We’ve talked about grass driveways before, but it looks like you can use these HardDrive panels from Presto Product systems without ripping out the soil and prepping the bed — instead you might be able to place ’em right over existing grass.
Molded from heavyweight recycled plastic, each 20″ by 40″ section will interlock with neighboring sections to create a driveway or walkway as large or as small as you need. The square openings allow grass to grow, while the plastic grid supports the weight. Since the driveway is mostly grass there’s about as much runoff as any other area of your lawn.
Although they can sell for as much as $4-5 a square foot — twice as expensive as drivable grass — doing less prep work probably makes the extra cost worth it. A 20″ by 40″ panel costs a little over $20, but we’ve seen them go on sale for $12.