(a) The district shall operate and maintain any levee, retainage pond, pump, mitigation channel, or other facility, improvement, or property that serves property in the district unless the Harris County Flood Control District undertakes to operate or maintain the facility, improvement, or property.(b) If, at the time the district is annexed by a municipality, the annexing municipality determines not to undertake to operate or maintain a levee, retainage pond, pump, mitigation channel, or other facility, improvement, or property that serves property in the district, the municipality may specify in the annexation ordinance that the district shall continue to exist exclusively to:(1) operate and maintain the levee, retainage pond, pump, mitigation channel, or other facility, improvement, or property; and(2) impose a maintenance tax in the boundaries of the district, to the extent that a maintenance tax has previously been authorized. Added by Acts 2013, 83rd Leg., R.S., Ch. 112 (S.B. 1026), Sec. 1.03, eff. April 1, 2015.