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City of Mounds View Page 1 Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 CITY OF MOUNDS VIEW Ardan Avenue Drainage Subdistrict Report 1.BACKGROUND The Ardan Avenue Drainage Subdistrict Report dated March 30, 1989 (“1989 Report”) was prepared for the City as a follow-up to previous reports that identified stormwater improvements aimed at addressing drainage problems identified within the Ardan Avenue Drainage Subdistrict. The main purpose of the 1989 Report was …to insure that the Long Lake Road storm sewer has adequate capacity to serve the Ardan Avenue Drainage Subdistrict1, as Long Lake Road was scheduled to be reconstructed in 1991. More broadly, the 1989 Report sought to characterize known flooding problems, develop feasible solutions to these problems, estimate costs for the proposed improvements, and address other related issues within the Ardan Avenue Drainage Subdistrict. A copy of the 1989 Report is included in Appendix A. The 1989 Report outlined a number of stormwater improvements in the study area between Ardan Avenue and Sherwood Road, and between Knollwood Drive and Long Lake Road to address the known drainage issues in this area. Figures 1-3 in the 1989 Report identify the extents of the study area and the recommended stormwater improvements proposed in the 1989 Report. It should be noted that the stormwater improvements identified in the 1989 Report are not entirely consistent with the recommended improvements from previous reports addressing drainage issues in the study area. The 1989 Report includes a brief discussion regarding why certain stormwater improvements identified prior to the 1989 Report were no longer recommended. Based on the storm sewer design recommendations in the 1989 Report, the utility improvements associated with the reconstruction of Long Lake Road include the recommended 48-inch Reinforced Concrete Pipe (RCP) stub at the intersection of Long Lake Road and Ardan Avenue. This 48-inch stub was installed to connect to the large diameter trunk storm sewer proposed in Ardan Avenue, per the recommendation of the 1989 Report (see Figure 3 in Appendix A). 2.INTRODUCTION We have performed an initial review of the 1989 Report and essentially confirmed its findings. However, it appears that the stormwater improvements proposed in the 1989 Report may not be warranted to the level being proposed based on the perception of long-time City Staff and residents living in the study area. City Staff recall receiving complaints from residents in this area regarding rear yard nuisance flooding on properties north of Ardan Avenue following heavy rains, however, the improvements proposed in the 1989 Report appear to go well beyond what is necessary to address these rear yard nuisance flooding issues. Other concerns were noted with the 1989 Report as well. The Study assumed that the East Detention Pond (see Figure 3 in Appendix A) would be constructed by a developer. However, under present conditions the City would need to acquire land and construct the pond. This pond cost coupled with cost of storm sewer improvements identified in the 1989 Report represent a significant cost to the City (see Section 6 in this report for cost estimate information). In addition, the 1989 Report improvements would be physically challenging. The proposed pipes are large diameter, and given the existing topography would be extremely shallow, especially on Sherwood Road. It would be very difficult, and perhaps not even possible, to construct the proposed trunk storm sewer as recommended in the 1989 Report. 11989 Ardan Avenue Drainage Subdistrict Report – Page 1