Waterways of south-western Western Australia

Major Waterway	Tributaries	Area (km2)	Catchment Area (km2)	Average Rainfall in Catchment (mm)	Nutrient Status	Major Problems	Major Catchment Land Uses
Swan-Canning Estuarine System	Swan Avon Canning Southern Helena Ellen Brook Jane Brook	53.0	Swan Coastal Plain: 1,516 Hills and Avon River Basin: 119 379	869	Moderate	Upper reaches: pressure from development; and eutrophication occuring, leading to algal blooms and fish deaths Aquatic weed infestations	Urban areas: residential, commercial and industrial Upper reaches: horticulture, including vineyards and market gardens
Avon River	Dale Mortlock		Avon River Basin: 119 3792	Darling Scarp: 1,200 Inland catchment: 400	Moderate	Loss of permanent river pools through siltation Loss of riverine habitat by clearing for agriculture Increased salinity and occasional algal blooms	Mainly dryland agriculture (wheat-sheep) western areas: sheep central areas: mixed eastern areas: wheat
Peel-Harvey Estuarine System	Serpentine Murray Harvey	136.2	12,000	885	Severely nutrient-enriched	Eutrophication resulting in excessive macroalgal growth and microscopic algal blooms, leading to fouling of beaches and fish deaths Development pressure around the estuary resulting in habitat loss	Urban areas: includes residential and commercial around the estuary Darling Scarp: forested, with mining Coastal plain: agriculture, including beef farming and intensive animal industries (piggeries)
Leschenault Estuary and Inlet	Collie Brunswick Wellesley	25.4	4,933	871	Moderate	Unknown	Upper catchment: largely forested Water resources
Vasse-Wonnerup Inlet	Vasse	Unknown	Unknown	Unknown	Severely nutrient-enriched	Loss of fringing vegetation Sedimentation Nutrient enrichment Pesticides pollution	Unknown
Hardy Inlet	Blackwood Scott	11.8	23,000	992	Moderate	Increased saline drainage from cleared catchment	Unknown
Donnelly River	Barlee Brook	60 km long	1,591	Unknown	Nutrient poor	Unknown	Largely forested
Warren River	Tone Perup	150 km long	4,093	Unknown	Nutrient poor	Unknown	Largely forested
Gardner River	Canterbury	35 km long	539	Unknown	Nutrient poor	Unknown	Largely forested
Broke Inlet	Shannon Forth Inlet	48	928	Unknown	Nutrient poor	Unknown	Largely forested
Walpole-Nornalup Inlet	Deep Frankland Walpole Collier Creek	13.2	7,398	1,400	Walpole: moderate Nornalup: nutrient poor	Walpole: nutrient enrichment; recreational pressures	Forested Agriculture: grazing and cereal production
Irwin Inlet	Kent Bow	10.0	2,270	Unknown	Moderate	Estuary bar management Salinity	Upper catchment: agriculture (sheep and cereals) Middle catchment: largely forested Lower catchment: grazing (beef); potato, fruit and vegetable growing
Parry Inlet	Kordabup	1.4	119	980	Moderate	Estuary bar management Salinity	As above
Wilson Inlet	Denmark Hay Sleeman	48.0	2,379	1,100	Moderate	Estuary bar management Salinity	As above
Torbay	Marbellup Br Torbay Main Drain	1.0	399	880	Severely nutrient-enriched	Drainage management Blue-green algal blooms	Upper catchment: grazing and cereals Lower catchment: grazing and potato growing
Oyster Harbour	Kalgan King	15.6	3,041	860	Severely nutrient-enriched	Eutrophication resulting in excessive macroalgal growth and seagrass decline	Agriculture
Princess Royal Harbour		28	83.5	900	Severely nutrient-enriched	Eutrophication resulting in excessive macroalgal growth and seagrass decline	Urban areas Industry Agriculture
Taylors Inlet		<1.0	10	800	Moderate	Blue-green algal blooms	Unknown
Normans Inlet		<0.5	18	850	Unknown	Marginally fresh water	Unknown
Waychinicup Inlet		145	145	760	Unknown	Marginally fresh water	Unknown
Cheyne Inlet	Eyre	Unknown	77	610	Moderate	Saltmarsh on northern side	Unknown
Beaufort Inlet	Pallinup	4.5	104	390	Severely nutrient-enriched	Saline 84% cleared	Unknown
Wellstead	Bremer	2.5	716	510	Unknown	Saline 80% cleared	Unknown
Gordon	Gairdner	Unknown	1,770	405	Unknown	Saline 60% cleared	Unknown
St Marys		Unknown	169	490	Unknown	Marginally fresh water	Unknown
Fitzgerald	Fitzgerald	7	1,611	410	Unknown	Brackish 40% cleared	Unknown
Dempster		2.3	335	460	Unknown	Marginally fresh water	Unknown
Hamersley	Hamersley	2.3	838	440	Unknown	Brackish	Unknown
Culham	West Phillips	2,307	425	Unknown	Unknown	Saline 50% cleared	Unknown
Jerdacuttup		Unknown	1,818	430	Unknown	Saline 40% cleared	Unknown
Oldfield Estuary	Oldfield	3 km long	2,479	541	Unknown	Apparently, good condition	Recent agricultural development
Torradup River Estuary	Torradup	3.5 km long	87	541	Unknown	Unknown	Recent agricultural development
Stokes Inlet	Young Lort	14	4,575	541	Unknown	Sedimentation	Recent agricultural development
Barker Inlet		1.8	259	541	Unknown	Unknown	Recent agricultural development