CC PACKET 03061996 - Laserfiche WebLink

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i • 8300 Norman Center Dave 555 West 271h Street Barr Minneapolis,MN 55437-1026 Hibbing,MN 55746 Phone:(612)832-2600 Phone:(218)262-3465 Engineering Company Fax: (612)832-2601 Fax: (218)262-3460 MEMORANDUM To: Michael Mornson City of St. Anthony Village From: Denny Palmer Subject: Drainage District 6 Date: February 26, 1996 Project: 23/27-467 DEP 102 This memo will summarize the key points of Barr's July 19, 1992 Stormwater Management Analysis District 6 Drainage Basin for council review. I will attend the March 6 council work session beginning at 7:00 p.m. to answer questions that the council may have regarding drainage improvements in District 6. • In 1991, St. Anthony engaged Barr to do an analysis of drainage problems in the city's drainage District 6. Barr first prepared a computer model which simulated existing conditions of flooding for an intense rainstorm whose probability of occurrence in any year was 1 percent. Alternative scenarios of ponding, upgraded pipe capacity, diversion, and combinations of these alternatives were considered to see how the flooding problem might best be relieved. On the basis of our analysis, we were able to draw the following conclusions: 1. The flooding within District 6 is caused by storm sewers with inadequate capacity. Today's standards for the construction of storm sewers call for additional capacity from low areas for which there is no overland outlet. The existing systems were not provided with this additional capacity. 2. To increase the capacity of the local storm sewers within District 6 would simply move the flooding problem downstream to Kenzie Terrace and County Highway 88 because the capacity of the County Road 88 storm sewer is not adequate to handle the increased flows which would result from an improved storm sewer system within drainage District 6. • 2327467\35075-1/KMH