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1 I I Council Meeting Minutes May 12, 1992 Page 7 Council Business Proper said Council ordered a feasibility report to identify short and long term solutions for the stormwater problem at 7th St. and Oakwood Drive. At least two homes on Oakwood Drive have a long history of flooding due to overloading of the existing storm sewer system on Oakwood and Emerald. The proposed Fairfield Drive subdivision and the Christ the King Church addition brought the problem to the forefront. The 7th St. system contains a 36 inch pipe from Co. Ditch 2 and runs into a 30 inch pipe stopping at intersection of 19th Ave. and Oakwood. The 30 inch pipe is adequately sized, but problems occur when runoff on 7th St. is flowing fast. The 6 large catch basins cannot intercept the runoff fast enough and then causes the water to drain into the Oakwood system. The Oakwood/Emerald System consists of a 12 inch line running from the backyards on the westside of Oakwood. It drains to a 15 inch pipe which runs north of Patton Road and Emerald Circle into the Polynesian Village pond. This system is substantially undersized and would still have problems even if the 7th St. system was overbuilt and water intercepted. The 9th Street System consists of a 24 inch pipe with double catch basins which run across Patton Road into the Polynesian Village pond. This system has adequate capacity for a 10 year event. The final area consists of Bel Air School, 23rd Avenue, and 22nd Avenue which drains into the 10th Street System. This system has large capacity catch basins which drain into the '~694 drainage system. Proper said catch basins are installed to provide more capacity during periodic flooding. He noted that the 9th St. system's double catch basins are designed properly, and the 10th St. catch basins do not plug easily. The area east of 23rd Ave. drains to the 7th St. System and into a culvert which runs down into the low area on the end of Fairfield. All 18.4 acres around Fairfield drain into that culvert. Due to the large capacity of the low land, there has never been outflow from this area. The Fairfield development and pond would increase the water running down 7th St. The overall effect of both the Fairfield and Church projects will not increase or decrease the problem. However, the Church property ponds should improve the situation by holding water and releasing it at a lesser rate. In October 1975, staff presented an improvement project for the 7th St. storm sewer from Silver Lake Rd to Co, Ditch 2. The report identified the problems of the overloading Oakwood/Emerald system by 7th St, water and the back water valve preventing the backyards on Oakwood from draining when Oakwood floods, Staff recommended installation of the 7th St. system from Silver Lake Road to Co. Ditch 2. at an estimated cost of $135,183.60, $2,503.40 per acre. An alternative recommendation consisted of only that portion of the storm sewer between 19th Ave, and Co. Ditch 2, at an estimated cost of $72,124, $1,335.63 per acre. Council Business Report on Drainage Problem in the 7th St, NW Area, Report 92-110