(a) Design Criteria. The following methods shall be used in designing the water quality, peak flow shaving and infiltration components of stormwater practices needed to meet the water quality standards of this Chapter:
(1) Technical standards identified, developed or disseminated by the Wisconsin Department of Natural Resources under Subchapter V of Ch. NR 151, Wis. Adm. Code.
(2) Where technical standards have not been identified or developed by the Wisconsin Department of Natural Resources, other technical standards may be used, provided that the methods have been approved by the Village Engineer.
(3) In this Chapter, the following year and location has been selected as average annual rainfall: Madison, 1981 (March 12 - December 2).
(b) Freeboard. The design top elevation within a pond shall be two (2) feet above any calculated one hundred (100) year floodplain elevation or one (1) foot above the adjacent emergency overflow.