Permeable Surfaces vs. Non-Permeable Surfaces: Understanding the Difference

Why Permeable Surfaces Are Becoming the Preferred Choice

With the increasing urbanization, more attention has been paid to the impact of pavement material on the environment. One of the factors to look at in this respect is permeable and non-permeable paving material. Understanding these two types of paving material is crucial in creating good drainage, reducing flood risks, and making sustainable environments outdoors.

As mentioned in the article provided by ProFlow Pavers, there is a lot to consider in choosing between these two paving options.

What Is A Permeable Surface?

A permeable surface is one that allows water and air to pass through the surface and enter the ground. Instead of collecting water in storm sewers, the mechanism used is similar to the process of absorbing water naturally in which the rainwater passes through the paving material to the ground below.

Here are some of the permeable surfaces:

• Permeable pavers

• Gravel path

• Porous concrete

• Porous asphalt

• Open-jointed paving systems

These permeable surfaces are often laid over an open-graded aggregate base to serve as temporary storage of water until it is released gradually into the soil.

Definition of Non-Permeable Surfaces

Non-permeable surfaces are impermeable surfaces which do not allow water to go through them; the water falling over these surfaces runs over them and is channeled into the drainage systems.

Some examples of non-permeable surfaces are:

• Traditional concrete surfaces

• Asphalt surfaces

• Stone surfaces which have been sealed

• Mortared patios

• Paving systems

These kinds of surfaces are tough but there can be some negative impacts on the storm water drainage system of the city because of these surfaces.

Benefits of Permeable Surfaces

Storm Water Management

The most important benefit of having Permeable Surfaces is that storm water management can be easily managed using them. Instead of letting rainwater accumulate and runoff, these surfaces help the water infiltrate the soil beneath them.

Recharging of Underground Waters

The underground waters are important to all ecosystems. The ability of the permeable pavement to allow water to infiltrate into the soil helps in recharging the underground waters.

Reduction of Water Contamination

Non-permeable pavements often have runoffs that carry with them different forms of pollution including oils, trash, fertilizers, and sediment. The permeable system filters rainwater, thus minimizing contamination of water sources.

Reduction of Urban Heat Effect

Ordinary pavements absorb heat and release it, which increases temperatures. Permeable pavements are cool since there is natural evaporation of water through the system.

The Role of Permeable Pavers

In recent times, there are a number of permeable systems available, and permeable pavers stand out among these options. These paving systems incorporate larger joints or specially made holes through which water can get into the aggregate base below the pavement.

The advantages in design offered by permeable pavers make them appropriate for:

• Residential driveways

• Patios

• Walkways

• Parking facilities

• Public places

• Commercial landscapes

Permeable pavers have been selected by property owners due to their functionality and good looks since they offer a way for water management through paving surfaces as opposed to the typical drainage systems which are always underground.

The Importance of Proper Installation

For the best results from the most durable paving materials, it is important that these systems are properly installed. For the effectiveness of permeable surfaces, installation and base layers play a big part.

According to industry professionals and ProFlow Pavers, permeable paving systems should always be installed over open-graded aggregate layers. Installing them on impermeable layers can affect their performance adversely.

The usual process of installation involves:

• Open graded aggregate layers

• Geotextile fabric when necessary

• Proper joint spacing

• Right site grading

• Meeting local stormwater regulations

Choosing the Right Surface for Your Project

Selection of either permeable or non-permeable paving surfaces will depend on the objectives of the project, among other factors.

There will be cases where permeable surfaces will be favored due to;

• Necessity of stormwater management

• Necessity of sustainability objectives

• Recharge of ground water

• Necessity to prevent flooding

• Implementation of green building

While there may be cases where non-permeable surfaces will still serve better, especially where water needs to be contained fully or where special construction requirements exist, many projects are opting for the use of permeable surfaces.

Conclusion

Contrary to popular belief, the distinction between permeable and non-permeable paving surfaces goes far beyond aesthetics. There are many benefits associated with the use of permeable surfaces when it comes to water management, environmental conservation and sustainability. These surfaces facilitate rainwater infiltration and help manage water runoff and recharge of underground water reserves.

As pointed out by ProFlow Pavers, contemporary pavements are designed to offer good performance and at the same time conserve the environment.