An organized drainage district is a political subdivision of the county in which it is located, its purpose being to aid in the governmental functions of the county. It is a legally identifiable political instrumentality created by state statute. A drainage district is a legislative creation which has no rights or powers other than those found in statutes which give and sustain its life. It is a standalone organization that exists solely for the purpose to locate and establish drainage and levees, and cause to be constructed any levee, ditch, drain, or water course whenever the same will be of public utility or conducive to the public health, convenience or welfare. When any levee or drainage district has been established and the improvement constructed, the trustees are mandated by Iowa law to keep the improvement in repair.