Picnickers and passers-by often leave their litter behind or, worse, throw it inside the bird sanctuary.
Much litter also washes into the Sanctuary from surrounding roads via stormwater drains.
Two pumping stations pump the sewerage which drains from the entire suburb, to the treatment plant a few kilometres away.
Spills into the pan occur due to pump failures, pipe blockages and cracked pipes.
Cats enter the Sanctuary to catch birds and frogs.
Escaped exotic water fowl sometimes appear such as domestic geese, or black swans which have naturalised in the Sanctuary.
Alien and Invasive Plants
Invasive vegetation is our biggest environmental threat.
Some troublesome Category 1b plants found in Korsman include:
- Black Locust - Spear Thistle
- Bugweed - Pom Pom Weed - Purple Top - Jerusalem Cherry
Water Level Control
As the pan has no natural outlet, it can overflow in times of high rainfall. This reduces biodiversity by flooding the grassland, eliminating habitat for waders and encouraging overgrowth of reeds.
Runoff is higher in recent years due to the higher housing density and large paved areas in complexes.
An evacuation pump in the Westdene North pump station transports the water via the Benoni Lake golf course into Middle Lake.
Owls which eat poisoned rats and vermin are killed in turn by the ingested poison. The best way to prevent vermin is keeping the property clean. All rat poisons are dangerous, with Racumin the least toxic.
Air and Noise Pollution
Air pollution comes from nearby industries and illegal rubbish burning.
Noise pollution is caused by industries, firework displays and loud events.
Vehicles on The Drive kill birds, frogs and crabs, and threaten pedestrians and cyclists.