. There are no metering or measuring devices associated with the gate assemblies. The lack of control accuracy at the three impoundments and the lack ©f an instantly accessible totalized flow measurement at the monitoring station isincompatible with the goal of both maintaining a minimum flow in the Eno and conserving water in the impoundments. Even without adequate metering, it would be easy to maintain a minimum stream flow, . . but this would likely mean maintaining a flow in excess of the minimum required and would be at the expense of conserving water in the impoundments. It would also be easy to conserve the maximum amount of water in the impoundments - but this would entail spotty conformance with the minimum stream flow requirements. The present system of monitoring and releasing impounded water in the Eno renders impossible the simultaneous goals of maintaining minimum stream flow and . conserving water. There are other variables in the operation of the Eno system which adversely affect the monitoring operation. Loses of .. flow in route between reservoirs complicate calculation of the quantity of water which should be released. These loses , .. occur due to the evaporation or groUnd absorption of water and due to the filling of pools and low areas in the stream beds between impoundments. Irregular withdraws of water in Corporation Lake and Lake Ben Johnston can also complicate , adequate flow monitoring in the Eno system. , q If one could assume that the cost of construction and . . I , equipment was no problem and that there would be no ., ob5ection to who was in charge of the control of the 1 q, monitoring and release of water from each portion of the system, the Solution of the monitoring of Eno would be no I 1 . real problem. The flow would be monitored at the existing' , DSGS station with continuous and totalized flow measurement and each impoundment would have continuous and totalized flow • qr monitoring on the upstream and downstream ends and an i automated release system. Each impoundment's flow monitoring .- .:: .1. system and the USGS monitoring station would have a telemetry , - system Which would allow all monitoring and flow control , operations to the handled from a centralized location. This 1 . centralized location would allow total system control by a single operator or ideally by a microprocessor system. . . . . . , . There are alternatives to this type of control system. If a i 1 good deal of coordination can be achieved among the three [ , . H , . ..