It shall be the general rule that an application must be filed for each separate source of water. In special instances one application may cover more than one source of water such as, a group of springs in close relationship to each other and with no intervening property ownership; and, to divert from two or more streams whose confluence is upon lands of the applicant; and, where a common distribution system may be employed. The amount, point of diversion, and purpose of use from each source must be indicated in the application.