Iowa Code § 28J.11: Provisions do not affect other laws or powers.

This chapter shall not do any of the following:

1. Impair a provision of law directing the payment of revenues derived from public property into sinking funds or dedicating those revenues to specific purposes.

2. Impair the powers of a political subdivision to develop or improve a port and terminal facility except as restricted by section 28J.15.

3. Enlarge, alter, diminish, or affect in any way, a lease or conveyance made, or action taken prior to the creation of a port authority under section 28J.2 by a city or a county.

4. Impair or interfere with the exercise of a permit for the removal of sand or gravel, or other similar permits issued by a governmental agency.

5. Impair or contravene applicable federal regulations.