CSAH 82 Stormwater Analysis and Storage

Mapleton, MN | Water

Overview

ISG completed the Hydrologic/Hydraulic study for Blue Earth County Public Works on the reconstruction of CSAH 82 in Mankato, MN. The project included the reconstruction of culverts under the highway to provide drainage to approximately two thousand acres of Urban and Rural areas including Blue Earth County Ditch 12, Wilson Creek and portions of MnDOT Trunk Highway 22.


Opportunity

Working with the City of Mankato, Private Developers, and the County, a drainage system was established utilizing in-channel storage, a created wetland and a two celled/two stage pond system, the peak flows were reduced and the culverts were sized accordingly to protect the highway and the land downstream. Portions of the system were planted with native species that have thrived while further stabilizing CSAH 82 from flooding events.


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