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 runoff and natural drainage water which originates not only within the property boundaries, but also that water which flows onto the property boundaries from areas outside the project.

Drainage structures which are located on State or County highway 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.

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 runoff 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.

All drains and culverts shall consist of concrete pipe manufactured in accordance with ASTM designation C76, Class IV with "O" ring joints or such other materials approved by the Borough Engineer.