(a) A watermaster shall divide the water of the streams or other sources of supply of his division in accordance with the adjudicated water rights.
(b) A watermaster shall regulate or cause to be regulated the controlling works of reservoirs and diversion works in time of water shortage, as is necessary because of the rights existing in the streams of his division, or as is necessary to prevent the waste of water or its diversion, taking, storage, or use in excess of the quantities to which the holders of water rights are lawfully entitled.

(c) A watermaster may regulate the distribution of water from any system of works that serves users whose rights have been separately determined.
(d) A watermaster’s duties shall not include activities which relate to other programs of the commission, except in situations of imminent threat to public health and safety or the environment.