Squat; dumpy.

short and thick; as e.g. having short legs and heavy musculature; "some people seem born to be square and chunky"; "a dumpy little dumpling of a woman"; "dachshunds are long lowset dogs with drooping ears"; "a little church with a squat tower"; "a squatty red smokestack"; "a stumpy ungainly figure"

One type of open meter proving tank or a filter, both being designed in a low silhouette.