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AN ORDINANCE TO AME~D CHAPTER 32 OF THE CODE OF THE CITY OF PORTS- MOUTH, VIRGINIA, 1961, SUCH CHAPTER BEING THE SUBDIVISION ORDINANCE OF THE CITY OF PORTSMOUTH, BY ADDING SECTION 32-19.1 THERETO PER- TAINING TO REQUIRED OFF-SITE DRAINAGE IMPROVemENTS. Be it ordained by the Council of the City of Portsmouth, Virginia: 1. That Chapter 32 of the Code of the City of Portsmouth, Virginia, 1961, be amended by adding thereto Section 32-19.1, such section to read as follows: Section 32-19.1. Off-site drainage improvements. Whenever the subdivisio~ or development of land may cause or contribute to the need for off-site drainage facilities (facilities other than those required to provide internal drainage within the subdivision or development) to control the flow of storm water, the subdivider shall be required to provide for or contribute to the installation of such facilities in one or both of the following manners A. Construct such off-site drainage facilities in accordance with plans and specifications ap- proved by the city engineer. Construction by the developer shall be undertaken only if per- mitted by the city engineer. The subdivider shall pay the cost or so much thereof as the city shall direct. B. Contribute his pro rata share of the costs of such facilities as are needed to properly control storm water flow in a designated drai~- age area, said share to be calculated as follows: (1) Drainage area~ shall be designated b~ the city engineer in accordance with soun~ engineering principles. (2) Off-site drainage facilities needed to properly control present and anticipated storm water flow in such areas shall be de- signed by the department of engineering in accordance with sound engineering principles taking into consideration (among other things) the zoning and zoning patterns of the subject drainage area, the duration and frequency of rainfall in such area during a storm return