Agenda - 06-03-1991 - Laserfiche WebLink

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M totalized stream flow. This stream flow information is essential to ensure compliance with the minimum instream flow requirements. The computer was installed in the County Engineer's office in October, 1989, but the monitoring software, which had to be created specifically for the monitoring program, was not fully developed and installed until March, 1990. The second component of the proposed Eno River monitoring system consists of small dams, called weirs, constructed just below the dam of each of the three Eno reservoirs. The purpose of the weirs, which are crude yet accurate flow measuring devices, is to enable each of the reservoir operators to instantly determine the amount of flow that he is releasing from his reservoir. Knowledge of the exact quantity of flow being released is a critical factor in the overall low flow operation of the river, in that it allows operators to release just enough water to satisfy minimum instream flow requirements while retaining as much water as possible in reserve storage in the reservoirs. The weirs were originally scheduled to be constructed in the summer of 1989. it was anticipated that the summer dry season would cause very low natural instream flow in the river, allowing the necessary excavation and temporary stream diversions which would be required to construct the weirs. The dry period never occurred in 1989, and construction of the weirs was rescheduled for the summer of 1990. The anticipated dry period did occur in 1990, allowing the start of weir construction in early July. By the end of August, 1990, the two most critical weirs, those at Lakes Ben Johnson and Orange, had been substantially completed and were being used to control water releases from those reservoirs. Construction of the least critical weir at Corporation Lake was not begun in 1990 because the County staff that had been involved in the weir construction had to return to their normal jobs to catch up on their normal summer workload. Construction of the Corporation Lake weir and completion of the Ben Johnson and Lake Orange weirs are scheduled for the summer of 1991. The total budget for this project was set at $38,400, a cost figure that was developed with the assumption that all construction would be performed by independent contractors. No contractors could be located who were both willing to undertake the weir construction and had experience in the type of construction being undertaken. Consequently, all construction to date has been accomplished by County Public Works Department staff, the County Engineer, an independent grading and excavation contractor, and an independent crane operation contractor. At the present time, a total of $19,700 has been expended from the total budget. Of the funds expended, approximately $2900 are direct labor costs for County staff, excluding any labor cost for the County