drainage

engineering

Protecting communities through resilient stormwater solutions that reduce flooding risk, improve water quality, and strengthen long-term infrastructure performance.

overview

Managing Stormwater in an Increasingly Complex Environment

Stormwater challenges are becoming more frequent and more severe — from localized flooding and aging infrastructure to evolving regulations and community expectations. Left unaddressed, these issues can impact public safety, damage property, and strain municipal resources.


HLR helps communities take a proactive, comprehensive approach to drainage engineering. Through advanced modeling, thoughtful design, and regulatory expertise, we deliver solutions that reduce flood risk, improve system performance, and prepare projects for long-term success.

analysis

Understanding System Performance Through Advanced Modeling

Effective drainage solutions begin with a clear understanding of how water moves through a community.


  • Hydrologic and hydraulic modeling
  • Watershed analysis and stormwater master planning
  • Identification and prioritization of flooding problem areas
  • Data-driven recommendations for system improvements

design

Designing Systems That Reduce Flood Risk

Stormwater infrastructure must perform under pressure — especially during major rainfall events.


  • Storm sewer system design
  • Detention and retention basin design (above and below ground)
  • Pump station analysis and design
  • Grading and system optimization

sustainability

Implementing Sustainable, Long-Term Solutions

Modern drainage design goes beyond conveyance — it focuses on restoring natural processes and improving environmental outcomes.


  • Infiltration systems (trenches, dry wells)
  • Rain gardens and native plantings
  • Green infrastructure and volume control solutions
  • Groundwater recharge strategies

floodplain

Navigating Floodplain Impacts and Risk

Understanding floodplain behavior is critical for safe and compliant project development.


  • Floodplain and floodway analysis
  • Base flood elevation impact evaluations
  • Regulatory compliance assessments
  • Risk identification for communities and property owners

compliance & Permitting

Supporting Compliance, Permitting, and Complex Documentation

Drainage improvements often require coordination across multiple agencies, detailed documentation, and strict regulatory compliance. Missing requirements can delay approvals and increase project costs.


HLR helps communities navigate these complexities efficiently while keeping projects moving forward.

  • FEMA map revisions and floodplain delineation
  • Elevation certificates for flood insurance reduction
  • Local, state, and federal permitting coordination
  • IDOT drainage studies and hydraulic reports

funding

Positioning Projects for Funding and Implementation

Successful drainage improvements often depend on more than engineering — they require funding readiness, agency alignment, and clear project justification.


HLR helps clients prepare documentation, coordinate with stakeholders, and position projects to compete for grants and financing opportunities while minimizing delays.

Experience That Delivers Measurable Results

PROVEN PERFORMANCE

Municipal Expertise

Decades of experience supporting local agencies with stormwater planning and infrastructure improvements.

Proven System Planning

Successful development of watershed studies and stormwater master plans that guide long-term investment.

Regulatory Relationships

Strong coordination with local, county, state, and federal agencies to streamline approvals.

Efficient Project Delivery

Practical, cost-effective solutions that minimize risk, reduce delays, and maximize performance.

Trusted by Municipal Leaders Across Illinois

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"We’ve been very happy with the quality of their work."

“We’ve been using HLR for over 5 years to manage the Eaglebrook wetlands and we’ve been very happy with the quality of their work.” 

Rich Babica

Director of Public Works, City of Geneva

extend your team

Ready to Improve Your Community’s Stormwater System?

Partner with HLR to develop drainage solutions that protect your infrastructure, reduce risk, and support long-term performance.