Flash flood control is taken very seriously here. On the Giant Road Trip these wide and sculpted concrete constructions began to show up in southern Kansas, and continued through Oklahoma and Texas. Towns were designed to channel and survive occasional events when the dry arroyo turns into a mini-Amazon. Another way this showed up was in really long highway bridges over...nothing but scrub. Then you realize that in the right storm conditions, the bridge will span a raging torrent of a couple feet of water that would sweep cars, much less people, out of its path.