Concerns that new Nevada Governor Brian Sandoval's reorganization of the State's Agricultural Department is motivated by ag board opposition to the proposed water pipeline seem not too far-fetched. (More from the Great Basin Water Network.)
Patricia Mulroy, Water Empress, the Southern Nevada Water Authority's chief executive, and very very pro-pipe and pro-pipe growth, is on the Gov's transition team.
Ag board members and others probably oppose it because without water there is no agriculture, or much life at all in the Great Basin for that matter. But I'm just guessing here.