 Apart from supplying water to eastern Adelaide, it also serves a flood protection role and holds 19,160 megalitres.Castambul is located east of Montacute on the road out of Adelaide via Athelstone (Gorge Road).Castambul has a CSR calcite quarry and tea gardens, both located on Gorge Road, and the former Victoria Goldmine on Batchelor Road is a heritage-listed site.