Iowa Code § 468.116: Failure to comply.

If the owner or operator of the utility fails to afford such passage within fifteen days after written notice from the drainage engineer so to do, the contractor, under the supervision of the engineer, may proceed to do the necessary work to afford such passage and to place said utility in the same condition as before said passage; but the owner or operator shall have the right to designate the hours of the day when such crossing or passage shall be made.