Stormwater

About Stormwater

What is Stormwater?

Stormwater is rainwater that flows over surfaces such as roads roofs, parking lots, and lawns. As stormwater travels across these surfaces, it picks up pollutants such as oils, chemicals, litter, and sediment. Eventually, this contaminated water makes its way into local waterbodies such as Curlew Creek, Cedar Creek, Jerry Branch, Clearwater Harbor, and St. Joseph’s Sound – this can potentially hurt water quality and aquatic life.

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Why Does Stormwater Matter?

Stormwater runoff is a significant concern because it can lead to water pollution of our surface waters. Stormwater runoff can carry pollutants into waterways leading to water quality issues and disruptions in ecosystem services. As Dunedin develops, impervious surfaces increase and lead to heavier stormwater runoff flow. In turn, this can increase the risk of bank erosion and flooding.

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Managing Stormwater

In order to keep our waterways clean, it is important that we allow Only Rain Down the Storm Drain! It is vital that residents and businesses dispose of waste materials properly and avoid dumping anything into stormwater drains.

To reduce the impact of stormwater runoff, the City employs a variety of strategies to manage and treat the water before it reaches our local waterways. These efforts include:

  • Stormwater Infrastructure: The city has a stormwater system consisting of pipes, catch basins, inlets, manholes, curbs, roadways, and ponds designed to collect and manage stormwater efficiently.
  • Water Quality Monitoring and Treatment: Through regular monitoring, the City ensures that water quality is maintained and measures are taken to treat stormwater-related issues.
  • Sediment Management: The City installs and maintains Continuous Deflection System (CDS) and Suntree Units. Roads are also swept quarterly to prevent excessive sediment from entering our waterways.
  • Green Infrastructure: The city is investing in green infrastructure solutions such as rain gardens and living shorelines that help absorb stormwater and reduce runoff, enhancing the natural water filtration process.
  • Public Education and Outreach: The City provides educational programs and resources for residents to encourage responsible stormwater management practices, such as proper disposal of waste.



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Stormwater Infrastructure

Stormwater Infrastructure


Stormwater systems are designed to control and direct the flow of stormwater runoff through a city’s infrastructure. This ensures that excess rainwater doesn’t overwhelm the environment, cause flooding, or carry pollutants into local waterbodies.

These systems help protect the natural ecosystem, maintain water quality, and prevent erosion or property damage. Dunedin’s stormwater systems include various facilities designed to manage runoff and prevent flooding. These include drainage ditches, swales, retention ponds, etc.

The maintenance and upkeep of these facilities are essential to ensure effective stormwater management, especially during heavy rainfall or storms. Maintenance is performed on a routine basis and as needed.

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Water Quality Monitoring

Water Quality Monitoring 


In addition to the upkeep of stormwater infrastructure, preventative measures are necessary. The City of Dunedin works to be self-sufficient in maintaining its drainage systems largely through water quality monitoring. Surface waters of Cedar Creek, Curlew Creek, Spring Branch, as well as Jerry Lake, are tested several times annually.

Stream Surface Water Quality Monitoring

  • This monitoring helps assess the health of the streams, including nutrient levels, metal contamination, and other indicators of water quality.
  • Key Metrics Tested: Bacterial content, pH levels, dissolved oxygen, turbidity, and nutrient concentrations.


Jerry Lake Water Quality Monitoring

  • Purpose: Ensures the lake’s water quality is maintained, focusing on potential pollutants and general health indicators.
  • Key Metrics Tested: Similar to stream water quality monitoring, with additional focus on aquatic life and ecosystem health (specifically vegetation diversity).

 

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      Sediment Monitoring

      Sediment Monitoring


      Regular monitoring and the cleaning of streets is critical for maintaining public safety and ensuring that stormwater is not contaminated by excess debris, oils, or sediment. Dunedin has a one of a kind sediment monitoring program. Compared to neighboring cities, Dunedin is particularly thorough in testing sediments found in our continuous deflection units and street sweepers in order to determine the types of nutrients and metals found on our streets. As part of the city’s sediment monitoring program, sediment samples are regularly collected from various points within the street drainage system (CDS units, Suntree units, and street sweepers). Sediment is sampled on a monthly basis. Testing these materials provides valuable insight into the effectiveness of the city’s water quality management strategies.


