Do You Know The Differences? Detention vs. Retention Ponds Explained

At some major developments, you can find detention and/or retention ponds. While these terms may be used interchangeably, these ponds actually serve two distinctly different purposes. 

These are also referred to as dry extended detention ponds and wet detention basins.

In this article, we’ll take a closer look at detention vs. retention ponds, review the differences, and outline the pros/cons of each one.

However, it’s vital to note that these are just two of many ways to manage and control storm water. At Ballentine Associates, we’re extremely familiar with all the storm water control measures (SCM) methods and techniques, following state and federal regulations to the letter.

Detention vs. retention ponds are merely features that are only one part of a much more extensive and comprehensive toolkit for treating stormwater. 

When you work with us, you’ll discover that we focus not only on the big picture, but every minute detail as well. We’ll also review some of these other methods and techniques later in the article. 

At Ballentine Associates, we strive to be much more than a mere vendor. Relationships are at the heart of all we do, because we believe this is the best way to help you achieve your goals while, at the same time, ensuring even the slightest detail is not overlooked. 

We do not compromise on our core values of integrity, service, and results. You’ll discover why so many developers in the Triangle and surrounding counties trust us with their projects, no matter what scope or size. Interested in learning more about our services? Just speak with us. All you have to do is complete a simple form to begin the conversation. We look forward to meeting you!

Detention vs. Retention Ponds: What’s the Difference?

Retention Ponds

These may also be referred to as wet ponds or water retention ponds. A retention pond has a permanent pool of water throughout the year. Its purpose is to improve water quality by enabling sediment settling and nutrient removal using plants. 

• Through settling sediment, pollutants can sink to the bottom of the pond. This prevents them from flowing downstream.
• In addition, plants naturally clean up the pond because they can serve as natural filters. 

These methods prevent pollutants from moving downstream into other aquatic areas.

Detention Ponds

By contrast, detention ponds (also referred to as dry ponds) are primarily used to temporarily store stormwater runoff. After storing the runoff, it can be released until it drains completely, not unlike a bathtub. This means that, unlike retention ponds, these typically do not maintain a permanent pool of water throughout the year.

Next, let’s take a closer look at the advantages and disadvantages of detention vs. retention ponds.

What Are the Advantages/Disadvantages of Retention Ponds?

Retention Ponds: Advantages vs. Disadvantages

What Are the Advantages/Disadvantages of Detention Ponds?

Detention Ponds: Advantages vs. Disadvantages

What Are Other Stormwater Control Measures (SCM’s)?

As we mentioned earlier, dry ponds and wet ponds are only a few methods of stormwater control. At Ballentine Associates, our experienced engineers will review all data and recommend the SCM that is most appropriate for the situation.

Other types of SCM’s include:

• Infiltration systems, which are able to capture water so it will soak into the ground. The two types are infiltration basins and infiltration trenches.
• Bioretention cells, which are landscaped depressions utilizing natural vegetation to treat water through a blended approach. These cells are very versatile and can be used in a variety of soil and site types. 
• Stormwater wetlands, which are recreations of natural wetlands, utilizing plants as natural filters.
• Permeable pavement, a specialized kind of pavement that water can pass through as opposed to running off. Water is stored temporarily in a stone layer, where it can then infiltrate into the ground and/or be released slowly. 
• Sand filters, where stormwater passes through sand so any pollutants can either be trapped or filtered out of the water. 
• Rainwater harvesting: By capturing rainwater from various surfaces (such as roofs) and storing it for later use, it can be later used for non-potable situations, such as toilet flushing or irrigation.
• Filter strip, which is a vegetated strip that receives concentrated stormwater flow that comes from a wider area.
• Disconnected impervious surface, where water is directed into a vegetated area so it can be naturally filtered by plants or soil before it continues to run off. 
• Treatment swales are like ditches, but are highly engineered to convey water while treating it at the same time.
  
  

Not Sure Which SCM Is Right for You? Our Experts Have the Answers

No conversation about a detention vs. retention pond would be complete without listing all the other facets of stormwater treatment and control. The right choice can make a significant difference. There are multiple factors to consider, and you need engineers and experts who will work with you to guide you to the right decision.

Because we believe in establishing relationships with our clients, we have many loyal clients in sectors ranging from industrial complexes to housing developments to mixed-use/commercial projects. (Take a quick look at our portfolio to discover more.)

We would love the opportunity to learn more about your project. Let’s start the conversation. All you need is to complete a short, simple form.