site design, water resources

For nearly every project, the competing concerns of site drainage, offsite impacts and preservation of water quality must all be addressed in compliance with overlapping and sometimes conflicting federal, state and local regulations.

GHA’s Water Resources engineers are thoroughly familiar with the requirements of the various northeastern Illinois county and municipal stormwater ordinances. We regularly prepare documentation and permit submittals to meet these regulatory requirements.

Our strategies combine proven stormwater management approaches with innovative naturalized systems to both reduce stormwater runoff volume and enhance downstream water quality.

GHA regularly performs:

  • Location Drainage Studies
  • Drainage Investigations
  • Hydrologic & Hydraulic Studies
  • Base Flood Elevation Determinations
  • FEMA Letters of Map Revisions & Amendments
  • Stormwater & Floodplain Ordinance Development & Enforcement
  • Storm Sewer Maintenance
  • Storm Sewer Rehabilitation
  • Streambank Restoration

  • Stormwater Detention Design
  • Stormwater Conveyance Design
  • Rain Garden Design
  • Permeable Pavement Design
  • FEMA Letters of Map Revisions & Amendments
  • Stormwater Pollution Prevention Plan Preparation & Review
  • Stormwater Management Program Preparation & Compliance Monitoring
  • Municipal Separate Storm Sewer System (MS4) Compliance Monitoring
  • Sustainable Design