A channel drain gate is the slotted cover for a drain gutter. The gutter and grate are used in combination for draining water from surface areas like driveways and porches, where there will be vehicle or heavy foot traffic. The drain gutter is installed below level of the surface. The drain grate is then placed over the drain gutter to allow water to channel into the drainage system. This system
. directs water flow away from the areas you want to protect. More information about drain grates can be found here http://www.plastictrenchdrain.com/?p=16.