The board of county commissioners may make such changes in the boundaries of the proposed district as may be necessary by including therein upon the application of the owners thereof of other lands susceptible of drainage by the proposed system, or which will be benefited by the system of drainage, and by excluding therefrom lands mentioned in the petition which in the opinion of the board of county commissioners will not be susceptible of drainage thereby or will not be benefited by the system of drainage, but the board of county commissioners shall not exclude from said district any lands described in the petition which, in the opinion of the board, are susceptible of drainage by the system or will be benefited thereby.
C.R.S. § 37-20-108