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AN ORDINANCE AMENDING THE CODE OF GINIA, 1973, BY AMENDING SECTION DRAINAGE iMPROVF2~ENTS - THE CITY OF PORTSMOUTH, VIR- 33-56 PERTAINI~G TO OFF~SITE BE IT ORDAINED by the Council of the City of Portsmouth~ Virginia: 1. That Section 33-56 of the Code of the City of Portsmouth, Virginias be reordained and amended to read as follows: Section 33-56. Off-site drainage improvements. ~enever construction of a sub~ivisionr development or improvement of land may cause~ contribute or add to off-site drainage (facilities other than those required to provide in- ternal drainage within such construction), such subdivider, developer or improver shall provide for or contribute to the installation of new off-site drainage facilities or pay his pro rata share for off-site drainage facilities previously constructed as provided in one or both of the following manners: (a) Construct such off-site drainage facilities in accordance with plans and specifications approved by the city engineer. Construction by the developer shall be undertaken only if permitted 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 drainage area~ said share to be calculated as follows: (!) Drainage areas shall be designated by the city engineer in accordance with sound engineering principles. (2) Off-site drainage facilities needed to properly control present and anticipated storm water flow in such areas shall be designed by the department of engineering in accordance with sound engineering principles taking into consideration (a~ong other things) the zoning and zoning pa%terns of the subject drainage area, the duration and frequence of rainfall in such area during a storm return period of five (5) years using U. S~ Department of Commerce curves and statistics and suitable run-of~-coefficients as determined by the city engineer for the different types of zoning in such area.