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      Street Sweeping

      Sweepers help remove dirt, leaves, litter, and other pollutants from streets to keep stormwater runoff as clean as possible. Street sweepers are specialized vehicles equipped with rotating brushes and vacuums -- the brushes lift debris from the street surface while the vacuum system collects the material, which is then transported to the stormwater facility for testing.

      Vactor Truck Operations

      The Vactor truck is a powerful vacuum truck used for cleaning stormwater infrastructure. It can remove sediment and debris from areas like catch basins, pipes, and other parts of the storm drainage system. Vactor trucks ensure that stormwater drainage systems remain clear of sediment and other blockages, helping to prevent flooding and maintain water quality. Typically, these operations are performed during routine maintenance or before heavy rainfall events.

      CDS & Suntree Units

      Continuous Deflection Systems (CDS) units trap and filter pollutants such as debris, oils, and metals from stormwater before they enter the drainage system. These units help improve water quality by removing harmful substances that would otherwise flow directly into local water bodies. Similar to CDS units, Suntree units provide additional filtration, targeting fine particles and pollutants that can negatively impact water quality. They are often installed in areas where sediment and pollutant runoff are higher. Both CDS and Suntree units require regular cleaning and maintenance to ensure that they continue to function effectively and remove pollutants from stormwater runoff.

       

      Construction Site Monitoring

      Construction Site Monitoring


      Dunedin monitors and enforces illicit discharge violations at construction sites and across the city to prevent illicit discharges into the stormwater system. This is a key way in which the city makes sure to keep Only Rain Down the Storm Drain!

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      Illicit discharges       are any unauthorized or illegal releases of pollutants into the stormwater system, such as chemicals, oils, construction runoff, and waste materials. Dunedin conducts routine inspections to identify illicit discharges in public areas within the city’s right-of-way. These inspections are part of the city’s commitment to maintaining water quality and ensuring that the stormwater system remains free of blockages and harmful contaminants. The City of Dunedin prohibits any illicit discharge from entering the stormwater system and can assess fines for an illicit discharge entering the stormwater system. Reference code: (Ord. No. 20-27, § 1, 9-3-2020) Sec. 78-470. - Unlawful and illicit discharge enforcement


      How can illicit discharges on construction sites be prevented?

      Best Management Practices, or BMPs, are techniques and methods used to control the amount of sediment, debris, and pollutants that leave construction sites. Examples include silt fences, inlet protection, stabilized construction entrances, rip rap, the proper storage of chemicals, etc. Construction sites are monitored regularly to ensure that BMPs are in place and functioning. If violations are found, the city may issue fines or require corrective action to minimize environmental impacts.


      What should I do in the event of an illicit discharge on a construction site?

      If you believe you have found evidence of an illicit discharge, please contact the City of Dunedin’s Stormwater Program at 727-298-3232.

       

      HOA Managed & Privately Owned Ponds

      The City of Dunedin performs regular maintenance on the stormwater systems owned and operated by the City. This routine maintenance includes, but is not limited to:

      • Ditch mowing and cleaning
      • Pond cleaning and inspections
      • Aquatic plant management
      • Pipe repair and replacement
      • Pipe cleaning
      • Street sweeping
      • CDS unit quarterly cleaning

      However, privately-owned stormwater systems such as those found within many residential communities, condominium communities, and commercial properties are responsible for the regular maintenance of their systems.

      When was the last time your Homeowners Association, Condo Association, or joint pond owners maintained your community’s stormwater drainage system?

      This question is an important one, since the stormwater ponds and stormwater treatment areas within your community must be kept regularly cleaned of debris and overgrown vegetation in order to function correctly and minimize the possibility of storm flooding in your community.

      Many times the current Homeowners Association, Condo Association and Commercial Association Board of Directors may not be aware of this maintenance responsibility, which can lead to overgrown and debris-clogged ponds, inlets and pipes which will back up during heavy rain events and cause localized flooding.

