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Originally posted by gariac
You probably missed the image link. I cranked up the contrast a bit more. It looks to me like a landing of some sort, then perhaps stairs to the ground. The solid part doesn't go all the way to the ground. It could be a fire escape or some sort of service access.
Originally posted by gariac
In more "normal" places (as in not the desert), they put a detention basin to catch the dirt (silt) that is carried off with the water, then there is a drainage path to dump the water into a stream. [By retaining some water before allowing it to flow, it reduces the storm surge.] But in the desert, they just dig the basin and that is that. I assume they figure the water will just evaporate and/or flow into the ground.