General design. In the design of a subdivision, land division, planned
unit development or certified survey, provision shall be made for
suitable sites of adequate area for open space uses. Such sites are
to be shown on the preliminary plat and final plat. Consideration
shall be given to the preservation of scenic and historic sites, stands
of trees, marshes, lakes, ponds, streams, watercourses, watersheds,
ravines and woodlands, prairie and wetlands, and plant and animal
communities.