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Shorewood officials look to reduce infiltration of stormwater into system

Options include manhole cover rehab, sewer linings

April 18, 2012

Shorewood - Village officials this week received findings on an inflow and infiltration study that has been conducted in one of two areas hit hard in the July 2010 rain storms.

Throughout the discussion of stormwater and sewer improvements, village officials have been working toward an I&I program - an initiative designed to reduce the likelihood of rain water getting into sanitary sewers during heavy rainfall events. When such an instance occurs, sanitary sewers become overwhelmed and cause basement backups.

At Monday's meeting, village staff discussed the status of I&I within Basin 1. Village staff are working with outside firms on the area, which calls on reconstructing Olive Street from Newhall Street, through Wilson Drive. Also, Newhall Street is scheduled to be trenched and patched.

Phil Bzdusek of engineering firm Strand Associates presented findings from the I&I study. Based on the firm's analysis, Bzdusek said Basin 1 has a history of wet weather flows that exceed allowable limits.

The firm performed a detailed analysis of water flow in the area on three occasions during heavy rainfall in 2011. Rainfalls over a 24-hour period during the three days ranged from 1.71 to 2.77 inches. One-hour peak rainfall ranged from 0.38 to 1.61 inches.

During the three rainfall events, Bzdusek said ground conditions were saturated.

Strand also performed a process known as flow metering, and the presence of I&I was discovered during the analysis.

In an effort to alleviate I&I, Strand is recommending a number of initiatives, including manhole rehabilitation, sewer lining improvements and a process involving smoke testing to determine where leaks are prevalent.

- Dave Fidlin

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