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1 I 1 Council Meeti'ng Minutes M~y 12, 1992 Page 4 Public Hearing. continued Staff evaluated the option to construct a storm sewer up to the low point, about one~third the distance. Proper cannot recommend this option because the system should run up the entire drainage area to remove runoff from side streets. This option may save costs at the present time, but future flooding problems may occur. An additional lateral line is proposed behind two lots on 3rd Street bordering Silver Oaks Park to pick up backyard drainage. This line will be included in the cost estimate. When the Sky High and Oakwood systems were installed, costs were assessed to adjoining lots. During building of additional developments, construcdon of drainage systems were performed piecemeal with several laterals. Proper noted a 1984 drainage study gave a comprehensive view of the City's storm sewer system and located undersized components. Benke noted that the Oakwood system was installed in conjunction with street improvements and assessed to lots fronting the street, In retrospect, the costs could have been spread over the entire drainage area. Proper noted a letter from a resident who questioned the need for the expanded catch basin on Sky High. Another letter from a resident claimed the Sky High catch basin overflows whenever it rains. Larson asked if a capacity problem exists at the outlet, and questioned if the 1 5 inch pipe could remain and a 30 inch pipe be installed from the low point to Silver Lane. Proper said a system should be designed from the top so that water is added incrementally; in this case, the inadequate pipe size causes the system to become overloaded. Rebelein asked which lots were assessed for the 1 5 Inch pipe or other improvements and if an assessment formula allows accommodation to reflect upgrade costs. Proper said the lots below the hill paid for part of the system, but lots on the hill paid only for the short pipe to Oakwood. No adjustments were made in previous system enhancements or replacement projects. Roger Westlund, 1823 Sky High, presented a petition protesting the assessment and requesting reduction of certain assessments which the city would absorb the difference. He feels the developer should have increased the pipe from 3rd St. to Silver Lake Road, and suggested establishment of a City-wide utility charge for replacement and repairs of storm sewers. Benke said it appears the developer responsibly handled the drainage on that parcel. When water falls on top of a hill and flows downward, the ow'ners on the hill are responsible for solving the problems of down hill lots receiving this runoff. He said a City utility charge could create inequities between residents who previously paid for improvements. Bill Lloyd, 1901 Sky High, has not seen the catch basins overflow and feels they are full of debris and should be cleaned. Benke said the catch basin improvement is a small part of the total project cost, the assessment majority pertains to the improvements further on Oakwood, Public Hearing Storm Sewer Improvement Oakwood Drive/Silver lane IP-92-2 Report 92-108