Reservoir adjectives are listed in this post. Each word below can often be found in front of the noun reservoir in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing RESERVOIR.
acre, artificial, big, central, circular, common, deep
elevated, enormous, grand, great, hidden, huge, immense
important, inexhaustible, infinite, large, larger, largest, little
lower, main, major, mighty, natural, new, old
potential, primary, proposed, rich, same, second, small
subterranean, underground, untapped, upper, vast
Hope this word list had the adjective used with reservoir you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.