(a) In this section, "sole expense" means the actual cost of lowering, rerouting, changing the grade of, or altering the construction of a facility described by Subsection (b) in providing comparable replacement without enhancement of the facility, after deducting from that cost the net salvage value of 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 the relocating, raising, rerouting, changing the grade, or altering of the construction of a highway, railroad, electric transmission line, telegraph or telephone property or facility, or pipeline, the necessary action shall be accomplished at the sole expense of the district.