Tex. Spec. Dist. Local Laws Code § 1122.110

In exercising the power of eminent domain, if the board requires relocating, raising, lowering, rerouting, changing the grade, or altering the construction of any railroad, highway, pipeline, or electric transmission and electric distribution, telegraph, or telephone line, conduit, pole, or facility, the district shall pay the actual cost of that activity to provide a comparable replacement, without enhancement of facilities, after deducting the net salvage value derived from the old facility.