      Help be good stewards of your community and learn more about what is required to keep stormwater ponds and drainage systems operating at peak efficiency.

      For additional information on how to maintain your community stormwater drainage system, please see the below document from the Southwest Florida Water Management District:

      Studies & Reports
      The City of Dunedin Stormwater Master Plan Update

      The City of Dunedin Stormwater Master Plan Update was completed in 2020 as an update to the Master Drainage Plan of 2003.  The Stormwater Master Plan Update is the first of its kind to encompass not only a watershed model and BMP analysis, but also includes a Vulnerability Assessment, Downtown Regional Plan, CRS recommendations, and an environmental assessment.  The final report is linked below:

      Education Programs

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      Only Rain Down the Storm Drain

      You may have noticed the markers that are on several storm drains throughout the city. This educational campaign is focused on preventing illicit discharges, which are any pollutants or non-stormwater substances entering storm drains or waterways. These discharges can include chemicals, sediment, oils, or waste, which can harm the environment and water quality. The campaign encourages the community to keep storm drains clear of anything other than rainwater -- with a few exceptions, such as water from firefighting, air conditioning condensation, and landscape irrigation -- as specified in the City of Dunedin’s Code of Ordinances on Stormwater Management. The message highlights the importance of keeping stormwater systems clean and protecting local waterways for the health and safety of the community. The call to action emphasizes the city’s efforts against pollution, urging residents to be mindful and contribute to preserving a cleaner environment.


      Storm Drain Mural Painting Program

      This program, pioneered by Environmental Specialist, Nicole Silverman, and funded by the Tampa Bay Regional Planning Council and the Florida Department of Transportation, invited student artists of all ages from Pinellas County to submit 2D artwork for murals on four pre-selected storm drains. The campaign raises environmental awareness by incorporating the theme “Only Rain Down the Drain,” highlighting the importance of protecting water quality and preventing pollution. Submissions were reviewed by the City’s Arts & Culture Advisory Committee, with the selected designs now set to be installed on the storm drains throughout Dunedin, serving as lasting public art pieces that promote environmental sustainability.


      Make a Difference

      Stormwater runoff can have a significant impact on the environment, but everyone has the power to play a part in making positive change. Here are simple actions you can take to help protect Dunedin’s water quality and the local ecosystem:


      1. Only Rain Down the Drain

      Avoid dumping oil, trash, or household chemicals down storm drains. These materials pollute our waterways and harm wildlife.


      2. Properly Dispose of Hazardous Materials

      Safely dispose of household chemicals, paints, and other hazardous materials by contacting the Pinellas County solid waste department located at 3095 114th Ave. N., St. Petersburg, FL 33716.

      Pinellas Solid Waste Department’s Contact Information: (727) 464-7500

      View the Household Hazardous Waste Program’s Collection Calendar.


      3. Minimize Lawn Chemicals

      Instead of chemical fertilizers, pesticides, or herbicides, use natural alternatives to care for your lawn and garden. If fertilizer cannot be avoided look for those that are labeled with "16 0 8" for balanced nutrients, "0" phosphorus, and 50% "slowly available" nitrogen and make sure to follow directions as well as local regulations regarding summer bans! Please click on the link for more information regarding Pinellas County’s Fertilizer Ordinance. 

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      4.       Practice Proper Car Care

      Repair Leaks: Fix oil and fluid leaks in your vehicle to prevent them from washing into storm drains.

      Keep Tires Properly Inflated: This helps improve fuel efficiency and reduces tire wear.

      Use Commercial Car Washes: These facilities treat the water before releasing it into the environment. Alternatively, wash your car on the grass to allow water to soak into the ground rather than pervious roadways that can allow chemicals to enter storm drains.

      Drive Less: Reducing driving helps decrease runoff and pollution—opt for walking or biking instead!


      5. Plant Florida-Friendly Vegetation

      Choose native or drought-tolerant plants that reduce the need for chemical fertilizers and conserve water. Consider creating a rain garden in your yard to capture and filter stormwater!


