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44 the Charlie Pond pipe. 45 Millwood Avenue 46 • Yard catch basins at 815 Millwood were disconnected from the storm sewer that 47 flows to Charlie Pond pipe and connected to the storm sewer that flows to Lake 48 Owasso, allowing for additional capacity in the Charlie Pond pipe. 49 • A new connection was made between the manhole in the boulevard at 820 Millwood 50 and the manhole in the boulevard of 819 Millwood. This new pipe serves as a relief 51 for high flow conditions, allowing for the low point to drain faster. 52 Avon Street 53 • The existing catch basins at 3075 and 3074 Avon were replaced with larger grates and 54 an additional catch basin was constructed at 3081 Avon to increase inlet capacity. 55 Recommended 2009 action: 56 The final recommendation from the drainage study was to purchase the vacant lot at 806 57 Brenner Avenue. City Council authorized staff to start negotiations on July 17, 2007. 58 We are continuing to work with the Reiling trust on the acquisition of this lot. 59 60 61 62 63 64 65 B. Area 2- St. Rose of Lima Area The intersection of Dellwood and Skillman Avenue, located near St. Rose of Lima Church, experiences street flooding during periods of intense precipitation. Runoff from approximately 14.5 acres of residential land use is tributary to this intersection either directly or via the storm sewer along Dellwood and Skillman Avenues. In addition, runoff from a portion of the St. Rose of Lima property is tributary via the Dellwood Avenue storm sewer, adding about 5.7 acres of mostly impervious surface. 66 An analysis of the existing trunk system indicated it can handle a 2 year rain event. As a 67 result, during intense rainfall events, the trunk system experiences surcharge, thereby 68 causing the intersection to flood to a 1.9 foot depth. 69 The CSWMP recommended a two tier solution for this street flooding problem. 70 Option 1: Construct a pond in the storm water retention on the St. Rose of Lima site. The 71 site is approximately 28% of the total tributary area, and contributes 39% of the total 72 runoff volume. Just implementing this option reduces the intersection flooding to 1.6 73 feet. Estimated cost: $148,159. 74 Option 2: Expand the pond in Mayflower Park and construct a parallel storm sewer to 75 direct runoff from the intersection to the expanded pond. This would effectively turn this 76 neighborhood park into a storm sewer retention pond. 7ust implementing this option 77 reduces the intersection flooding to 1.0 foot. Estimated cost: $549,678. 78 79 :1 . . . Options 1& 2: implementing both options would eliminate the intersection flooding. Estimated cost: $697,837. Action to date: We have not done any additional work in this problem area. Staff feels that due to impacts to the neighborhood park, any proposed solution would involve extensive public participation. City of Roseville 2008 Storm Water Annual Report Page 3 of 14