A preliminary grading and drainage system plan shall be part of the preliminary plat. It shall indicate, in general terms, a proposal for an adequate system of drainage structures to carry off and store or discharge the storm water run-off and natural drainage water which originates not only within the property boundaries, but also that which originates beyond property boundaries. The use of vegetated swales as an adequate system of drainage, in lieu of inlets and pipes, may be allowed, as deemed appropriate by the Board Engineer based upon specific site conditions.

Drainage structures which are located on State or county highways rights-of-way shall be approved by the State or county highway engineer's office, and a letter from that office indicating such approval shall be directed to the chairman of the board and shall be received prior to the final plat approval rights-of-way shall be approved by the State or county engineer's office, and a letter from that office indicating such approval shall be directed to the chairman of the board and shall be received prior to the final plat approval.

The public improvement and utility plans and profiles shall show the final drainage plan and street profiles. They shall be prepared and submitted with the final plat after the approval of the preliminary plat and drainage plan.

No storm water run-off or natural drainage water shall be so diverted as to overload existing drainage systems or create flooding or the need for additional drainage structures on other private properties or public lands without proper and approved provisions being made for taking care of these conditions.

The drains or culverts shall consist of sections of cast iron, reinforced concrete pipe or asbestos cement storm pipe. All pipe shall comply with the requirements of the current New Jersey State Highway Department Specifications governing materials.

The location, length, depth, grade, type and the size of pipe shall be installed as indicated on the approved plans except where unusual or exceptional soil or other conditions are discovered at the time of construction which are not provided for in the plans, in which case such construction shall be determined by the Borough Engineer. Trenches shall be bridged at all street crossings, intersecting streets and public and private entrances in such a manner that traffic will not be interrupted.

The contractor shall have a sufficient quantity of timber and equipment constantly on hand for planking, sheet piling, fencing or shoring, and adequate pumping apparatus to meet all requirements of construction for use in case of accident or emergency.