What is Permeable Interlocking Pavement?
    
Permeable interlocking concrete pavement (PICP) is comprised of a layer of concrete pavers separated by joints filled with small stones. Water enters joints between solid concrete pavers and flows through an "open-graded" base, i.e. crushed stone layers with no small or fine particles. The void spaces among the crushed stones store water and infiltrate it back into the soil subgrade. The stones in the joints provide 100% surface permeability and the base filters stormwater and reduces pollutants.

Techo Bloc Channel - Permeable 
  http://www.youtube.com/user/techobloc#p/c/A913E44A0270950C

Permeable Pavers