A battle remains underway in the Sacramento-San Joaquin Valley Delta. For decades, Delta residents and the state have been unable to agree on a plan to transport water from the rainy but rural northern part of the state down to the heavily populated, dry southern half. The current Delta Conveyance Project wants to put a tunnel underneath the Delta to transport water. Former Governor Jerry Brown proposed two tunnels and Gov. Gavin Newsom narrowed it down to one. To understand its significance and the controversy surrounding it, you need to look at the Delta.