Welcome to the Libertyville Stormwater Master Plan Open House September 13, 2017 Slide 1 of 21

Meeting Purpose: Gather Detailed Flooding Information from Residents Please Discuss Your Flooding Experience with Village Staff and Engineers Information Knowledge RESULTS Slide 2 of 21

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. Slide 3 of 21

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 Slide 4 of 21

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 Slide 5 of 21

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 Slide 6 of 21 *as determined by Lake County Stormwater Management Commission

Recent Rainfall Events – July 2017 Intersection of Crane and Drake Ames Street Slide 7 of 21

Recent Rainfall Events – July 2017 Sanitary Sewer Surcharge Loyola Drive Slide 8 of 21

Recent Rainfall Events – July 2017 Village Wastewater Treatment Plant Basement Flooding Slide 9 of 21

Recent Rainfall Events – July 2017 West Ellis Avenue Butler Lake Slide 10 of 21

Recent Rainfall Events – July 2017 Butterfield Road Lake Minear Claridge Drive Slide 11 of 21

Recent Rainfall Events – July 2017 Sandstone Drive Slide 12 of 21

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 Slide 13 of 21

Recent Rainfall Events – August 2017 Ames Street 4th Avenue and Meadow Lane Slide 14 of 21

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 Slide 15 of 21

Future - 2018 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 Slide 16 of 21

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 Slide 17 of 21

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 Slide 18 of 21

Future - 2018 and Beyond Revisions to Village Policies and Regulations Consideration of Stormwater Utility Fee or Other Funding Mechanism Slide 19 of 21

Stormwater Master Plan Goal Develop Projects and Programs to Reduce the Frequency and Risk of Flooding Slide 20 of 21

Please Remember to Sign in and Complete a Flood Questionnaire End of Presentation Please Remember to Sign in and Complete a Flood Questionnaire Slide 21 of 21