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aGENDA SECI"ION: ne 5, ��..�� '��3��.. t�� oar�: �u 1975 ORlGINATIS�fG D�PT./DIV_: Reports and Recomrrrendatf ons Publ i c Works ITF•' NO.: ITEM DESCRIPiIflN: (i �C � j 7 Report on 4�laish Lake, Storm Drainage �aci 7 i�ies DEP7_ HEIiD APPROVQL � l� �-1 MGR. REVIEbYED/RECObAME;�iDS: Last month, a representati ve of the Ci ty of Lauderda� e inqui red to the ci ty as to the procedures on our storm v�ater pumping devices to contra7 t�e level of Wa7sh l.ake which serves bath Lauderdale and Roseville. 7he specific probiem in question �eas �he heavy rainfaTl that occurred on April 27, 1975, ��hen the lake levei rose and some Lauderda7e residences had water prablems. As the attached 7etter indicates, they are desirous of information and an investigation as to the canstruction of autamatic ��rater level cantrols. I have discussed this matter with city staff inembers and the events that occurred are as fa�lows: Late last fal7, f�SP provided the necessary electrical service to �he pumping facilitzes an tt�e narthern edge of Wa1sh Lake which serves as an overfio�r facility and can be put into operation to pump water northerly into County Road "B" �vhenever �dalsh Lake reaches unsuitable e7evations. Because of this late date however} it was not possible to fu11y test the facilities withaut disrupting the norma�.lake level and causing low water. During the last weeic of Apri i of thi s year, as many of you knat�t, we had an extr�emely hi gh 4aater table wit� the groctnd saturated fr+om the snow runoff and some precipitation. Qn Sunda.y, the 27-ih of Apri Z, a heavy rai nfal l took pl ace ►�1hi ch caused thi s problem ta become even more severe. Unfartunatley, during that sarr� r�arr�ing, lightning strucic ti�e city's storm water pumping facilities, knocking out a pump and causing the city staff cnnsiderable effort in ge tting the facilities back into proper aperating candition. Shortly thereafter, the.city sanitary sewer pumping station on Galtier near South Owassa So ulevard became overloaded and was not abie to keep up 4vith the flow it was receiving. This also caused ou� utility crew to have to �ake immediate action to avoid basements having sanitary sewage backed up into them. As soon as th�se emergencies were completed, the Utility Foreman went to the Fulham Pond pumpin� facilities and turned those on and then shortly after noon got to the Walsh Lake facilities, unlocfced the pumping operations and turned it on. At that time; the equipment operated properl_y; there were no unforseen probl�ms and it was ready for use at the time of our,forman's arrival. We are very sympath�tic w�th the p�oblems to Lauderda�e residents, as U�e17 as athers in RosevilIe t�at may have been inconvenienced by this sequence of events, but i� was most unusual and is un�ikely that it would ever occur in such a fashion ac�ain �n the future. The La�aderdale letter also inquired as to au�omatic leve7 controls, but it is our recommendat�on that in the most cr�tical tzmes, namely �n the spring runoff situation, that such cflntrols would not be effective. Past experier.ce with them at ihe somewhat simiiar Fulham pond operations has shown that these autvrnatic controls do noi function �vell, due to the freezinc�, thawing,icQ buildup, et cetera. They could be installed at the Walsh Lake facilities ati a cast in excess of $1,004, but this is not aur recorr�nendatian.