Bali: The only source of irrigation water here in the Valley is Colorado River water. And we use about 20% of the annual yield of the river. On average, we have about 15 million acres feet of water and we use here down in the Valley, there million acre feet.
Narrator: About one-third of applied irrigation water leaves fields as surface runoff that eventually flows into the Salton Sea – the largest inland body of water in California. This runoff threatens fish and wildlife, so Bali has developed improved irrigation practices.
Bali: The way we're doing it is by minimizing the amount of surface runoff at the same time we reduce the subsurface drainage.
Narrator: For Science Today, I'm Larissa Branin.