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��� <br />MNEERS N ARCN17KTS 9 PLANNERS <br />MEMORANDUM <br />222EAST LIIILEMM4 ROAD, S[ PAU4 MINNESON 55117 612484-0277 �'�'\6�71b 191 <br />TO: <br />CITY OF MOUNDS VIEW <br />Y <br />v N,p pill pf Q <br />DON PAULEY <br />�dJ y�F�y <br />FROM: <br />DAN BOXRUD <br />9st•EZt��• <br />DATE: <br />AUGUST 17, 1987 <br />SUBJECT: <br />ARDAN DRAINAGE SYSTEM <br />SEH FILE: 87154 <br />r- <br />This memorandum is in response to our meeking in Lhe rear yards <br />of the homes on the north side of Arden Avenue west of Red Oak <br />Orive. The topic you, Steve Rose, and I reviewed war, that of <br />reinstallation of a manhole section on the storm sewer manhole <br />which previously had,6' high manhole section on it stove grade. <br />The purpuse of the manhole section was to restrain the back flow <br />of, stow. watav from spilling into the backy&rd areas and <br />potentially flooding homes. The structure had been removed for <br />various reasons and a new structure is no -a being proposed for (�, <br />reinstallation. w.� <br />It is my understanding that the previous structure adequately <br />restrained the backed up storm water from flooding the backyards <br />while the small hole in the bottom of the structure allowed the <br />backyards to drain down after the storm. With this <br />understanding, I have no problem with reinstalling a structure on <br />this manhole. <br />I understand the proposal to be to install a 4' manhole cone on <br />the existing short manhole section. The existing small hole in <br />the bottom section will continue to be used for slowly draining <br />down the area after a storm. The proposal to put a flap gate on <br />the inside of the manhole over the small hole to `.urther restrict <br />backflow into the yards as the water heads up in the manhole <br />seems to be reasonable. This "check valve" concept has been used <br />elsewhere with some success, most notably in a backyard along <br />Woodcrest Drive. It will be necessary to monitor the <br />installation to make cure that sticks and other debris do not <br />plug the small hole or restrict the operation of the flap gate. <br />DRB:jms <br />SNORT Fm017 51 PAUI, CHIPPFIVAFAuj <br />HENDRICKSON INC. MINNESMA WISCONSIN <br />