Agenda - Council - 10/22/1979 - Laserfiche WebLink

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H KANgON NDERSON ASSOCIA TE$ Inc. P.O. Box 665 2665 4th Avenue North professional engineers and surveyors Anoka, Minnesota 55303 October 11, 1979 Mr. Lloyd G. Schnelle City Administrator City of Ramsey 15153 Nowthen Boulevard N.W. Anoka, Minnesota 55303 Re: Flintwood 2nd Addition Storm Water Drainage Dear Sir: In answer to your certified letter of September 26, 1979 to our client, Mr. Norman Holm, on the subject of storm water drainage in the Flintwood Hills Additions, we offer in the following a plan for consideration. Our letter to Mr. Paul Ruud, County Engineer, on August 2, 1979, outlined the existing conditions and offered several alternative methods to reach a solution. One of these methods suggested that the City of~Ramsey assume the responsibility of the storm water drainage in the watershed of County Ditch 43. As you stated in your letter, that option is not legally practical. We, therefore, proposed the following for consideration to both the City of Ramsey and Anoka County: 1) That storm water drainage system shown on the Grading & Drainage Plan (revised 9/6/79 and 10/10/79) be designated as a realigned County Ditch 43, 2) That present location of the County Ditch 43 within the Flintwood Hills Plat be abandoned and relocated to the route noted above. Please review the route location on the attached drawing. The relocation would be accomplished by routing the County Ditch #43 onto the proposad storm drainage facilities shown for Flintwood 2nd Addition. The facilities would include ditch, storm sewer and retention ponds. Several facts are significant in the design of these facilities, especially the storm sewer system, ponding and inlet control. The storm sewer pipe capacity is designed on a 10 year frequency storm and · intended to serve the runoff from the plat only. The storm water retentto~ ponds are designed to retain 4 inches of runoff from the plat only. The i7 civil * municipal · planning · soils · /and su/ ,/]/)# . /~ ~ , ~ ~ ,