Want to create a six to twelve inch wide porous concrete strip about thirty feet long in our backyard over a drain pipe. Normal concrete is porous but the concrete i want is extremely porous. So porous in fact that you could pour a 5 gallon bucket of water on it and it goes directly thru the concrete. Extremely porous concrete is not as strong especially for heavy vehicles, but i will not have vehicles and the strip would be no more than a foot wide. Is there a name for this type of concrete?
Why? We have 3 "shower" drains six inches in diameter to drain a concrete backyard. The problem is the drains clog easily with leaves and other natural debris blown around in a storm. A downpour may leave inches of standing water in our backyard. A strip of concrete should not clog.
There already is a pipe that drains the water away, but that would need to be a half pipe, right? How would you form the porous concrete so that it drains into the half-pipe? Is there a recommended impervious underlayment for the porous concrete that would direct water into the drain pipe?