Another review up for The Last Stormlord, from Katherine Keller
You can read it here, at Sequential Tart.
Here's the final paragraph:
For all that it's all about water and the control of water in an arid land, The Last Stormlord is no thinly veiled homage to Dune. It's a unique and multi-layered story that melds plot, politics, and some pretty intense action into a seamless whole. And, as a person who grew up in eastern California and knows well the history of the (vicious and brutal) fight for control of water there, I loved every page of this story.
Water, and control of water is power indeed.