Thursday, 2 July 2015

healthy waterways report Chris


Waterways in Christchurch are all connected.    Springs connect  to the aquifers and connect to the river because they both have stones dirt and the aquifers create springs and the springs create wetlands and rivers.  

The wetlands are connected to the springs because the springs make the wetlands and the springs are made when the aquifers water builds up blasts through the ground. And the springs flow to the wetlands and and sometimes create the wetlands.   

Wells and aquifers connect because the wells were dug into the aquifers. Because the aquifers has nice clean water to drink.

The groundwater and rain connect because the rain soaks through the ground into the aquifers.  Surface water and stormwater connects because the surface water goes into the stormwater drains.  The stormwater then goes straight into our rivers.  

Different types of species live in different habitats and eat different foods. The pukeko eats the vegetation. If there was no vegetation there would be no pukeko. Also the mud fish likes to lives under logs.  By protecting the mudfish’s habitat we also protect different species like the dragonfly, freshwater mussels and freshwater crayfish.

Also mayfly larvae needs the vegetation to  grow and stay alive.  It needs submerged plants as well so when the Mayfly larvae is ready to fly it can climb out on to the land. Also the mayfly is connected to the freshwater crayfish because the crayfish eats up the sediment and the Mayfly larvae does not like the sediment. Also the Mayfly larvae relies on the water temperature because when the water is too hot the mayfly larvae finds it hard to breath and dies because the there is not much oxygen. Cold water has lots oxygen. Also the Mayfly larvae needs a stony habitat to help him hide from fish.

The freshwater crayfish connects to the blue duck because the freshwater crayfish is a food source for the blue duck. If there was no freshwater crayfish there would be less blue ducks. The eel counts on the freshwater crayfish because it is a food source for the eel  so if there was no fresh water crayfish there would be fewer eels.

Healthy waterway and unhealthy waterways
There are lots of different indicators of an healthy waterways and a unhealthy one.  In a healthy river you would see lots of macroinvertebrates such as backswimmers, water boatmen, mayfly larvae and the dobsonfly, and the water temperature would be under 15 degrees.

The most macroinvertebrates find it hard to breath in warmer water and they die. A healthy stream would also have thin layer of algae so the macroinvertebrates can eat it.  A healthy river would not have erosion. The river would have lots of trees and plants around it. It would not have lots of turbidity because the mayfly larvae and most of the macroinvertebrates don't like the turbidity. The mayfly larvae is a very very good sign of a healthy river.

Unhealthy river
There are lot's of indicators to know of the river unhealthy or not in a unhealthy river you would only find snails and worms in the river. The water temperature would be 20 degrees or above and most macroinvertebrates would find it hard to breath and would die. The river would a thick layer of algae. The river would be eroded and the turbidity would be high. Most macroinvertebrates don't like it if there is too much sediment, and it clogs the gills of fish.

Testing our waterways
We visited and assessed different  waterways ecosystems  around Christchurch. There are many methods of testing waterway ecosystems.  We used an invertebrate survey using this to assess the Macroinvertebrates in the river .  We also had an in stream and riparian habitat survey. This is how to use it  you rate different things about the stream out of eight and then you add up the score at the end.  We also used trd also know as a Sieve o a stick and we also had mrd also know as a spoon and that's what we used when we tested the waterways ecosystems around Christchurch .

My class has been testing different waterways and stormwater drains around Christchurch. In the a stormwater drain by Waimairi School there was only a quarter of sediment. It didn't have lots of shade around the drain because there are only shrubs and grass.  My reason for this is that they didn't take care of the stormwater drain.  We could not see lots of rocks around because they have been covered in sediment.

This is true because I was testing a stormwater drain and the stormwater drain does not have much sediment and it does not have water in it all the time. Also different people have different opinions about different subjects.

Suggested changes
  • It is important for owners, when they take their dogs for they pick up the dog droppings
  • It is important that you wash your car on the lawn instead of on the concrete near drains
  • Do not build your house on the floodplains

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