Question: What indigenous Australian people warned settlers that the Hoffnungsthal, South Australia was prone to flooding?

Context paragraphs:
Adnyamathanha: The Adnyamathanha (Pronounced: ) are an Indigenous Australian people from the Flinders Ranges, South Australia.  Adnyamathanha is also often used as the name of their traditional language, although the language is more commonly called 'yura ngarwala' by Adnyamathanha people themselves (being Adnyamathanha for - loosely translated - 'our speech').

Maralinga Tjarutja: The Maralinga Tjarutja is the corporation representing the traditional Anangu owners of the remote western areas of South Australia known as the Maralinga Tjarutja lands.  It is one of the four regions local government areas of South Australia classified an "Aboriginal Council" (AC) and not incorporated within a local government area.  This indigenous Australian people whose historic rights over the area have been officially recognized belong to the southern branch of the Pitjantjatjara people.  They have a community centre at Oak Valley, 520 miles NW of Ceduna, and close historicasl and kinship links with the Yalata 350km south, and the Pila Nguru centre of Tjuntjuntjara 370km to their west.

Ngintait: The Ngintait or Ngindadj were an Indigenous Australian people of the northwest corner of the state of Victoria, and partly in South Australia.  9 people, all of one family, claim descent from the tribe, which was dispersed in the 19th century.

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.

Survival Island 3: Survival Island 3: Australia Story was an iOS and Android game created by Kristina Fedenkova of NIL Entertainment, notorious for its blatant violence and racism against Australian Aboriginals.  The game was released onto the App Store and Google Play in December 2015.  The game is a 3D first-person survival-action game in which the player is able to ally with or fight against Indigenous Australian people as well as a variety of Australian fauna while trying to survive.  It attracted strong criticism in Australia for its allegedly racist presentation of Indigenous Australians, which were presented as "real Aboriginals" and a threat to the fair-skinned player's survival.  The game was also criticised for allegedly encouraging the player to perpetrate violence against Indigenous Australians.  Apple rated the game PG for ages 12 and up.

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.

Spinifex people: The Pila Nguru, often referred to in English as the 'Spinifex people', are an Indigenous Australian people of Western Australia, whose lands extend to the border with South Australia and to the north of the Nullarbor Plain.  The centre of their homeland is in the Great Victoria Desert, at Tjuntjunjarra, some 700 kilometres east of Kalgoorlie, perhaps the remotest community in Australia.  The Pila Nguru were the last Australian tribe to have dropped the complete trappings of their traditional aboriginal lifestyle.

Ayabakan: The Ajabakan were an Australian indigenous people of Australia indigenous Australian people of the Cape York Peninsula of Queensland

Tanganekald people: The Tanganekald were an indigenous Australian people of South Australia.

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.

Supporting paragraphs: Hoffnungsthal, South Australia Peramangk
Answer: Peramangk