CA Water Code Section 484

(a)

The temporary transfer of any water or water right that otherwise would have been consumptively used or stored by the transferor in the absence of the temporary transfer, does not in any way prejudice the transferor’s right to the use of the water in the future.

(b)

“Consumptively used,” for purposes of this section, means the amount of water which has been consumed through use by evapotranspiration, has percolated underground, or has been otherwise removed from use in the downstream water supply as a result of direct diversion.