The design solution increased the outfall storm sewer capacity in the flood vulnerable area southeast and southwest of the I-35 and I-94 Interchange.
NE Penn Drainage Area Improvements
City of Bloomington, Minnesota
The City of Bloomington experienced areas of flood vulnerability southeast and southwest of the I-35 and I-94 Interchange. During extreme rainfall events, runoff overwhelmed the existing storm sewer pipe capacity and was stored above ground until the existing pipe system could attenuate the flow. Because the area was fully developed, there was limited safe storage before flood damage occurred. Further, open space for excavating a stormwater detention basin was limited. Office and field survey tasks were performed to produce a consolidated map of property, easements, and existing conditions. Prior to finalizing design, Bolton & Menk evaluated the preliminary XPSWMM modeling previously developed. After a thorough analysis, multiple model corrections were made but no significant design changes were necessary. A design solution that increased the outfall storm sewer capacity was finalized. Additionally, Bolton & Menk created a project communication website detailing the scope, schedule, and updates of the project.