Unless otherwise expressly stated, the following terms shall, for the purpose of this chapter, have the meanings indicated:
A. Words in the singular include the plural, and those in the plural include the singular.
B. Words used in the present tense include the future tense.
C. The words "person" or "subdivider" and "owner" include a corporation, unincorporated association and a partnership, or other legal entity, as well as an individual.
D. The word "building" includes "structure" and shall be construed as if followed by the phrase "or part thereof."
E. The word "watercourse" includes channel, creek, ditch, dry run, spring, stream and river.
F. The words "should" and "may" are permissive; the words "shall" and "will" are mandatory and directive.