Any resolution authorizing, or other instrument appertaining to, any securities under the Eastern Sandoval County Arroyo Flood Control Act may provide that each security authorized by such a resolution shall recite that it is issued under authority of that act. Such recital shall conclusively impart full compliance with all of the provisions of the Eastern Sandoval County Arroyo Flood Control Act, and all securities issued containing such recital shall be incontestable for any cause whatsoever after their delivery for value.