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Section 17-46 Ground elevations.
The preliminary plat shall show ground elevations, based on the datum plane of the U.S. Coast and Geodetic Survey (or a datum plane approved by the city engineer): (1) For land that slopes less than approximately two (2) percent, show spot elevations at all breaks in grade, along all drainage channels or swales, and at selected points as necessary to show drainage. (2) For land slopes more than approximately two (2) percent, show contours with an interval of not more than five (5) feet. (Code 1958, 20A-603)
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