Monday, 3 August 2015

Waterway report

Christchurch Waterways 
In Christchurch we have manmade and natural waterways. When it rains water flows from concrete and roofs into drains and out into natural rivers. Rain that falls on grass or trees will go into aquifers and then humans pump it up. And water will come out of the tap. I think we should look after our waterways because if one gets contaminated others get contaminated because they all connect.

Habitat
A habitat is a place where animals like eels can live. The eel is connected to the freshwater crayfish because the eel eats the crayfish. If the crayfish died the eel would die because it would have nothing to eat. Eels and the ducks are connected because they both need shade they get there shade from nearby plants such as flax and bushes. If there were no plants you may not find ducks or eels.    

Healthy waterways 
An unhealthy waterway will look like this: you will see snails, worms and no other macroinvertebrates. If it is healthy the waterway will contain mayfly, stonefly, caddisfly.
If the water way was unhealthy the water would be over 20 degrees celsius. If it was healthy it would be 15 degrees celsius or less.

Method
We have visited all sorts of rivers and tested them. These are the rivers we visited: Styx river, Dudley creek, Styx Mill lake and the Waimairi stormwater drain. We tested them all. We used the “In-stream and riparian habitat survey” to decide how healthy the water was. We also fished out invertebrates with a sieve on a stick. We studied them to find out what they were and counted them, using the Invertebrate survey.
We also looked through a plastic tube to measure the amount of turbidity.

River findings
Dudley creek is not as healthy as could be. There are only a few bushes holding up the bank this means that dirt will erode into the river because their roots hold it up which means that the river will not be healthy. 
There is not much shade over the stream which means that no invertebrates can live there.
There is not much difference in the stream flow. This is bad because some animals like different habitats because not all animals like fast waterways.

Suggested changes
I think that we could improve on the storm water drain by planting some plants on the bank to create a nice habitat for all animal life and create shade for macroinvertebrates and other animals. 
We could also put some logs in the habitat to create a new fast flowing and slow flowing habitats because some animals like fast or slow flowing areas.
Why are these changes important?
because otherwise we would not have nice rivers to swim in.
Kaitiakitanga means protection and guardianship, and this means it is a cultural value to waterways. We need to look after our waterways so that everyone can enjoy them in the future.

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