California Code, Water Code - WAT § 24955

The estimate may include a sum sufficient to pay the interest on the proposed construction bonds for four years or less and, if the bonds are to be payable solely from revenues, the estimate may also include a sum for a revenue bond reserve fund to be set aside out of the proceeds of sale of revenue bonds to be maintained by revenues and used and withdrawn solely for the purpose of paying the principal of and interest on such bonds in the event that no other funds are available therefor.