Figure 2 shows the maximum depths of water around May St and May Circle as predicted by the 25‐year/1‐day design storm simulation under the existing conditions. This map indicates that the predicted 25‐year flood depth at the road crown is approximately 0.6 ft at May Circle and 1.3 ft at May St.  

Currently, stormwater flows from May Circle (node 591760) to Twin Lake Blvd through a 17” x 13” Elliptical Corrugated Metal Pipe (ECMP) and then north in a roadside swale before entering a 15” RCP pipe that flows east to Twin Lake.  

The runoff on May St is captured in roadside drop box inlets and routed to the east to a small lake south of Twin Lake via a combination of pipes and open ditches.  The existing systems have limited capacity to convey water to the east. Due to access easement issues and potential construction disturbance in residential lots it seems unlikely that the existing pipes and swales can be upsized through residential properties.