As used in this article, unless used in a context that clearly requires a different meaning, the term:
(a) "Alterations" or "repairs" means only those changes in the structure or integrity of a dam that may affect its safety to be determined by the secretary.
(b) "Application for a certificate of approval" means the written application provided to the secretary requesting that a person be issued a certificate of approval.
(c) "Appurtenant works" means any structure or facility that is an adjunct of, or connected, appended or annexed to, a dam, including, but not limited to, spillways, a reservoir and its rim, low-level outlet works or water conduits such as tunnels, pipelines and penstocks either through the dam or its abutments.
(d) "Authority" means the Water Development Authority provided in section four, article one, chapter twenty-two-c of this code.
(e) "Certificate of approval" means the written approval issued by the secretary to a person who has applied to the secretary for a certificate of approval that authorizes the person to place, construct, enlarge, alter, repair or remove a dam and specifies the conditions or limitations under which the work is to be performed by that person.
(f)(1) "Dam" means an artificial barrier or obstruction, including any works appurtenant to it and any reservoir created by it, which is or will be placed, constructed, enlarged, altered or repaired so that it does or will impound or divert water and:
(A) Is or will be twenty-five feet or more in height from the natural bed of the stream or watercourse measured at the downstream toe of the barrier and which does or can impound fifteen acre-feet or more of water; or