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City of Mounds View Page 4 Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 The existing trunk storm sewer in Sherwood Road will not be upsized per the recommendations in the 1989 Report. The proposed improvements identified on Map 1 in Appendix B shows that a portion of the Sherwood Road storm sewer (between Nodes 16 and 33A) will be abandoned in the future, however it will remain in operation until the new trunk connection north of Node 33A on Eastwood Road is provided. The East Detention Pond will not be constructed per the recommendations in the 1989 Report. The existing 18” storm sewer between Nodes 29 and 30A in Redoak Drive will be removed and replaced with 21” storm sewer. The 30” storm sewer between Nodes 30 and 30A in Ardan Avenue proposed in this report will not be constructed at this time, however, the permanent street improvements (subgrade improvements, concrete curb, etc.) along the north side of the Redoak Drive and Ardan Avenue intersection should not be completed with the 2009-2010 SUIP to allow for the future storm sewer crossing. 4.FLOOD PROTECTION EVALUATION FOR STREET LOW POINTS In addition to identifying the storm sewer improvements shown on Map 1 in Appendix B, we also surveyed points at each street low point in the project area to identify the low opening elevations of existing homes and garages adjacent to the street low point and the critical flow path elevation from the street low point. Based on these two elevations, the current level of flood protection provided for these structures was determined. As discussed earlier in this Report, the intent of this analysis is to confirm that the current level of flood protection to low structures will not be compromised by the improvements proposed in this Report and state why we believe that the current level of flood protection to these low structures will increase due to the proposed improvements. There are 13 street low points identified within the project area. Each of these street low points is analyzed individually in this section to address Goal 2 of this analysis, including a figure identifying the street low point location and elevation, the critical flow path elevation, and general overflow direction from the street low point. A location reference box for each figure is included on Map 1 in Appendix B.