Reducing Stormwater Runoff and the Use of Deicing Chemicals

Pervious Pavement: What is it? 

Pervious pavement is a system for reducing stormwater runoff, ensuring less pollutants enter our waterways, as well as reducing the use of deicing chemicals during winter storm events.  These practices provide a strong, solid surface that can be installed on driveways, walkways, and patios.

Three of the most widely used materials are :

1. Permeable interlocking concrete pavement (PICP)
2. Pervious concrete (PC) and
3. Porous asphalt.

How does it work?

These practices allow stormwater to drain between the open joint sections found in the interlocking concrete pavers; the pore space of pervious concrete; and through porous asphalt.  The large gravel area installed beneath these pavements allows water to drain slowly underground.  As a result, stormwater runoff is reduced and pollutants are filtered before they reach our local waterways.

What happens when it snows? 

Pervious pavement removes the need for chemicals for ice melting. The air space created by the underground stone layer keeps the surface temperatures high. Removing snow to one inch allows for snow to melt and no ice to form.

Why is this important?

Deicing chemicals are an environmental concern. They are often toxic to animals living in fresh water and can harm plants.  As snow and ice melt from conventional paved surfaces, these chemicals enter our storm drain system and into our local streams.

And the main maintenance activity is keeping your pervious pavement debris free. Prolong the life of your pervious pavement and save on maintenance costs by regularly removing any debris from the surface.

Consider using these environmentally friendly “work horses” if renovating or installing a new paved surface at your house or commercial property.  There are many products available, shapes and colors, to meet the visual appeal for everyone. And don’t forget, always hire a licensed contractor.

You too can help protect our local waters!

Additional information: 

• Non-profits organizations can apply for grants to install these practices. More information can be found at: https://www.montgomerycountymd.gov/water/education/grants.html
• Rebate information for retrofitting your existing paved surfaces can be found at: https://www.montgomerycountymd.gov/water/rainscapes/index.html. Please check the site for most up to date information including application acceptance dates.
• And don’t forget to be Salt-wise at home.