Other than buildings, less than 10% of the property is paved with asphalt, concrete or other impermeable materials

 

What is this?

Does your property have a lot of open space with plants, or are there large portions of your property covered with hard surfaces such as asphalt or concrete?  You will receive 10 points if less than 10% of your property is covered with impermeable materials – surfaces that do not allow rainwater or snowmelt to soak into the ground. Some materials allow water to soak right through. Examples of rain-permeable materials include: crushed gravel, porous pavers, stone/brick pavers, porous concrete and permeable asphalt.

How do I do this?

On my own

When possible, design your property with a reduced amount of asphalt or concrete and use rain-permeable materials when replacing or installing new driveways, walkways, and patios.

  1. As you research various materials, ask about winter issues – snow shovelling/plowing, frost heave and the impact of salt or other de-icing agents.
  2. Here are somelaces to see interesting surfaces to consider:
    • Ryerson Woods in Deerfield has a porous asphalt parking lot
    • The Morton Arboretum in Lisle features an interlocking paver parking lot.
    • The Prairie Crossing Charter School in Grayslake features a section of permeable recycled glass sidewalk.
    • The Village of Oak Park has installed a number of beautiful, low-maintenance brick streets.

Hire some help

See our local vendors for sources of permeable paving.

Why is this important?

  • It’s helpful if you can prevent stormwater from running off your property and flowing into our lakes and streams. This reduces local flooding and water pollution.
  • Historically, open spaces such as prairies, savannas and oak woodlands dominated the landscape of northern Illinois. These valuable natural areas filtered rainwater and snowmelt which drained into our numerous lakes and streams.
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