Hi guys. What gradient do we need on an ACO drain along the side of a garage? It's a block paved narrow path. Approx' 7m long. Proposing to connect into a pre existing surface water drain.
One place I read 1 in 100, but that would mean a 7cm difference in height, which would look pretty odd against the block paving. Another said 1 in 200 and elsewhere said 1 in 300 was sufficient for a slope on a residential path. The block paving slopes slightly towards the side of the garage width ways, and maybe slightly towards the surface drain in some parts.
One place I read 1 in 100, but that would mean a 7cm difference in height, which would look pretty odd against the block paving. Another said 1 in 200 and elsewhere said 1 in 300 was sufficient for a slope on a residential path. The block paving slopes slightly towards the side of the garage width ways, and maybe slightly towards the surface drain in some parts.
