Question: Who are an indigenous Australian people whose traditional lands are primarily located in the Adelaide Hills, that warned the settlers that the area was prone to flooding, but this advice was ignored?

Context paragraphs:
Hoffnungsthal, South Australia: Hoffnungsthal ("Valley of Hope") is the location of a former German pioneer settlement, located in South Australia's Barossa Valley.  Founded in 1847, it was located in an ephemeral lagoon which was dry for the first years of settlement.  Local Peramangk people warned the settlers that the area was prone to flooding, but this advice was ignored.  In October 1853, after a week of heavy spring rains, the village was flooded and many of the houses were evacuated.  After the cost of a proposed drain was seen as prohibitive, the village was eventually left deserted.  Most of the settlers moved to the Barossa village of Bethanien as well as further a field.

Mati Ke: The Mati Ke are an indigenous Australian people, whose traditional lands are located in the Wadeye area in the Northern Territory, Their language is in danger of extinction.

Ngadjuri: The Ngadjuri people are a group of Indigenous Australian people whose traditional lands lie in the mid north of South Australia with a territory extending from Gawler in the south to Orroroo in the north.

Jarijari: Jarijari were an indigenous Australian people whose traditional territory was located in the Mallee region of Victoria.

Marrithiyal people: The Marrithiyal are an indigenous Australian people whose traditional territory lay 30 to 50 miles south of the Daly River in the Northern Territory.  They were sometimes known derogatively as "Berringen"(Berinken/Brinken), a term used by the Mulluk-Mulluk to refer to 'aliens'/strangers'.

Djindubari: The Djindubari, almost written "Jindoobarrie" or "Joondubarri," were an indigenous Australian people of southern Queensland, whose traditional lands were located on Bribie Island.

Garrwa people: The Garrwa people, also known as Garawa, are an Indigenous Australian people living in the Northern Territory whose traditional lands extended from east of the McArthur River at Borroloola to Doomadgee and the Nicholson River in Queensland.

Gulidjan: The Gulidjan, also known as the Kolakngat, perhaps originally "Kolidjon", or "Colac tribe" are an indigenous Australian tribe whose traditional lands cover the Lake Colac region of Victoria, Australia.  They occupied the grasslands, woodlands, volcanic plains and lakes region east of Lake Corangamite, west of the Barwon River and north of the Otway Ranges.  Their territory bordered the Wathaurong to the north, Djargurd Wurrung to the west, Girai Wurrung to the south-west, and Gadubanud to the south-east.

Narungga: The Narungga are a group of Indigenous Australians whose traditional lands are located on Yorke Peninsula, South Australia.  The boundary of their traditional lands runs roughly between the towns of Port Broughton and Port Wakefield.

Peramangk: The Peramangk are an indigenous Australian people whose traditional lands are primarily located in the Adelaide Hills, and also in the southern stretches of the Fleurieu Peninsula in the Australian state of South Australia.  They were also referred to as the Mount Barker tribe, as their numbers were noted to be greater around the Mount Barker summit, but Peramangk country extends from the Barossa Valley in the north, south to Myponga, east to Mannum and west to the Mount Lofty Ranges.

Supporting paragraphs: Hoffnungsthal, South Australia Peramangk
Answer: The Peramangk