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For Stormwater Professionals

Visit our Training Page for details on upcoming training opportunities and recordings and resources from past training events.

The term stormwater professional includes staff from multiple disciplines. It takes teams from several entities to protect our waterways during construction projects and to implement stormwater control measures throughout our communities. From the designers and engineers who plan projects to the staff who build and manage work sites to the landscapers responsible for maintaining and supporting revegetation after construction, everyone has a role to play in keeping stormwater clean.

The KICP has compiled resources for stormwater professionals and provides training opportunities throughout the year.

Construction Impacts Waterways

The construction industry has some of the highest levels of responsibility regarding stormwater pollution prevention. There are rules established by the EPA which the construction industry is required to follow. The Keep it Clean partners have also adopted ordinances that control all construction and development activity.

How does the construction industry impact water quality?

Polluted stormwater runoff from construction sites often flows to storm drainage systems and is discharged into local rivers and streams. The runoff can contain:

  • Sediment in quantities much higher than what is deposited naturally.
  • Nutrients such as nitrogen and phosphorous that can cause significant water quality impairment.
  • Solid and sanitary wastes, pesticides, oil and grease, concrete truck washout, construction chemicals, construction debris, metals, and other by-products of construction processes.

Effective construction site pollution prevention can dramatically reduce pollution into stream ecosystems.

Construction Regulations for the Boulder St. Vrain Watershed

The Keep it Clean partners have adopted ordinances that control all construction and development activity that disturbs one or more acres of land, as well as activity that disturbs less than 1 acre of land, but is part of a larger common plan of development.

The owner and/or operator of the construction site will be responsible for complying with these requirements and plays a key role in protecting our water quality. These requirements include temporary erosion and sediment control practices during construction and the installation of permanent stormwater quality facilities to ensure long-term protection of the water quality for runoff from the developed site. Fines up to $1,000 per day may be imposed for ordinance violations.

In general, construction and development contractors are responsible for:

During Design Review— Owner/operator must develop the following:

    1. Stormwater Management Plan (SWMP), including erosion and sediment control practices and proposed permanent stormwater quality controls or Best Management Practices (BMPs). Guidelines for preparing a SWMP can be found at CDPHE’s website. Temporary and permanent stormwater quality controls, or BMPs, are to be designed according to the Urban Drainage and Flood Control District’s Urban Storm Drainage Criteria Manual –Volume 3, or other methods approved by the community.
    2. Owner/operator is responsible for the following: executing a maintenance agreement with the municipality to ensure future inspection, maintenance, repairs, and proper functioning of the permanent BMPs.

During Pre-Construction Meeting— Owner/operator must provide:

    1. A copy of the application submittal for coverage under the State’s General Permit of Construction Activities.
    2. Documentation of an erosion and sediment control administrator for personnel responsible for supervising the installation and maintenance of sediment and erosion control practices.

During Construction— Owner/operator is responsible for the following:

    1. Maintain a copy of the SWMP onsite at all times. The approved SWMP must be maintained and made available upon request.
    2. Install and maintain erosion and sediment control BMPs as specified in the SWMP. Sediment, debris or other pollutants from construction operations must be managed to prevent flow to the storm drainage system.
    3. Maintain inspection and maintenance records of BMPs onsite with the SWMP.
    4. The installation and maintenance of BMPs shall be supervised by personnel certified in erosion and sediment control.

After Construction— Owner/operator is responsible for the following:

    1. Implement ongoing inspection, maintenance, and repairs of permanent BMPs according to the maintenance agreement with the municipality.
    2. Submit written documentation that permanent BMPs were constructed in accordance with approved plans submitted in the design review phase.

General Requirements for all Construction Activities (regardless of size)
Owner/operator is responsible for the following:

    1. Manage construction activities to prevent the illegal discharge of sediments or other pollutants to the storm drainage system.
    2. Receive a permit from CDPHE to discharge any non-stormwater discharge to the storm drainage system. These discharges may include those covered under the State’s CDPS permit system, such as construction dewatering.

For more specifics about these requirements contact the Keep it Clean Partner responsible for the jurisdiction in which your project is located.

