(a) Whenever any stream or surface drainage course is located in an area that is being subdivided, the subdivider shall dedicate an adequate easement along each side thereof, for the purpose of widening, deepening, sloping, improving or protecting the same for drainage, parkway or recreational use. The official plan shall be used as a guide for such dedication.
(b) Easements of at least five (5) feet in width shall be provided on each side of all rear lot lines and along side lot lines, where sideline easements are necessary for poles, wires, conduits, storm and sanitary sewers, gas, water or other mains. Easements of greater width may be required along or across lots where necessary for the extension of main sewers or other utilities or where both water and sewer lines are located in the same easement. A two (2) foot easement shall be required on one side of an alley to accommodate pole lines.