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Please add an option to input the surface slope and formation level slope for the permeable pavements to represent the varying depth of storage below. This is one of the 3 options we use at steeper sites to provide adequate storage in permeable pavement. The same is the case with infiltration trenches as well where the surface slope, formation slope and the under-drain slopes are not necessarily the same. Also, the length of under-drain pipes in permeable pavements is not always the same as the length of the pavement. We sometimes use diffusers and a small length of pipe to collect the flows. It would be good if you could consider these two suggestions.
