Currently preparing an area in our garden to lay a paved patio area and pergola (the latter being provided by a professional).
My wife and I need to build a supporting wall around the sides and at the top side (see the photo below).
We have been advised to create a 1% incline on the slabs, so that water can run off when it rains etc.
My question(s) is, how do you measure out/figure out how to do this? Is this a requirement when building a patio area? Is 1% the ideal incline?