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E; ~ installed and accepted by the city, except that final roadway surface need not be applied prior to issuance of such certificate if a suitable base and interim sealing agent acceptable to the city have been laid. G) A subdivider or developer ofland shall pay to the city the pro rata share of the cost of providing reasonable and necessary sewerage, water and drainage facilities located outside the property limits of the land owned or controlled by the subdivider or developer but necessitated or required, at least in part, by the construction or improvement of the subdivision or development, subject to the following: (1) No such payment shall be required until such time as the city shall establish a general sewer, water and drainage improvement program for an area having related and common sewer, water and drainage conditions and within which the land owned or controlled by the subdivider or developer is located. (2) Such share shall be limited to the proportion of such total estimated cost which the increased sewage flow, water flow and/or increased volume and velocity of stormwater runoff to be actually caused by the subdivision or development bears to total estimated volume and velocity of such sewage, water and/or runoff from the applicable area having an established general improvement plan as required by subsection (j)(1) ofthis section. (3) In lieu of any such payment, the subdivider or developer shall execute and file with the City Engineer an agreement and bond with surety, satisfactory to the city attorney, equal to the estimated costs, as established by the City Engineer, of such improvements conditioned upon payment at the commencement of construction of the facilities. An irrevocable letter of credit issued by a bank in a form approved by the city attorney may also be accepted under the same terms and conditions applicable to bonds. (4) Any payments received shall be kept in a separate account for each of the individually established improvement programs until such time as they are expended for the improvement program. Sec. 33.1-50. Off-site drainage. (a) New development. (I) A building permit will be issued by the building official for proposed construction of new development only after the City Engineer has determined that the additional off-site drainage flow from such proposed construction will not be a danger or hazard to an existing off-site drainage facility or property in the proposed construction sites' drainage basin. (Off-site drainage facilities are those facilities outside the property limits of the proposed construction site necessary to carry drainage flow from construction site to a drainage basin.) New open ditches or modification of existing ditches will not be permitted in areas zoned residential unless included in the city's master drainage plan. (2) The City Engineer will determine whether a hazard or danger exists from such additional off-site drainage flow by approved drainage computations furnished to the City Engineer by the permit applicant in accordance with the city's master drainage plan, existing field conditions and zoning required by City Council. Computations shall be based on a normal storm return period often years using U.S. Department of Commerce curves and utilizing applicable existing master drainage plans on file in the office of the City Engineer, or as adjusted by the city. Where reasonably necessary to protect public or private property, the City Engineer may require calculation of drainage flow and installation of improvements based on a normal storm return period of greater than five years. Page 30 of 33