Not more than 50% of any water areas such as lakes, ponds, streams, swamps, or brooks shall be recognized in this computation, to assure compliance with the requirements for usable open space for all purposes and pursuits. In determining the area of any of the aforesaid water area, flood plans and areas where the seasonal high water table reaches zero to one foot shall be deemed to be included in such water area.

Areas not considered as open space. Open space land in satisfaction of subsection 13-7.2c shall not include yard areas, land area within the right-of-way of public or private streets, and land area between walkways and buildings wherein the principal use of the land is to provide for pedestrian traffic to and from buildings.

Development of seasonal wetlands. Areas within the M-R zone where the seasonal high water table reaches zero to one foot, as established by county conservation service, shall not be included in any development for any purpose or to satisfy any requirement, except as provided in subsection 13-7.11a.