Beneath our feet flows Anns Creek. It is a small stream with a big story. Anns Creek is a waterway that has seen significant change. It is located in central Auckland.
Anns Creek is not just any stream. It is a first order stream. This means it is at the very beginning of a river system. Rainwater gathers. It forms tiny rivulets that become Anns Creek.
The creek flows through a low gradient gully. This gentle slope shapes its course. The water moves slowly towards its destination. Anns Creek flows in a southwesterly direction. It eventually drains into Māngere Inlet. This inlet is part of the larger Manukau Harbour.
The surrounding area is heavily modified. Much of the land is used for industrial purposes. This has impacted Anns Creek. The catchment area is largely industrial.
Let’s step back in time. Imagine Auckland before industrialization. The creek would have been surrounded by native bush. Birds would have sung in the trees. The water would have been clean and clear.
But times have changed. The needs of the city grew. Industry moved in. Anns Creek became a drain for the surrounding area.
Despite these changes, Anns Creek is still monitored. Scientists track its health. They measure things like macrofauna. They also measure sediment and metal content. These tests help us understand the creek’s condition.
Monitoring began in 1998. Since then, it has occurred every few years. Scientists look at copper, lead, and zinc levels. They also check for arsenic and mercury.
The macrofauna score tells us how impacted the site is. It is impacted by mud. Low scores mean good health. High scores mean poor health.
Mud content is also measured. It refers to fine silt and clay particles. These particles can affect the macrofaunal community. National guidelines help assess the mud content.
The contaminant concentration is checked too. It is measured in the sediments. The annual values are assessed against guidelines. These guidelines show the likelihood of negative ecological impacts.
We must consider its future as we stand here. Anns Creek faces many challenges. But with careful monitoring and management, its health can improve.
Anns Creek flows towards the Māngere Inlet. It reminds us of the connection between nature and industry. It shows the impact of our choices. It highlights the importance of conservation.