Site-Tested Design

Stormwater Management

Site-tested stormwater design for single-family residential and small-scale projects across Vancouver Island and coastal BC.

Stormwater Solutions Backed by Site Testing

Coast Geotechnical provides stormwater management design for single-family residential and small-scale projects across Vancouver Island and coastal BC. Every design is backed by a site assessment and on-site infiltration testing, so the system suits the actual ground conditions rather than relying on generic assumptions.

Our integrated geotechnical and stormwater approach means soil and groundwater conditions are confirmed up front, which avoids surprises during construction and keeps permitting on track.

Scope of Services

  • Stormwater Management Plans (SWMPs) for building permits and small subdivisions
  • On-site infiltration testing
  • Stormwater storage system sizing
  • Site drainage system design
  • Erosion and Sediment Control (ESC) plans
  • Construction phase services and field reviews

How It Works

01

Site Assessment

We visit the site to assess soils, groundwater, and topography, and conduct on-site infiltration testing to confirm how water actually moves through the ground.

02

Design & Docs

We prepare a stormwater management plan suited to your site, including stormwater storage system sizing, drainage system layouts, and ESC plans for permit submission.

03

Construction Support

We provide field reviews and construction phase services so the system is installed as designed and performs as intended.

Common Questions

Frequently Asked Questions

Do I need a stormwater management plan for my building permit? +
Many municipalities on Vancouver Island and across coastal BC now require a stormwater management plan as part of the building permit process, especially for new construction or sites where impervious area is increasing. We can confirm requirements with your local jurisdiction and prepare a plan that meets them.
What is on-site infiltration testing? +
Infiltration testing measures how quickly water moves through the soil at your site. The result is used to size soakaways and other infiltration based components, so the system matches actual ground conditions instead of relying on generic assumptions.
Can you handle the geotechnical and stormwater work together? +
Yes. Combining the geotechnical investigation and stormwater design under one team means soil and groundwater conditions are confirmed once, up front, which helps avoid surprises during construction and keeps permitting on track.