Stormwater runoff is a leading cause of water pollution. As runoff flows off roofs and streets, it picks up carcinogens, pathogens and other dangerous compounds that can have disastrous effects.

CHA takes an environmentally friendly approach to minimize erosion, sedimentation and pollution caused by stormwater. We have designed systems of all shapes and sizes using not only traditional but also innovative low-impact design best management practices for residential, commercial, institutional, and municipal clients. Our team is well-versed in the latest stormwater regulations, and they vigorously embrace a “green” design philosophy in all their stormwater design, permitting, and planning work.

Our CSO and stormwater services include:
  • Municipal Stormwater Systems
  • Green Infrastructure
  • Combined Sewer Overflow (CSO) Separation
  • Floodway/Floodplain Analyses
  • Long-term Control Plan Preparation
  • Hydrologic and Hydraulic Modeling
  • Stormwater Pollution Prevention Plan Preparation
  • Best Management Practices Plans