The subdivider shall provide the subdivision with an adequate storm water sewer system. When the surface drainage is adequate, easements for such surface drainage shall be provided. The construction of a storm drainage system shall conform to the following requirements:
A. Each lot shall have its own individual storm sewer tap. No downspouts shall connect to any storm drainage system and flow from said downspouts shall not drain onto the adjoining lot or parcel of land.
B. Drainage piping serving drain tile that is located below the catch basin of the main storm sewer shall discharge into an approved water-tight sump or receiving tank, so located as to receive the water by gravity. From such sump or receiving tank, the water shall be lifted and discharged a minimum of twenty-four (24) inches above the catch basin level of the main storm sewer and flow by gravity to the [catch basins].
C. Catch Basins shall be designed to prevent ponding of storm water within the street right-of-way for a storm frequency of ten (10) years.
D. Drainage ditches or channels shall be designed to prevent erosion of the ditch and shall have a minimum design velocity (slope) of two feet (2') per second.
E. All lot elevations as stated in the plans shall be maintained by the subdivider, builder and any subsequent owners of the lot. No elevation shall be altered unless approved by the Town Engineer.
F. Rear yard drains shall be provided to prevent ponding in the rear yard areas and shall be connected to an enclosed storm drainage system.
G. The subdivider shall be required to clean and maintain any mutual drains which are utilized for the storm drainage of subdivision, as required by the Town, in accordance with the standards and requirements of the Town, prior to the acceptance of the storm drainage system.
H. The subdivider shall clean the storm drainage system and maintain the same in accordance with the standards and requirements of the Town, prior to the acceptance of the storm drainage system by the Town.
I. If there are any open watercourses, they shall have adequate capacity and erosion control to insure safe and healthful disposal of storm water.
J. When top soil has been removed from the surface of a lot on a slope where erosion will cause a displacement of loose materials, the subdivider shall be required to seed or provide other means to prevent the wash from damaging adjacent property or accumulation on street surfaces.
(Ord. No. 1095, § VI-4, 12-14-88)