No eminent domain over Delta water rights for export

No public agency may utilize eminent domain proceedings to acquire water rights, which are held for uses within the Sacramento-San Joaquin Delta as defined in Section 12220 of the Water Code, or any contract rights for water or water quality maintenance in the Delta for the purpose of exporting such water from the Delta. This provision shall not be construed to prohibit the utilization of eminent domain proceedings for the purpose of acquiring land or any other rights necessary for the construction of water facilities, including, but not limited to, facilities authorized in Chapter 8 (commencing with Section 12930) of Part 6 of Division 6 of the Water Code.