Post-Construction Work to Protect Waterways

Stormwater protection does not stop once construction is done. Ponds, swales, ditches, and depressions that you see every day may actually be engineered stormwater facilities, known as stormwater control measures (SCMs) or best management practices (BMPs). When constructed and maintained properly these facilities have the ability to settle sediment and debris and reduce peak flows, providing a layer of protection for our creeks. Starting in 2006, any new construction or redevelopment project over an acre was required to install permanent SCMs in order to treat stormwater runoff from the development. The community in which the development has taken place then requires inspection and maintenance so that the SCM continues to function as designed.

Low Impact Development

What is LID?

The literature is full of terms such as “Smart Growth”, “Low Impact Development”, “Sustainable Development”, etc. All of these terms refer to stormwater management practices that promote the reduction of runoff volume from urban areas.

The goal of Low Impact Development (LID) is to allow for development of a site while maintaining as much of its natural hydrology as possible, such as infiltration, frequency and volume of discharges, and groundwater recharge.

In the LID approach, stormwater is managed in small, source control landscape features rather than in large, end-of-pipe pond structures located at the downstream extent of drainage areas. However, ponds may be required in addition to LID to create a “treatment train” effect. Through LID, hydrologic functions such as infiltration, peak and volume of discharges, and ground water recharge can be maintained with the use of reduced impervious surfaces, functional grading, open channel sections, disconnection and utilization of runoff, and the use of bioretention/filtration landscape areas.

With the LID approach, receiving waters experience little change in the volume, frequency, or quality of runoff or in the base flows fed by groundwater.

Design

Design Before Construction

All the KICP communities reference Urban Drainage and Flood Control’s Volume 3 for SCM design. The Urban Drainage Flood Control District Volume 3 Outlines the four-step SCM planning process:

  1. Implementing stormwater runoff reduction practices.
  2. Providing treatment of the Water Quality Capture Volume.
  3. Implementing streambank and channel stabilization techniques for any drainage ways within or adjacent to a project site.
  4. Providing additional treatment for pollution hot spots.

Developers, please consider LID when submitting your plans

  • Stormwater quality needs to be addressed early in the design process. It is recommended that discussions regarding proposed BMPs occur early in each project between the developer’s planner and engineer and municipal staff.
  • Take advantage of the entire site when planning for stormwater quality treatment.
  • Implement source controls to prevent and minimize the discharge of pollutants.
  • Incorporate stormwater treatment controls to remove pollutants from runoff.
  • Minimize directly connected impervious areas.
  • Maximize permeability at a project site.
  • Select treatment areas that promote greater infiltration.
  • Reduce runoff rates and volumes to more closely match natural conditions.
  • Use drainage as a design element.
  • Integrate stormwater quality management and flood control.
  • Protect sensitive areas from encroachment.
  • Design sustainable facilities that can be safely and economically maintained.

The LID design focus is to manage the stormwater as close as possible to its source—that is, on each individual lot rather than conveying the runoff to a larger regional pond.

Retrofitting sites to improve water quality is also essential to the health of our streams.

Inspection & Maintenance

All the KICP communities require that owners inspect and maintain their SCMs to ensure that they are working properly. Inspections and maintenance are necessary to ensure the SCM functions as designed and has a positive impact on local stream quality.

Inspection and maintenance plans detailing inspections, maintenance, frequency, and estimated costs are highly recommended, and in some cases it is required. Please budget accordingly.

Gather your resources

  • Review The Guide to Inspecting and Maintaining Structural Stormwater BMPs
  • Get a copy of your communities’ site plan and as-built drawings
  • Locate your SCM (s)
  • Contact a representative from your community to help determine the inspection and maintenance needs of your BMP to ensure it continues to function as designed
  • Write up an inspection and maintenance plan with the corresponding budget
  • Enter into a contract or schedule internally for inspection and maintenance
  • Save your inspection and maintenance records. Your community may request to review them or you may be required to submit them annually

Municipal Operations

Stormwater runoff from municipal operations can affect water quality. These activities range from the storage and handling of harmful chemicals to the maintenance of municipal properties, vehicles, roads, parks, and storm sewer systems. Activities such as integrated pest management, water conservation, recycling, erosion control, proper storage of materials, repair of equipment, spill clean up and education programs can prove to be very effective in addressing these pollutant sources. Below are best management practices and standard operating procedures for daily activities that could impact water quality. The Keep it Clean Partnership also provides a variety of educational materials that can be used by any municipality to conduct outreach to their residents about protecting their watershed.