(a) Natural Land Use. Subdivisions should be planned to take advantage of the topography of the land to economize in the construction of drainage facilities, to reduce the amount of grading, and to minimize destruction of trees and topsoil.
(b) Land Suitability. If the Planning Commission finds that land proposed to be subdivided is unsuitable for subdivision development due to flooding, inadequate drainage, soil and rock formations with severe limitations for development, susceptibility to mud slides or earth slides, severe erosion potential, unfavorable topography, inadequate harmful to the health, safety or welfare of the future residents of the proposed subdivision or community; and if from investigations conduced by the public agencies concerned, it is determined that in the best interests of the public the land should not be developed for the purposed of the proposed, the Planning Commission shall not approve the land for subdivision unless adequate methods are advanced by the subdivider for solving the problem that will be created by the development of the land.