Rainfall Impacts in Lake County

Lake County has been experiencing more frequent and stronger rainfall events. Recently, the Illinois State Water Survey released updated statistical rainfall data for Bulletin 70--Frequency Distributions of Heavy Precipitation in Illinois. This new data impacts not only the residents and business owners of Lake County, but also public and private development projects. SMC will be making revisions to the Watershed Development Ordinance (WDO), a countywide ordinance that sets forth minimum requirements for the stormwater management aspects of development within Lake County  

Watershed Development Ordinance Timeline Highlights 

WDO Timeline

Increased Rainfall Public Information Meetings

SMC presented the increased rainfall data along with a timeline of the regulatory process, provide resources and tools for best practices, and discuss stormwater-related issues and concerns from the audience. Members of the public, stakeholders, and individuals with an interest in hearing more about how rainfall affects Lake County were encouraged to attend.

View the Presentations:
Increased Rainfall Public Information Meeting (PDF)
Weather and Rainfall Increase (PDF)
Gaging the Weather (PDF)
Mosquitoes (PDF)


Floodproofing and Rainfall Public Information Meeting Hosted by Lake County Board Chair Sandy Hart, Lake County District 7 Board Member Steve Carlson, and Gurnee Mayor Krysti Kovarik. 

Lake County has been experiencing more frequent and stronger rainfall events, which not only impacts the residents and business owners of Lake County, but also public and private development projects. SMC will present floodproofing tips businesses and homeowners can use to help safeguard their property, share data on the increased rainfall Lake County is receiving, provide resources and tools for best practices, and answer questions from the audience.

Tuesday, September 17
10 a.m. - Noon
Warren-Newport Public Library, Meeting Room A/B
224 O’Plaine Rd, Gurnee

Increased Rainfall Public Information Meeting-July 24, 2019

Upper Des Plaines Inundation Stage vs Year Flood   

The Upper Des Plaines River inundation map prepared by the Illinois Office of Water Resources breaks the River up into three sections corresponding to the USGS river gages: Russell, Gurnee/Route 120 and Lincolnshire. The inundation map has a slider for river stage. River stage is the depth of water above the gage datum which is somewhere below the typical lowest river level anticipated. This table compares the “Year Flood” to the stage at each of the gage locations to give an idea of how significant a given stage is. For example, a “100-year” flood at the Russell gage is at a Stage of 14.


Approximate Stage


Year flood

Russell

Gurnee

Lincolnshire

10

10

11

16

50

13

14

17

100

14

15

18

500

15

16

19