Ariz. Rev. Stat. § 48-3603
C. A district organized under this article, acting through its board of directors, may:
20. Either alone, or by entering into any combination of contracts with this state, the United States, any other flood control district, a floodplain board, a municipality or other political subdivision, a government agency, an irrigation or agricultural improvement district or an association, corporation or individual, implement flood control enhancement solutions including:
J. The district and its employees and officers are not liable for any injury or property damage that may arise out of a plan or design for construction, maintenance or improvement to a dam, levee, berm, channel, canal or culvert or any other flood control project the district is authorized to plan, design, construct, maintain or improve when a reasonably adequate warning of any unreasonably dangerous hazard is given to potentially affected property owners in a manner that owners may take suitable precautions to protect themselves and their property. The warning shall include information for the property owner regarding a national flood insurance program. A warning is sufficient pursuant to this subsection if the warning is provided to a single property owner of the parcel, and notice to subsequent property owners is not required. The immunities prescribed by this subsection are in addition to and not in derogation or limitation of the immunities granted a district, employee or officer as otherwise provided by law and apply if either or both of the following conditions are met:
K. Section 9-402 does not apply to the grant of an easement on or a lease of district real property to any party other than this state or a political subdivision of this state as prescribed by this subsection. A district may authorize the grant of an easement on or a lease of district real property without public auction under the following conditions: