DISTRICTS ‑- DRAINAGE ‑- MAINTENANCE OF SYSTEM OF DITCHES TO CARRY OFF SURFACE WATERS ‑- CONTRACT BETWEEN DISTRICT AND INCORPORATED TOWN A drainage district organized under chapter 85.06 RCW and an incorporated town are authorized to enter into a contract whereby the town will provide financial assistance to the district for maintenance of the district's system of ditches used in part as a carrier of surface waters originating within the territorial limits of the town provided the services to be rendered to the town are within the contemplation of RCW 35.27.370.