Question: Brown Hill Creek is part of what river that drains an area of swampy lands formerly known as the Cowandilla Plains?
Sentence (from "Patawalonga River"): It drains an area of flat, swampy lands formerly known as the Cowandilla Plains, which in the mid-20th century were drained by engineering works, enabling the establishment of Adelaide Airport and the development of residential housing.
Relevant evidence: Yes