Milwaukee Metropolitan Sewerage District
Press Release

Storm Update – June 18 & 19, 2018

This is the first tunnel related overflow since September of 2016.

By - Jun 22nd, 2018 03:37 pm
Overflow Volumes

Overflow Volumes

(Milwaukee, WI) – The Milwaukee Metropolitan Sewerage District (MMSD) is reporting the following information to the Wisconsin Department of Natural Resources regarding sewer overflows that resulted from heavy rain June 18 and 19, 2018.

In just under two hours, intense rainfall filled the Deep Tunnel 74% full (320 million gallons) on June 18. Rain and wastewater poured into the tunnel at a rate of 6.4 billion gallons per day at around 4:00 p.m. that day. The main Deep Tunnel holds 432 million gallons. To reduce the risk of basement backups, MMSD initiated a combined sewer overflow. MMSD rain gauges measured 4.04 inches at 35th St. and Fond du Lac Ave. in Milwaukee during the two-day storm. One inch of rain on MMSD’s service area equals 7.1 billion gallons of water.

The force of water rushing into sewers can cause collapsing air pockets that can launch manhole covers into the air. There were numerous reports of manhole covers popping off on June 18, leaving open holes in the street that lead directly into the sewer system. Always use extreme caution on flooded streets.

To increase treatment capacity and reduce sewer overflows, MMSD went into storm treatment mode at the Jones Island Water Reclamation Facility on June 18 and 19. The procedure is estimated to have reduced combined sewer overflows by 112 million gallons. Storm treatment involves pumping water directly out of the Deep Tunnel into disinfection chambers at Jones Island. While conducting this style of treatment, MMSD has never violated its discharge permit for state and federal treatment standards.

A separate sewer overflow occurred on June 18 at 35th St. and Roosevelt in Milwaukee. The volume is estimated at 3.7 million gallons. The combined sewer overflow volume is estimated at 360 million gallons. This is the first tunnel related overflow since September of 2016.

MMSD is a regional government agency that provides water reclamation and flood management services for about 1.1 million people in 28 communities in the Greater Milwaukee Area. It serves 411 square miles that cover all, or segments of, six watersheds. The District is a regional government agency established by state law. Learn more at www.mmsd.com

Total Precipitation

Total Precipitation

 

Mentioned in This Press Release

Neighborhoods:

Recent Press Releases by Milwaukee Metropolitan Sewerage District

MMSD Captures & Cleans 99.999% In 2017

The goal nationally is to capture and clean 85% of water that enters a sewer system.

Martinsek & Krueger Elected MMSD Commission Chair, Vice Chair

Kris Martinsek is principal and owner of Martinsek & Associates.

Leave a Reply

You must be an Urban Milwaukee member to leave a comment. Membership, which includes a host of perks, including an ad-free website, tickets to marquee events like Summerfest, the Wisconsin State Fair and the Florentine Opera, a better photo browser and access to members-only, behind-the-scenes tours, starts at $9/month. Learn more.

Join now and cancel anytime.

If you are an existing member, sign-in to leave a comment.

Have questions? Need to report an error? Contact Us