(a) In this section, "sole expense" means the actual cost of relocating, raising, lowering, rerouting, changing the grade of, or altering the construction of a facility described by Subsection (b) in providing comparable replacement without enhancing the facility, after deducting from that cost the net salvage value derived from the old facility.
(b) If the district's exercise of the power of eminent domain, the power of relocation, or any other power granted by this chapter makes necessary relocating, raising, rerouting, changing the grade of, or altering the construction of a highway, railroad, electric transmission line, telephone or telegraph property or facility, or pipeline, the necessary action shall be accomplished at the district's sole expense.