(a) If a district in the exercise of the powers conferred by this subchapter or in the exercise of the power of eminent domain or the police power requires the relocating, raising, lowering, rerouting, or changing in grade, or altering in the construction of any railroad, electric transmission line, telegraph or telephone line, conduit, pole, properties or facilities, or pipeline, the relocating, raising, lowering, rerouting, changing in grade, or altering of construction shall be done at the sole expense of the district.
(b) "Sole expense" means the actual cost of the relocation, raising, lowering, rerouting, change in grade, or alteration of construction in providing comparable replacement without enhancement of the facilities, after deducting the net salvage value derived from the old facility.