Hereafter no acquisition of water rights shall be made or taken by any public water supply agency except as follows:
Any such public water supply agency desiring to acquire new water rights, a new source of water supply, or to acquire an additional quantity of water or water rights from an existing source of water supply, beyond that confirmed by the board under the preceding sections of this act as being reasonably necessary for present purposes and future needs, shall make application to the board for a permit to acquire such designated waters or water rights, setting forth such of the following information as may be applicable:
32 P.S. § 636