In 2009, Kevan Davis, a Ballardong Elder from Wyalkatchem, oversaw the cleaning of Derdibin gnamma (Noongar word for rockhole). Kevan provided cultural advice and ensured the work was completed in the right way. The cleanout was conducted by Aboriginal students from C Y O’Connor Institute of TAFE, local farmers, WWF and Wheatbelt NRM. Professor Brian Timms, a gnamma expert, surveyed the aquatic fauna at Derdibin three times in the year following the clean-up. He found that species diversity increased with each visit, and all species were common and indicative of a healthy Wheatbelt gnamma. Derdibin gnamma is located on a public reserve only accessible via private property. Thanks to the surrounding landholder, Kevan has access to the reserve into the future.
Gnammas are an important feature of the Australian environment, and they are prominent in the Nyitting (Noongar word for dreaming) for Aboriginal people throughout Australia. Traditionally, Aboriginal people managed gnammas throughout the Wheatbelt to ensure the health of the country and wildlife, and that the people had access to clean drinking water.