§ 9-03. Drainage.

9-03.1. Provision of plans. The subdivider shall provide all necessary information needed to determine what improvements are necessary to develop the subject property properly, including contour intervals, drainage plans and calculations. The subdivider shall also provide plans for all such improvements together with a certified engineer's statement that such improvements, when properly installed, will be adequate for proper drainage. The subdivider shall also provide information pertinent to off-site drainage required by the director.

9-03.2. Storm sewer and streams. The drainage system shall include all storm sewers, natural streams, curb drop inlets and other drainage structures. All existing open ditches, except ravines, creeks, and canals, shall be piped with approved materials in accordance with the provisions of the City of Newport News sewerage and/or drainage improvement program. Drainage systems shall be designed on the basis of a minimum storm frequency of ten (10) years. A drainage system design based upon a storm frequency greater than ten (10) years may be required where there are extreme risks of flooding as determined by the director and/or described in the City Design Criteria Manual adopted by [the] city council.

9-03.3. Curb inlets. Curb drop inlets shall be installed at street intersections and at such intermediate locations as required to collect surface water. Such inlets shall be connected to an approved storm sewer. When it is necessary to convey drainage through a lot or along lot lines, storm sewers connected to the street storm sewers, or other storm sewers approved by the director, shall be installed along such lines.

9-03.4. Sub-drains. Sub-drains shall be installed where it is apparent that underground water will be detrimental to the street paving and accessory structures.

9-03.5. Final authority. The director shall in every case have the final authority to determine what shall be adequate with respect to drainage and storm sewer facilities within a subdivision.

(Ord. No. 7501-18)

(Ord. No. 7501-18)