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1 I 1 Council Meeting Minutes April 28. 1992 Page 3 Council Business. continued Currently, storm water generates north of the church from its east portion, and runs through backyards located east on Oakwood Drive. The stormwater enters a catch basin in the backyards and flows into the Oakwood storm sewer system. Stormwater from the north parking lot is directed to a retention pond on the northwest corner which overflows to 7th Street through a stormwater pipe in the church parking lot. Contributing to the Oakwood flooding problem is the recent bituminous overlay which reduced the 7th Street catch basins' capacity to 40%. As a result, the stormwater from 7th Street runs down Oakwood and overloads the Oakwood storm sewer system causing a backwater valve to hold stormwater in the backyards of homes on Oakwood. The plan increases the existing northwest holding pond's depth to allow for increased volume. The new gymnasium would be equipped with roof drains tied directly into a 12 inch underground pipe carrying storm water into the northwest pond. The northwest pond would release storm water onto 7th Street through an 8 inch storm pipe equipped with a 4 inch orifice which decreases the rate of outflow from 16,6 cubic feet per second (CFSI to 0.88 CFS. The northwest pond's larger volume of water will be released at a slower rate and the amount of time to drain will be greater. Ramsey County Public Works has indicated a willingness to restore the catch basins on 7th Street to 100% capacity. The plan allows for the addition with no storm water discharge quantity increase to the east of Oakwood. In addition, the storm water rate flowing from the church to the east and south will be decreased. The catch basin restoration will divert 7th Street storm water away from Oakwood and allow the storm sewer backwater valve to remain open and permit flow from the northeast pond and backyards to enter the Oakwood system. Gunderman asked if the catch basins were enlarged. would the pipe be large enough to handle the storm water. Proper will investigate this. Eventually a storm sewer pipe needs to be installed on 7th Street from 19th Avenue to Silver Lake Road, Until a storm sewer is completed. the church ponds and the 7th Street water basin repairs would stabilize any stormwater problems in the immediate area and allow construction. Gunderman asked if Oakwood may be raised to prevent drainage problems. Mattila said the area needs to be evaluated to determine effectiveness of a berm. Gunderman verified there are two drainage systems in the area. Benke asked if the pipe near the 7th Street catch basins runs to the creek or turns left and down Oakwood. City Engineer Les Proper said there is a 30 inch storm sewer on the southside of 7th Street that runs from the low point near Polynesian Village to 19th Street. There are catch basins on the north and south sides of 7th Street. He is unaware if the pipes have enough capacity to handle more than the catch basins presently there, but the 30 inch pipe comes right up into the intersection. Council Business Christ the King Addition Report 92-097 Resolution 92-043