Andrew's Watershed Blog Page

Lake Champlain

Phosphorous mostly gets into water from agriculture and forests lands. The Environmental Protection Agency estimates that 16% of phosphorus going into Lake Champlain comes from forest lands. Agriculture can account for 49% of phosphorous. Stream erosion can account for 16% of phosphorous too. We are doing an experiment to see if phosphorous in water is a good thing with an aquatic plant, duckweed.

Lab steps

We are doing an experiment to see if phosphorous affects the growth of plants. First we put 11 milliliters of water in 4 test tubes. Then we added a small drop of 0.05 liquid fertilizer in all of the the test tubes. After that we put 4 fruns of duckweed in the 4 test tubes. Last, we put the tubes near the window and we have an artificial light source for at night. These are the steps we did to do the duckweed experiments.

Dissolved Oxygen Test 

This week we did an experiment about how much dissolved oxygen there is Cedar Lake. It turned out that there is a little of dissolved oxygen cedar lake which means only a few species can live in the pond. We also took some water from our fish tank to compare the two different types of water. Both the fish and the pond water was at a pretty bad level of dissolved oxygen. We used four chemicals to determine the dissolved oxygen levels. One was manganous sulfate and iodide-azide which made floc and made the water cloudy and made the water an orange/yellow color. Then we put sulfamic acid which dissolves the flock and changed the color to a more rusty yellow color. The last thing we put in was sodium sulfate. We cept putting drops of sodium sulfate until the water was clear. To determine the dissolved oxygen level you have to count the drops. For the pond water we put 15 drops in and for the aquarium we put 9 drops in. This means that the pond water is at 3 mgl and the aquarium is at 2 mgl. In the state of vermont a body of water should have no less than 7 mgl. That is why I do not think the pond is that healthy in regard to dissolved oxygen


The land and water interact by when the water takes things from the sides of where the land and water meet and erodes shaping the land. Another is if the culvert is not in the right place on a dirt road so the water erodes the side of the road. If there is no trees or rocks near a river then the rate that the erosion happens is much higher because there is nothing to hold the dirt in so it can get in the river faster. Some point source pollution is if a car is leaking gas oil etc. because then it will go to a grate and end up in a river. Also my Grandpa sprayed ant fluid on his driveway because there was a lot of red ants and he didn't want them in his house but when he sprayed the fluid that will also go to a grate and get to a river. At one farm I went to the cows walk through the water with dirty legs and the cow manure in high in nitrogen and phosphorous and that is not a good thing to have in a river. Another thing is in peru NY (where my grandparents live) the sewage goes to a plant and they separate the liquids and solids then they put the liquids into the ausable river then treat the solids and put them in the river too. When the sewage leaves the point where they dump it, it turned into nonpoint pollution meaning you cannot point to it. Also when a car leaks and it gets to a body of water then it turns into non point pollution. These are some examples of how water and land interacts, point source pollution, and nonpoint pollution.

Multiple sources of Pollution

The land and rivers interact mostly by the land polluting the river because of the choices we as humans make. If you have a garden close by to a river or body of water and you put fertilizer on the garden to help the plants grow you also help bluegreen algae or cyanobacteria grow in the river or body of water. Also if a car is leaking gas or oil or some other unnatural fluid or some other unnatural. It will find its way to the lowest point and get to a river or body of water. Washing your car on paved driveway or or impervious surface the chemicals will get into the ground make its way into river. If a truck is carrying salt and spreading on the road it will find its way into a body of water or river.As long as we are careful about the choices we can keep rivers ponds and lakes safe.

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