Retention ponds are a vital part of stormwater management, controlling stormwater runoff, reducing flooding and improving water quality. These ponds are often referred to as stormwater ponds and need maintenance to work effectively. Without regular care they can become clogged with debris, overgrown with weeds or lose their ability to manage water due to sediment build up.

A neglected pond can lead to significant maintenance oversights and environmental issues, resulting in costly repairs and potential environmental disasters due to poor upkeep.

At Eastcoast SiteWork we specialise in pond maintenance so your retention and detention ponds work effectively and are compliant with stormwater management regulations. Whether you are a homeowner, developer or contractor follow a maintenance plan and avoid costly repairs and environmental issues.

What is a Retention Pond?

A retention pond, also known as a wet pond or stormwater management pond, is a permanent, water-filled basin designed to capture and treat stormwater runoff. Unlike detention ponds, which temporarily hold water, retention ponds maintain a constant water level. These ponds collect and store runoff, allowing pollutants and sediment to settle at the bottom. Over time, cleaner water gradually seeps into the surrounding environment or exits through a controlled outlet. Retention ponds are commonly found in residential communities, commercial properties, and industrial areas, playing a crucial role in stormwater management.

Why Retention Pond Maintenance is Important for Stormwater Runoff

A maintained retention pond will prevent flooding, erosion and water pollution. Over time sediment, organic matter and invasive plants will reduce the ponds effectiveness causing drainage issues and making it harder to meet regulatory requirements.

Maintaining pond embankments is crucial to prevent issues like sediment buildup and invasive species growth, which can negatively affect both the appearance and structural integrity of the embankments.

Neglecting maintenance can lead to clogged inlet and outlet structures, water overflowing and weakened pond banks, all of which can result in costly repairs. The Environmental Protection Agency (EPA) have found that sediment can reduce a stormwater pond’s capacity by up to 50% in 20 years. This means regular sediment removal is essential to keep the system working.

Benefits of Well-Maintained Retention Ponds

Well-maintained retention ponds offer numerous benefits to local residents and construction companies alike. By collecting and storing excess stormwater runoff, they help prevent flooding and erosion. These ponds also improve water quality by treating stormwater runoff, thereby reducing the risk of downstream pollution. Additionally, well-maintained retention ponds can enhance property values, improve aesthetics, and provide habitats for wildlife. Keeping these ponds in good condition ensures they continue to serve their vital functions effectively.

Stormwater Runoff Management

Effective stormwater runoff management is a critical aspect of retention pond maintenance. Stormwater runoff can carry pollutants, sediment, and debris into retention ponds, negatively impacting water quality and ecosystem health. Implementing best management practices (BMPs) such as vegetation control, sediment removal, and erosion control is essential. Regular inspections and maintenance of retention ponds ensure they function properly and effectively manage stormwater runoff. By staying proactive, property owners can prevent potential issues and maintain the health of their ponds.

Retention Pond Maintenance Checklist

Check the Pond Regularly

Regular checks allow homeowners to pick up on minor issues before they become major problems. A stormwater management pond should be checked every 3-4 months with additional checks after heavy rain to ensure that drainage systems are effectively managing water levels and preventing overflow.

During a check look for blockages in the inlet and outlet structures, areas of weeds growth and signs of erosion along the pond banks. Check for water standing as this can indicate poor water flow and drainage issues. Also check the pond liner is intact as damage can cause leaks and water loss.

Weed Control

Weed control is a vital part of maintaining retention and detention ponds. Some plant life is beneficial for stabilising banks and filtering contaminants but overgrowth can block water flow and add to organic matter.

To prevent these issues remove weeds from pond banks and around the pond. Mow the surrounding area and trim back trees and shrubs to maintain access and prevent roots from damaging the pond liner. Regular weed control will also reduce the risk of algal blooms which can deplete oxygen and degrade water quality.

Keep the Drainage Clear

A retention pond relies on a working drainage system to control water flow. If the inlet and outlet structures become blocked with debris, sediment or rubbish the pond may not drain and flood.

Drainage systems play a vital role in managing stormwater effectively and preventing overflow, which is crucial for maintaining healthy ecosystems and protecting infrastructure.

