1. A drainage system adequate to serve the needs of the proposed new streets or the entire subdivision will normally be required in new subdivisions. When a public storm sewer main is available at the plat boundary or within 1,000 feet, the subdivider shall construct a storm sewer system and connect with such storm sewer main.
2. Bridges or culverts shall be designed and constructed by the subdivider where natural drainage intersect any street right-of-way.
3. Where open watercourses are planned, adequate safety, erosion control, drainage (stagnant water), protection of capacity and appearance measures shall be taken by both the subdivider and the Planning Commission to ensure proper, safe, healthful disposal of stormwater.
4. Minimum grade of drainage courses shall be designed to create a cleaning effect (velocity of five feet per second) except that a minimum cleaning effect (velocity of three feet per second) may be permitted by the Township Engineer where greater grade cannot be achieved.
5. At intersecting streets, water in gutters and ditches shall be placed in adequate culverts.
6. Location of storm sewers shall be in accordance with existing systems or in accordance with standards suitable to the Township Engineer.
7. Storm sewers shall have a minimum diameter of 15 inches and a minimum grade of 0.5%.
8. Manholes shall normally be spaced 300 feet apart where pipe sizes of 24 inches or less are used and not over 450 feet where larger sizes are installed. Inlets may, if approved by the Township Engineer, be substituted for manholes.
9. Special sections of ten to 15 feet radii shall be installed where abrupt changes in direction are made.
10. Pipe culverts shall normally be required under driveways and shall not be less than 15 inches in diameter and 16 feet in length. Reinforced concrete or corrugated metal pipe may also be used and shall be laid so as to maintain the flowline of the open ditch.
11. All phases of construction of open ditches, gutters or storm sewers including width, depth, shape, erosion control, minimum grade, size and area shall be in accordance with the requirements of these regulations and all storm drainage facilities shall be inspected and certified by the Township Engineer prior to being covered.
(Ord. 1983-3, 12-12-1983, § 504)