http://www.drains-services.co.uk/questions/how-much-is-drainage-inhibited-by-a-sand-base-mortarless-paved-walk/ Solving your Plumbing and Drains Problems Thu, 02 Aug 2007 08:19:25 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://www.drains-services.co.uk/questions/how-much-is-drainage-inhibited-by-a-sand-base-mortarless-paved-walk/comment-page-1/#comment-525 Martha Rothwell Sun, 24 Dec 2006 04:31:54 +0000 http://www.plumbing-care.co.uk/questions/how-much-is-drainage-inhibited-by-a-sand-base-mortarless-paved-walk/#comment-525 Water will not infiltrate through a mortar-less paved walkway as rapidly as grass. Many municipalities in Lake & Cook counties of Illinois perform calculations on the aggregate size of all impervious surfaces versus the total property area. Paver patios, walkways and driveways are included in these impervious surface area calculations but are typically deloaded by only 30% maximum. Another way to look at this is that these linear surface structures inhibit 70% of the water that falls in the form of rainfall. Again, in their view, it is the amount of run-off that occurs during a typical rain storm and not what is possible if you run a slow soaker hose over these surfaces. These surfaces do impede significant rainwater amounts at the rate that rainwater typically falls. Hope this is helpful. Water will not infiltrate through a mortar-less paved walkway as rapidly as grass. Many municipalities in Lake & Cook counties of Illinois perform calculations on the aggregate size of all impervious surfaces versus the total property area. Paver patios, walkways and driveways are included in these impervious surface area calculations but are typically deloaded by only 30% maximum. Another way to look at this is that these linear surface structures inhibit 70% of the water that falls in the form of rainfall. Again, in their view, it is the amount of run-off that occurs during a typical rain storm and not what is possible if you run a slow soaker hose over these surfaces. These surfaces do impede significant rainwater amounts at the rate that rainwater typically falls. Hope this is helpful.

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