To keep the drainage working remove leaves, litter and organic matter from the inlet and outlet structures. After heavy rain check the water is flowing freely through the pond’s system. Any signs of overflowing, stagnation or backflow should be addressed straight away to prevent bigger structural issues.

new jersey retention pond professional maintenance

Sediment Management

Over time sediment removal is required to maintain a maintained retention pond. When soil, sand and organic matter settles to the bottom it reduces the pond’s ability to store and filter stormwater runoff. If sediment levels get too high the pond may overflow and flood and erode.

Most retention ponds require sediment removal every 5-15 years depending on soil type and storm frequency. If the water level is higher than normal or drainage is slow then the pond may need to be dredged to restore its depth and function.

Erosion and Bank Stability

Pond embankments can weaken the overall structure of a stormwater management pond and cause failures if not properly maintained. This can be caused by uncontrolled water flow, lack of vegetation, or poor soil stabilisation.

To prevent erosion, reinforce the pond embankments with erosion-resistant vegetation or install rock (riprap) around the water’s edge. If soil is displaced, take corrective action straight away to prevent further deterioration. Regularly check the embankments to ensure long-term stability of the pond and to maintain stormwater management compliance.

Water Quality and Algae Growth

A healthy stormwater pond should have clear water with minimal algae growth. Poor water flow, nutrient runoff, and stagnant conditions can all cause algae blooms and poor water quality.

To keep the water clean, consider installing an aeration system to improve oxygen circulation. Don’t over-fertilize the surrounding landscaping as nutrient runoff can feed the algae. Remove organic matter like leaves and grass clippings to keep the pond’s ecosystem balanced.

If algae or poor water quality persists, then professional treatment may be required to get it back in balance.

Inlet and Outlet Structure Maintenance

Inlet and outlet structures are critical components of retention ponds, essential for ensuring proper water flow and preventing erosion. Inlet structures, such as culverts and pipes, direct stormwater runoff into the pond, while outlet structures, like weirs and spillways, control the release of water from the pond. Regular maintenance of these structures involves inspecting for damage, cleaning out debris, and repairing or replacing parts as needed. Keeping these structures in good condition is vital for the overall functionality of the retention pond.

Repair or Replace the Pond Liner When Necessary

The pond liner is the barrier that prevents leaks and ensures water retention. If the liner is pierced, cracked or damaged the pond will lose water or not be able to manage stormwater runoff.

Regular checks can help detect early signs of liner damage. If small punctures or tears are found they should be repaired straight away to prevent further deterioration. If the liner is badly damaged then replacement may be required to get the pond back to full function.

Biodiversity and Ecosystem Management

Biodiversity and ecosystem management are key components of retention pond maintenance. These ponds can support a wide range of plant and animal species, and maintaining biodiversity is crucial for ecosystem health and resilience. Effective ecosystem management includes practices such as vegetation control, sediment removal, and erosion control, along with monitoring water quality and wildlife populations. By fostering biodiversity and maintaining ecosystem health, retention ponds can provide numerous benefits, including improved water quality, enhanced aesthetics, and increased property values.

Professional Pond Maintenance

While routine checks and minor maintenance can be done by property owners, professional services ensure retention and detention ponds are fully functional and compliant with stormwater management requirements. At Eastcoast SiteWork we offer full pond maintenance services:

Regular inspections and compliance monitoring to meet local regulations
Sediment removal and dredging to restore pond capacity
Vegetation control to prevent overgrowth and blockages
Erosion control to reinforce pond banks
Inlet and outlet maintenance to keep the drainage system clear

By maintaining your stormwater management pond regularly you can extend its life, reduce repair costs and improve stormwater efficiency.

Prevent Common Problems

A retention pond is part of stormwater management but without proper maintenance it will fail quickly. Follow this retention pond maintenance checklist to prevent common problems like sediment buildup, poor water flow and erosion.

If you need professional care for your pond Eastcoast SiteWork can help. With years of experience in pond maintenance, erosion control and stormwater management our team can provide a solution for your stormwater ponds.