(a) Easements shall be provided on both sides of all drainage ditches, channels, creeks, streams or open watercourses. The width of drainage easements shall be sufficient to provide for access to the drainage course. It shall be wide enough for its reasonable protection, widening, deepening, realignment or enclosure.
(b) Easements for required improvements may be located outside of the street right-of- way. The location and size of these easements must take into consideration that these required improvements may have to be periodically maintained, repaired or replaced. The location and size of easement must also be evaluated in terms of the public health and general welfare.