Gutters/downspouts are not really needed unless you are looking to protect areas like entryways. Water flowing off roofs evenly onto the grass along its entirety will not create flooded out areas where a torrent comes out of a downspout. Since there are no basements, there is less need to move water away from a foundation like we did up north. Many people install gutters/downspouts (I believe) as they always had them up north.
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