Waterway facts

Catchment	Princess Royal Harbour	Oyster Harbour
Total area (ha)	8,351	304,092
Subcatchments	Nil	King, Mill Brook, Upper Kalgan, Lower Kalgan, North Oyster, Chelgiup, Willyung, Johnston Creek, Yakamia Creek, Town of Albany
Annual average rainfall	937 mm	937 mm (coastal) 500 mm (inland)
Catchment area cleared (ha)	2,952 (35% of total)	219,077 (72% of total)
Dominant land uses	National Park Rural: beef farming; potato growing Residential Groundwater protection	Rural: sheep and cattle grazing Residential near Albany Viticulture
Waterway	Princess Royal Harbour	Oyster Harbour
Waterway type	Marine embayment	Estuary
Total area (km2)	29	16
Perimeter (km)	26	18
Length (km)	8	5
Width (km)	4	3
Depth	Max: 10 m in dredged channel Half total area less than 2 m	Max: 12.5 m scoured entrance channel Half total area less than 1m
Estimated flushing rate	20 days	Surface waters: 2 days Bottom waters: 10-20 days
Average salinity	35 ppm. Slightly higher in summer. Generally well-mixed	35 ppm. Higher, and vertically stratified, in summer
Discharging rivers and creeks	Limeburners Creek Numerous agricultural drains	King River Kalgan River Yakamia Creek Johnston Creek
Catchment	Kalgan River	King River
Length (km)	110	27
Tidal distance	9	7
Annual average run off	45 million m3	12 million m3
Salinity at discharge	3,700 mg/L mean	800 mg/L