12-09-1985 Council Packet - Laserfiche WebLink

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ne -,ssary to prevent overfluw discharges. The stop lobs are removed in the cprinb as soon as ice condl Mons allow an•:A the discharge contr-1 gates are again made operational . A. Discharge SettlnEs and Adjustments The ._ischarbe settings and edjustrrter;ts betv.,een lake level elevations 928.6 and 930.0 are described es zones of control in ttie followinu pYragraphs. Zone 1 - Maximum ;;reek Carrying CaG)aci L, To effecL_vely respond to high lake levels, rapidly increasl% lake Levels ant/or chanelnE, creek ,orditions the maximum allowable di sc-ierge rate 18 requi d whenever the lake level is with the _levation range cc 929.6 to �30.0. The maxlmui-i allowable discharge rate will vary. It is def fined to be tha rate of discharge when combined with direct runoff and other inflows to the creek downstream, that will achle-we but nct exceed the carrying capacity of the creek . The carr I n6 capacity of' the creek is considered to be he maximum w that ran occur without substantial overbank flow. The maximum allowable discharge rate will be maintained as necessary until the lake level has receded below elevation 929.6. .ne - No Discharge to Maximu,:; CrEnk Carry_ng Capacity Discharges ranging frr- zero to the maximum allowable discharge rate are required in ti.is zone. When the 'ake lev• ' is below 929.1, the maximum discharge shall be no W than 30 cubic feet per second. As the l l-- level aches elevation 929.6, up to the maximum a able diecnarv^ can occur. In an extreme rasa, when high lake leve., and subsequent unrestricted discharge and flooding are predictable cue *o a,)ring sr,owrelt, the maxtmum allowable discharge rate will occur at le' a levels below elevation 929.1 to reduce '.rmenent high water .;oad_tlon.3. This diecr,arge will occur only W.en It. chi-, be 6ocumented with reas.�nable accuracy that tt. water content of the snow pack in th upper wsterared could exceed available storage ee,)acity on +.ne lake. Maximum allowable dlncthar6e rates other than those specified herein may occur only aftL r Minnesota. DNN has authorized such action. Zone 3 - 150 Ch'S to Maximum Creek Carrhl.,6 CaLaci ty In the late summer and fall, 150 c f 8 up to the maxlmLL m all —able discharge r-Ate 's r�qu,: ed when the lake level 4 of i l 1 I