A study by a regional planning commission has determined that the Foxconn project will not have a serious impact on stormwater runoff into area rivers and streams.

The Southeastern Wisconsin Regional Planning Commission released its floodplain evaluation of the proposed Village of Mount Pleasant Electronic and Information Technology Manufacturing Zone and associated roadway expansion that is located within the Pike River watershed.

The report found that the proposed stormwater controls for the area, based on existing stormwater ordinances, will widely protect downstream rivers and land from increased flooding.

“We thank SEWRPC for its diligence in this analysis,” said Kenosha County Executive Jim Kreuser. “We will continue to work cooperatively with SEWRPC, the village of Mount Pleasant and Racine County to address stormwater concerns, remedy stormwater issues that arise, and protect land in Kenosha County and beyond.”

“We applaud the work of the village of Mount Pleasant and Foxconn in developing an effective stormwater control plan that ensures the health of our waterways and protects downstream land,” said Racine County Executive Jonathan Delagrave. “This report reinforces SEWRPC’s findings from June 2018, when it determined that stormwater control plans also effectively reduced flooding risk in the Des Plaines watershed.”

Through hydrologic modeling, SEWRPC tested the ability of the proposed stormwater facilities to control runoff from the anticipated increased level of development.

The study demonstrated that the stormwater controls will be effective at maintaining or reducing downstream flood flows.

Within the Pike River watershed, the study included four tributaries to either the Pike River or the South Branch Pike River (Pike Creek): Chicory Creek, Lamparek Ditch and Waxdale Creek, located in Racine County, and School Tributary in Kenosha County.

One area of concern

The study found only one area of potential concern — Waxdale Creek in Sturtevant, where flood discharge could increase as much as 21 percent. Affecting this area is a stormwater detention basin in the Renaissance Industrial Park.

The study concluded that while the basin “limits the peak discharge from future development, it does not reduce the expected increase in actual runoff volume. As such, the model results show that this increased runoff volume will eventually move downstream where it will contribute to the amount of water detained in the stormwater pond within the Renaissance Industrial Park. That volume increase translates to an increase in discharge from the Renaissance basin”

However, the study concluded that the “increase in flood discharge along Waxdale Creek is quickly assimilated as one moves downstream, with no increase anticipated downstream of the confluence with the Unnamed Tributary to Waxdale Creek, about 0.4 mile downstream of the Canadian Pacific Railway.”

“The analysis described herein demonstrates that, with one small exception, application of the stormwater control requirements set forth in the ... ordinance is sufficient to address increased runoff rates and volumes from development of that portion of the EITM zone within the Pike River watershed with no significant increase anticipated in downstream flood flows.”

In regards to the Waxdale Creek area, study said, “While the impact on flood discharge is limited to a relatively short reach of Waxdale Creek, consideration should be given to employing measures with the EITM development that would address not only increases in peak discharge, but also increases in runoff volume.”

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