California has a rapidly expanding population, one of the world's most important agricultural zones and a chronic lack of water. That contradiction has led to 70 years of wrangling punctuated by outbursts of violence and corruption.

A new plan is being drawn up which is intended to resolve the outstanding problems once and for all, finding a balance between the needs of farmers, consumers and the environment.

Travelling from one of the primary sources of the state's water in the far north to the threatened landscape of the Sacramento-San Joaquin Delta Tom Heap hears the voices of those who've spent their lives in these stunning landscapes, feeling themselves at the mercy of those in power.