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I I I Council Meeting Minutes October 14, 1997 Page 3 Council Business. continued Three options are proposed. Option 1 would capture remaining water at the low point catch basin at the culvert, upgrade the pipe which runs along Kari Ln., and provide discharge to Pike Lk. Option 2 would create a large ponding area requiring removal of lots on the northerly most west side of Kari Ln., and flood proofing remaining homes. Option 3 involves the removal of walkout entrances to raise low entry elevation above the anticipated flood elevation. Barr recommends Option 1 which would provide a 100- year level of protection to homes west of Kari Ln.; greatly reduce Long Lk. Rd. and 14th St./17th Ave. street flooding; prevent overflows to Kari Ln.; and does not require home relocation. Barr believes Option 2 is not feasible and more costly due to the removal of four homes in order to create the ponding area and pipe installation. Larson asked if a retaining wall could be installed along 14th St./ 16th Ave. to divert water and keep at a manageable level Jaschke said this option could be researched. Benke asked the common practice for designing storm sewer systems. Jaschke said the system should have capacity to handle a lO-year flood which is called a "level of service." The public is then afforded a "level of protection" which is a 100-year flood event which provides for the water to be taken safety away. Samuelson asked the funding strategies of these options. Proper said this area was previously special assessed for storm sewer, and the Storm Sewer Utility Fund would pay for improvements. Option 1 is the least expensive and would cost about $411 ,000. It is anticipated the County would participate in the project costs. Benke confirmed that July 11-13 rainfall was near the 50-year event measurement, and it appears the current system would accommodate a 45-year event without creating basement flooding. Future discussions should consider risk level and cost factors. A resident asked if Option 1 could jeopardize properties next to Pike Lk. Jaschke said the Rice Creek Watershed District needs to be brought into the discussion. Samuelson supports Option I, but encouraged analysis of cost factors. A resident stated that flooding occurs in this area every few years. Joan Krueger, 1594 Kari Ln., said the July 1 flooding produced 19 inches of water in the basement and damaged her home. She believes these conditions originated from the Long Lake Rd. reconstruction and Rosewood Ct. housing development. She is offended that the City wants to find the cheapest method after she lost $20,000 in irreplaceable items and paid $30,000 in repairs. Samuelson said the City is investigating alternatives to correct the situation and at the same time consider cost factors. Benke said the City is not arguing the need, but the water in the Krueger basement would be considered a 500~ year event that would have overwhelmed a 100-year system. Krueger said other rainfalls have created erosion in her yard. Mr. Ming, Kari Ln., asked for clarification of the "level of service." Jaschke said "level of service" is used for a lO-year event where runoff remains in the storm sewer and there is no flooding. Benke said the recent changes in the watershed have depleted the storage capacity which provided the IOO-year protection. Council Business Kari Ln./Long Lk. Rd. Flooding Analysis Report 97-226