1. Welcome to the Libertyville Stormwater Master Plan Open House
September 13, 2017
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2. Meeting Purpose: Gather Detailed Flooding Information from Residents
Please Discuss Your Flooding Experience with Village Staff and Engineers
Information Knowledge RESULTS
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3. Stormwater Master Plan Details
Engineer: Christopher B. Burke Engineering, Ltd
Scope:
Collect flood Information from residents and Village
Hydraulic analysis of existing drainage system
Development of flood risk reduction projects
Prioritize flood risk reduction projects
Master Plan with findings and recommendations
Study Timeline: Approximately 15 Months (see next slide)
Product: Report with prioritized roadmap for specific flood reduction projects in the Village with cost estimates.
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4. Stormwater Master Plan Timeline
TASK
TIMELINE
Preliminary Investigations and Analysis
June 2017 – November 2017
Plan Preparation of Identified Projects
November 2017 – April 2018
Presentation to Public
May 2018
Presentation to Streets Committee
July 2018
Presentation to Village Board
August 2018
Final Report & Stormwater Rate Study
September 2018
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5. 21st Century Storms vs. 20th Century Infrastructure
Old Stormwater Infrastructure
Many older areas of Village built 1950s – 1980s
Prior to modern stormwater planning and design standards
Small storm sewers and little stormwater storage
No safe overland flow routes
Recent Intense Storm Events
August 28, 2017: 3.0 inches in 2 hours
July 12, 2017: 7.0 inches in 12 hours
July 24, 2011: 3.7 inches in 6 hours
Result: Not enough stormwater conveyance and storage during large storm events
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6. Recent Rainfall Events – July 2017
Rainfall: 7.0 inches of rain in 12 hours
130-Year storm event (0.8% chance of occurring every year)*
Widespread Local Drainage System Flooding and Des Plaines River Flooding
Flooded commercial and residential structures
Flooded roadways
Flooded yards
Stormwater inflow into the sanitary sewer system
Surcharge of the sanitary sewer system
July 2017 Post Storm Village Flood Survey
> 400 flooding reports
97 flood questionnaires completed
Similar Severe Flooding throughout Lake County
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*as determined by Lake County Stormwater Management Commission

7. Recent Rainfall Events – July 2017
Intersection of Crane and Drake
Ames Street
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8. Recent Rainfall Events – July 2017
Sanitary Sewer Surcharge
Loyola Drive
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9. Recent Rainfall Events – July 2017
Village Wastewater Treatment Plant
Basement Flooding
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10. Recent Rainfall Events – July 2017
West Ellis Avenue
Butler Lake
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11. Recent Rainfall Events – July 2017
Butterfield Road
Lake Minear
Claridge Drive
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12. Recent Rainfall Events – July 2017
Sandstone Drive
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13. Recent Rainfall Events – August 2017
Rainfall: 3.0 inches of rain in 2 hours
Greater than a 25-Year Storm Event (4% chance of occurring every year)
Local Drainage System Flooding
Flooded roadways
Flooded yards
Flooded Basements
Carter Street
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14. Recent Rainfall Events – August 2017
Ames Street
4th Avenue and Meadow Lane
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15. Looking Forward….
Just like a home from the 1950’s needs major upgrades – so does our stormwater infrastructure
A prioritized plan is critical to spend Village resources in the most efficient and cost effective manner as possible
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16. Future and Beyond
Stormwater Construction Projects - Dependent on Study Outcome
Stormwater Conveyance and Storage Improvements
Compliance with local, state and federal regulations
Green Infrastructure
Funding Options
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17. Future - 2018 and Beyond Flood-Proofing of Homes and Businesses*
Yard re-grading
Foundation sealing
Storm sump pump improvements (auxiliary/back-up pump)
*More information is available on flood-proofing at the tables in the Open House
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18. Future - 2018 and Beyond Flood-Proofing of Homes and Businesses*
Sanitary Sewer backup prevention
Existing Condition
Proposed Condition
*More information is available on flood-proofing at the tables in the Open House
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19. Future - 2018 and Beyond Revisions to Village Policies and Regulations
Consideration of Stormwater Utility Fee or Other Funding Mechanism
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20. Stormwater Master Plan Goal
Develop Projects and Programs to Reduce the Frequency and Risk of Flooding
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21. Please Remember to Sign in and Complete a Flood Questionnaire
End of Presentation
Please Remember to Sign in and
Complete a Flood Questionnaire
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