Monday, 20 July 2015

Water way report

Christchurch Waterways

Groundwater originated from the alps and it was formed by rain hail sleet snow then it Goes to our aquifers underground.  Springs are formed by water pressure under the ground which is caused by blockage caused by mud silt and dirt  which forces the water up and which causes a spring.  Water creates streams which goes to rivers.

When it rains stormwater goes into our gutters which leads to our stormwater drains, which then goes to our rivers.

River ecosystems

There's a connection with each creature and its food chain and its habitat one connection is the mayfly larva and water temperature. The Mayfly relies on temperature because if the water was too hot there would not be enough oxygen in the water. That's why it's good to have tree shade over rivers or waterways. The mayfly larva is a macroinvertebrate. Most macroinvertebrates like the water below 15 degrees celsius.

The mayfly larva eats submerged vegetation. There is also a connection between the paradise duck and vegetation. Vegetation is a very important part of a water ecosystem because lots of creatures live off vegetation.  The paradise duck is connected because  it not only eats it it uses it for shelter too.

River Health Indicators

A good way to test a waterways health is to see what creatures are in it. If there are macroinvertebrates in it like May fly larva, stone fly or even damselflies the health would be a good.  The way you use macroinvertebrates to test water is they are fussy about their water conditions and by testing water temperature. Most macroinvertebrate love their water 15 degrees or under.  

Method and Results

We did a survey which gave us options to score to assess  the river's health. The things we scored on were shade, water turbidity and algae. Then we totaled the score.  For Styx River, the shade was scored 6  becausen half the river was covered, which was good because it would keep the then temperature down, which Is good for macroinvertebrates.

Next I scored on the stream flow.  I gave the score a 4 because it didn't have much movement just a straight stream flow. Next we scored on erosion I gave the score a 6 because there were some signs of erosion but it wasn't too bad. Next we scored on silt and sediment I gave it a 4  because it had lots of sediment and  silt covering the river bed, because when the water moves it all flowed through the river.

Next we scored on how much vegetation was there was good fair amount so I gave it a 3-9 meters of vegetation, which was good sign. Next we scored on algae. There was a medium film of algae which I gave the score a 6. What types of plants are around the river edge? There were lots willows, ferns  and lots of tussocks.  I would give the score a 8 .

Suggested Changes

  • To fix the straight water flow maybe they could add rocks to create riffles in the water to get a good fast waved water flow

  • For the sediment problem they should add some shingle and stones to make a better habitat for macroinvertebrates   

  • For erosion they should plant more plants  to make a sturdier bank  

  • To get more vegetation  in your water way plant more plants such as cabbage  trees and toe toe  

  • And plant native trees to get more shade for the river


1 comment:

  1. What an excellent report Caitlyn. You have worked very hard on this and you clearly have learnt a lot about how to care for waterway ecosystems. I now love the idea of planting native trees and grasses near waterways. Thank you.