Erosion & Sediment Control

Erosion and Sediment Control

Storm water runoff from construction sites can erode disturbed soils, carry them off-site and contribute significant amounts of sediment (soil) to the surrounding environment. Erosion and sediment control (ESC) techniques are important to maintaining a clean, healthy waterway ecosystem and supporting aquatic wildlife.

In an effort to protect and enhance the integrity of Coquitlam’s drainage system and aquatic environments, including our creeks and rivers, the City of Coquitlam has adopted sustainable development practices for all construction activities.

In September 2013, the City adopted a new Stream and Drainage System Protection Bylaw (No. 4403, 2013) to strengthen the City’s regulations for addressing erosion and sediment control (ESC) issues related to poor construction practices.  Development permits approved on or after September 9, 2013 will adhere to the new Stream and Drainage System Protection Bylaw (No. 4403, 2013) in its entirety.  Development permits that were approved prior to September 9, 2013 will follow the former Stream and Drainage System Protection Bylaw (No. 3447, 2001), except the sections which pertain to “Prohibition of Discharge”.  All sites and permits must adhere to section 3 of the new Bylaw (No. 4403, 2013) which outlines the new “Prohibition of Discharge” requirements regardless of when the permit was issued.

The new Bylaw includes the following key changes:

1. New Sediment Discharge Criteria.  Water discharging from a site during normal weather conditions cannot be more than 25 NTU. Water discharging from a site during and 24 hours after a significant rainfall event (25mm/24 hours or greater) may not exceed 100 NTU.

2. Administrative Requirements.  Requirements for all developments now include ESC Submission forms and developments other than Single Family/Duplex also include an ESC Plan, retaining an ESC Supervisor, attending a pre-construction meeting with City staff and providing appropriate site signage (see Schedules “A”, “B” and “C” in the bylaw).

3. Fees & Security.  Application fees for Single Family/Duplex developments have been set at $200. For all other developments, the Administration and Inspection Fee is based on the Subdivision and Development Servicing Bylaw, as well as a security deposit in the value of 110% of a certified cost estimate.

4. Monitoring/Reporting Requirements.  The ESC Supervisor is responsible for ensuring the implementation of the ESC measures according to the ESC plan, along with inspections, monitoring and maintenance. Two days prior to forecasted significant rainfall events, the ESC Supervisor must hold an onsite meeting to inspect /repair ESC facilities and record actions on a form. In the wet season, monitoring is to be carried out weekly with bi-weekly reporting. In the dry season, monitoring is biweekly with monthly reporting. Reports are also required within seven days of a significant rainfall event.

Reports are to be submitted to

5. Wider Range of Enforcement Options for the City.  These include requirements for site discharge, ESC Plan components, providing submission forms, posting signage, appointing an ESC Supervisor, following stop-work orders and installing, maintaining and monitoring ESC facilities.

The Bylaw applies to all development sites where activities are occurring that result in the disturbance of soil. Specific submission requirements for ESC were developed under this Bylaw for the following two development streams:

    1. Single Family and Duplex Building Permit Applications; and
    2. All other developments.

The following table summarizes the forms and guidelines that apply to each of these development types:

Form/Guideline  Single Family/Duplex Residential All Other

ESC Submission Form:
Single Family and Duplex Building
All Other Developments
For Demolitions

Pre-Development Approval Form  

ESC Advisory Signage Requirement  

Erosion & Sediment Control Daily Site Inspection Checklist  

Erosion & Sediment Control Site Monitoring Report Template  

Significant Rainfall Event Planning Checklist  

Both Single Family/Duplex developments and all other developments must implement certain mandatory ESC facilities. Information on these mandatory ESC facilities as well as a number of other best management practices are contained in the City publications, Erosion and Sediment Control Best Management Practices and Erosion and Sediment Control (ESC) at Residential Building Construction Sites.

Related Documents

Best Management Practices

Expand all

  • 1. Clean Water Management

  • 2. Access/Egress Controls

  • 3. Perimeter Control Measures

  • 4. Onsite Water Management

  • 5. Storm Inlet Protection

  • 6. Disturbed Surfaces Protection (Erosion Control)

  • 7. Paved Road Surfaces Sweeping/Maintenance

Rainfall Monitoring

With the introduction of Coquitlam’s  Stream and Drainage System Protection Bylaw (No. 4403, 2013) in September of 2013, the City of Coquitlam has installed a data logger for rainfall monitoring in the northeast section of Coquitlam. This valuable tool will give all developers, builders, environmental monitors and the general public real time information about the amount of rain collected.

The City of Coquitlam will be monitoring the data collected for the purposes of ensuring that all builders and contractors working in the neighborhood have up to date information and that all relevant criteria in the new Bylaw will be followed to protect all watercourses in the northeast area of Coquitlam.

Coquitlam Rain Gauge

The Government of Canada also has Daily Climate Station Data from their gauge  located on Como Lake Avenue in Coquitlam (note this is not a real time logger and usually is updated every 24-48 hours)

Engineering & Public Works Customer Service

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