      6. Scoop the Poop!

      Always clean up after your pet! Pet waste is a significant source of pollutants that can wash into storm drains and contaminate water bodies. Consider purchasing recycled plastic bags for waste disposal.



      7. Utilize Rain Barrels
      Install a rain barrel to collect rainwater for use in your garden.


      8. Maintain Your Yard, Driveway, and Gutters

      Regularly clear debris from your yard, driveway, and gutters to prevent stormwater from carrying pollutants into the storm drain system.


      9. Get Involved in Community Clean-Ups

      Join local clean-up events and workshops to help protect your community. Find out about upcoming events and volunteer opportunities on our City Calendar.


      10. Report Issues

      If you see issues such as clogged storm drains, pollution, or illegal dumping, report them to the proper city department!

      Stormwater Program: 727-298-3232

      Stormwater Management FAQs


      What causes stormwater runoff pollution?

      Answer: Stormwater runoff pollution occurs when rainwater picks up contaminants as it flows over impervious surfaces like roads, parking lots, and rooftops. These contaminants can include oil, grease, litter, chemicals, fertilizers, pesticides, sediment, and pet waste, which are then carried into the stormwater system and eventually discharged into local waterways or the ocean!



      What is green infrastructure, and how does it relate to stormwater management?

      Answer: Green infrastructure refers to natural systems or engineered systems that use vegetation, soils, and other natural processes to manage stormwater. This includes rain gardens, permeable pavements, living shorelines and green roofs. It’s different from "gray" infrastructure, which typically refers to traditional engineered systems like pipes and concrete channels. Green infrastructure helps absorb rainwater, reduce runoff, and improve water quality by filtering pollutants naturally.


      How does the city manage stormwater?

      Answer: The City manages stormwater through a combination of routine maintenance, sediment control, and planning/engineering. This includes maintaining and cleaning stormwater infrastructure like drains, pipes, and retention ponds; implementing pollution control measures such as street sweeping and sediment monitoring; and planning for effective stormwater management through the construction of infrastructure designed to reduce flooding and protect water quality.


      Does the stormwater section manage sanitary and stormwater sewers?

      Answer: No, the stormwater section specifically manages stormwater runoff, which is separate from sanitary sewer systems. Stormwater systems handle rainwater and runoff, while sanitary sewer systems carry wastewater from homes and businesses.

      The sanitary sewer carries wastewater from toilets, sinks, and other household drains to a treatment plant for processing. A storm drain, on the other hand, handles rainwater runoff, carrying it to nearby waterways or retention areas. Unlike sanitary sewers, storm drains are not treated and can carry pollutants directly into the environment.


      Who is responsible for stormwater management on private property?

      Answer: Property owners are responsible for managing stormwater on their own private property. This includes maintaining any stormwater systems.


      What is a part of the City’s stormwater system?

      Answer: The city's stormwater system includes a network of drains, pipes, culverts, catch basins, and retention ponds. It also involves natural systems like Cedar Creek, Curlew Creek, and Spring Branch within the watershed. The system collects rainwater, directs it to treatment facilities or natural outflows, such as the St. Joseph Sound, and helps prevent flooding and water quality degradation.


      Why does the City need a stormwater utility fee?

      Answer: The stormwater fee funds the maintenance, improvement, and expansion of the city's stormwater infrastructure. This includes cleaning drains, maintaining retention ponds, and implementing pollution control measures. The fee ensures that the City can effectively manage stormwater runoff, prevent flooding, and protect water quality.

       

       

       

      Contact

      Stormwater Program
      727-298-3232

      Public Services
      1405 County Road 1
      Monday - Friday, 7:30 a.m. - 4:30 p.m.

      Restrictions

      Pinellas County’s rainy season fertilizer restrictions will take effect Thursday, June 1, and will last through Sept. 30.

      • Lawn, landscape fertilizers with nitrogen and/or phosphorus may not be sold or used through Sept. 30.
      • Phosphorus may not be used any time of year unless a soil test confirms the need.
      • Keep fertilizer 10 feet away from the top of the bank of any surface water, landward edge of a seawall, or a designated wetland.
      • Fertilizer runoff can pollute waterways and cause harmful algae blooms.

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