(A) General requirements. Where a subdivision is traversed by a watercourse, drainageway, channel or stream, there shall be provided a stormwater easement or drainage right-of-way conforming substantially to the lines of such watercourse, and of such width and construction, or both, as will be adequate for the purpose. Wherever possible, it is desirable that the drainage be maintained by an open channel with landscaped banks and adequate width for the maximum potential volume of flow.
(B) Drainage easements.
(1) Where topography or other conditions are such as to make impractical the inclusion of drainage facilities within the road rights-of-way, perpetual unobstructed easements at least 15 feet in width for such drainage facilities shall be provided across property outside the road lines and with satisfactory access to the road. Easements shall be carried from the road to a natural watercourse or to other drainage facilities.
(2) When a proposed drainage system will carry water across private land outside the subdivision, appropriate drainage rights must be secured and indicated on the plat.
(3) The applicant shall dedicate, either in fee or by drainage or conservation, the easement of land on both sides of existing watercourses to a distance to be determined by the Planning and Zoning Commission.
(4) Low-lying lands along watercourses subject to flooding or overflowing during storm periods, whether or not included in areas for dedication, shall be preserved and retained in their natural state as drainageways. Such land or land subject to periodic flooding shall not be computed in determining the number of lots to be utilized for average density procedure nor for computing the area requirement of any lot.
(Prior Code, § Q-12-1013)