The Swan River drains the Avon and coastal plain catchments, which have a total area of about 121,000 km2. It has three major tributaries, the Avon River, Canning River and Helena River. The latter two have dams (Canning Dam and Mundaring Weir) which provide a sizeable part of the potable water requirements for Perth and the regions surrounding. The Avon River contributes the majority of the freshwater flow. The climate of the catchment is Mediterranean, with mild wet winters, hot dry summers, and the associated highly seasonal rainfall and flow regime.
This post is part of the Water World Wednesday meme,
and also part of the Outdoor Wednesday meme.