A parallel plan shall be submitted to the reviewing authority in order to establish the maximum permitted density. The parallel plan shall identify how a parcel could be developed under the conventional standards of the specific zoning district in which the property is situated, and the requirements of all other applicable state and Township regulations and standards. The parallel plan shall provide lots with building envelopes of sufficient size, taking into consideration sanitary sewage disposal capacity, topography, easements or encumbrances, drainage retention/detention areas, along with all necessary roads and road-related improvements, without impacting natural areas and features required to be preserved under applicable law and ordinance. All unbuildable areas and areas with limitations to development must be accurately identified on the parallel plan, including, but not limited to, wetlands, watercourses, drains, floodplains, steep slopes, woodlands and similar features. It is not the intent of this provision to generally require detailed engineering in the preparation of this plan; however, it must be a realistic plan of development, taking into consideration the actual assets and constraints of the property.