The Department of Water Resources is working on a bold plan to bring water to Northern California.

And that plan involves sending water back up the California aqueduct.

Engineers say diesel pumps would be used to reverse the flow in a complex system, requiring millions of dollars to defy gravity.

However, at least five local water districts have drawn up the details and are hoping for approval in June. 

The costs for the plan would be between $1.5 million to $9.5 million and would affect anywhere from 33 to more than 100 miles of the water system. 

The costs for the plan would be covered by the local water districts.