California is thirsty. From the sprawl of Los Angeles to the comparatively small agricultural villages that dot the Golden State’s Central Valley, most of the 37.5 million people that populate the state rely on the rivers that flow from the Sierra Nevada down the western slope toward the Pacific Ocean. Locally, the Nevada Irrigation District supplies more than 25,000 residences, businesses and farms with water collected from mountain snow pack and stored in a network of 10 reservoirs. Officials at the public agency are particularly keen on monitoring the annual construction of snow pack as it directly impacts its ability …