The term “waterworks” as used in sections 40:62-109 to 43:62-150 of this title means and includes one or more systems of waterworks, whether or not such waterworks extend into or supply water in other municipalities than those proposing to acquire or owning the same, and waterworks, rights and franchises owned by one or more persons and shall include rights and franchises to obtain an additional supply of water, and any or all other appurtenant property of such owner or owners.