I am currently working on a project of a newly constructed building with a ground-level deck flooding during heavy rain events. This area has some walkway surface-level drains that drain into stormwater plumbing. Then along the walkway edges, there is also a 10" wide strip of gravel along the concrete curb with a 10" subsurface drain in the concrete slab below the gravel. There are high points on either side of the subsurface drain acting like a trough. I am concerned this gravel above the drain in the trough is impeding the flow into the drain and could be causing the flooding of this area. Could this be the case and what would the stormwater infiltration rate be through the gravel? Stormwater and plumbing is not my specialty so any help is appreciated!
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