4.3. ERMUSR 06-16-2015 - Laserfiche WebLink

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3 eEf I :S P o If the reservoir water surface elevation rises to , i B77.O feet, maintain Gate No. 3 full open and open 1 Gates Nos. 1 and 2 to the full. open position. o If the reservoir water surface` lowers to elevation 871,, 3 (crest of the overflow weir) at any -time during ;# opening of the gates, then begin closing the gates. Close only one gate at a time. Close date No 3• first, followed by Gate No. 1, and finally I i Gate No, 2. Close. the second and third gates only 1 after the previous gate has been closed completely ��s and the reservoir water surface is at or below 8i.3 feet and continuing to drop. Never stop the gates when water is flowin3 over- the toy and under the bottom at the same time. Whin open, the top of the gate should be wWII. above the reservoir water surface - elevat .on. ' If water flows both over and under the gate at the same time for a prolonged period, vibration may damage the gate. IMPENDING DAM FAILURE `I f In the event that severe damage occurs to the dam for whatever reason, and sudden or impending failure is suspected, the damtender should immediately contact the Elk River Police I Department (phone 444 .2323} . 3 . The police department should in turn contact the following : agencies and immediately coordinate efforts with these agencies to warn residents and, if necessary, to evacuate areas in the downstream flood plain. s , o Minnesota Department of Natural Resources, Division $ ;s of Waters . f i o Sheriff's Office - o State Police { o , City Hall If possible, open all radial gates and drain the reservoir. i Clear the downstream area to the Mississippi of all people :1 before opening the gates, because the downstream river level # may rise several feet when the gates are openep., Contact a qualified engineer and advise of existing conditions. :•. :i 2-3 'i 204