12-09-1985 Council Packet - Laserfiche WebLink

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( SEC' 10N 1 _ MAt2AGE:MLN`1' PULICY It is the policy of tree Ulstrlct to operate the headwaters Control Structure to reduce flooding both on Minnehaha Creek and Lake Minnetonka. This is accomplished by controlling the discharge from Lake Minnetonka to Minnehaha Creek after ice -out (approximately April 15) until approxini-tC,y mid -June. As a result, wfiter is temporarily stored on the lake. After approximately rind -June: water stored on Lake Minnetonka is released, to the greatest extent possitle, at a controlled uni"orm rate during the bummer and Tall. Such controlled discharges continue until adequate storage capacity is provided on the laze for a normal spring snowmelt. After the open water season discharges to the creek are prevented, whenever possible, to reduce ice con trictions in the creek ci,annel. SECTION II. MANAGEMENT GOALS Numerous considerations must be taken into account when discharging water through the headwaters Control Structure. Trie Board of Managers realize that sound judgement based upon operational experience is an essential part of the operating plan to insur,2 intelligent use of the water available to Lake Minnetr nka and Minnehaha Creek. It is therci'ore the intent of tt.e Board of Managers to use discretion when operating the structure. i1ie Management Goals are : 1. To reduce downstream floodin- I controlling the discharge to Minnehaha Creek to a rate not exceeding, the maximum carrying capacity of the creek whenever the L.-%Ae— Mlnnetonka water level, is within the physical limits o: contr-)l . ?. To reduce flooding on the lake by stabilizing, lake levels between the elevation of the low point on the previous faxed weir and the Ordinary High Water level (U11w). 3. To reduce flooding, on the lake and downstream, by temporarily increasing discharge rates to accommodate preilctable and large volumes of runoYT into Lake Minnetonka prlur to the time such runuff occurs. 4. To provide discharges, during and/or 1'ollowl116 dry perle,dm, comparable to discharges that occurred historically under .imi lar lake level conditions such that the d• trimental ePiacta of creek flow stagnation are not ai,gravated as a result L.f operating procedures. 5. 1e -entrance recreation, wildlife and aquatic .ii e Sur-vival, ana aesthetics, when feasible and cons' ,tent witn the Management Policy, by augmentation of creek flew ttiond the time discharges Irom Lake Minnetonka have histories' ly ceased. l 2 of' 11