Whenever suit is brought for general adjudication or to determine conflicting water rights in any of the courts of this state, a copy of the complaint shall be by the complainant mailed by registered or certified letter to the Water Management Board at its office at the state capital, at the time of the first service of summons in the action, and likewise a copy of any amended complaint or cross-complaint shall be mailed in like manner to the board immediately after service thereof upon the opposing party.
SDCL 46-10-5