East Lansing outlines stormwater data and resiliency study after localized floods
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Summary
City staff reported heavy rainfall measurements and peak flows at pump stations following an April storm; the city urged short‑term homeowner steps and said a wet‑weather resiliency study will guide long‑term infrastructure investments.
City staff told the council on April 7 that a recent intense rain event exceeded the design capacity of parts of East Lansing’s drainage system and produced localized basement and street flooding.
In the city manager’s report, staff said the city’s water‑resource recovery facility rain gauge recorded 3.34 inches of rain during the storm, with about 1.73 inches falling in one hour during the heaviest period. At the Woodingham Pump Station staff reported peak flows well above typical rates and rapid filling of combined sewer channels, with portions of systems filling in just 12 minutes. The Wilmarth Drain briefly crested and discharged to the Red Cedar River.
City staff said regional high river levels (Red Cedar and Looking Glass Rivers) limited the city’s ability to discharge flow and contributed to localized backups. The city manager described a wet‑weather resiliency study — a climate‑informed hydraulic model — that staff will use to prioritize infrastructure investments and identify recurring flood locations. Staff encouraged residents to extend downspouts, test sump pumps, review grading, and consider backflow prevention valves, and pointed to an assistance program through public works and the website eastlansingfloodstudy.com for more information.
Council members and staff acknowledged the long‑term infrastructure fixes will be expensive and take time; the city manager estimated the larger infrastructure problem could be "on the order of hundreds of millions of dollars" and said smaller, project‑level runoff improvements are already being required in new approvals to reduce post‑development runoff.
