Water Quality Conclusion

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by 7marip
Last updated 4 years ago

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Water Quality Conclusion

Water Quality Conclusion

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We conducted our stream study at the Tercia Brook in Chappaqua, and we did our soil study in the forest next to Robert E. Bell Middle School. My group was located in the furthest area of the stream which had baseball field and parking lot next to it, as well as a bridge in the stream.The Tercia Brook’s source is near Temple Beth El in Chappaqua, and continues for a short stretch after the bridge. Near the Tercia Brook the land is used institutionally and residentially. There is a police station and school found nearby the stream, as well as many homes. The Terica Brook is a classified B stream. The stream’s pH level was 6.75 and met the standard for not less than 6.5, but not more than 7.0. The stream’s dissolved oxygen was 12.35 mg/L and met the standard of not less than 7.0 mg/L. However, the conductivity was supposed to be 25-750 ppm, but was 3,031 ppm. The turbidity was 4.28 NTU and met the standard of not exceeding 5 NTU. The flow rate was 0.12 m/s, which met the standard of 0.5 m/s-3.0 m/s. The level of nitrates in the stream was 1.25 ppm and the level of phosphates was 0 ppm, this met the standard of not exceeding 10 ppm. However, the temperature of the stream was 18.28 degrees celsius, when the NYS standard said it should be no more than 13 degrees celsius. In our section of the stream we found only three sensitive macroinvertebrates, a stonefly larvae. We found two crane fly larvaes which were somewhat sensitive. However, we found many tolerant macroinvertebrates. We found a blackfly larvae, a leech, and a midge fly larvae. From this information we can tell that the water quality is very poor.When water is cooler is supposed to be capable of holding more dissolved oxygen; however, this was not the case. Additionally, when the dissolved oxygen level goes down, the pH is meant to go down as well; this was not apparent because we had a high dissolved oxygen and relatively high pH. Also, we had a very high conductivity rate, which did not make sense because we had such a low flow rate. These data conflicts were results of sources of error such as the day that we did the testing. We went to the stream and did these tests multiple days where the weather varied greatly, and this could have thrown off the average of our data. Our data is proven to be unreliable based on all of the conflicts that have appeared in our data. When water is cooler is supposed to be capable of holding more dissolved oxygen; however, this was not the case. Additionally, when the dissolved oxygen level goes down, the pH is meant to go down as well; this was not apparent because we had a high dissolved oxygen and relatively high pH. Also, we had a very high conductivity rate, which did not make sense because we had such a low flow rate. These data conflicts were results of sources of error such as the day that we did the testing. Overall, it is apparent that the Tercia Brook has very poor water quality. We know this because of the lack of macroinvertebrates in the stream, and because of the many conflicts that occurred between the data we collected.

This is where the Tercia Brook begins. This body of water is located near Temple Beth El.

The stream countinues flowing and then passes the Chappaqua Library

The stream then flows from the Chappaqua Library and continues alongside the baseball field and Town Hall.

The stream continues and passes underneath the bridge, and runs alongside a long parking lot.

The stream continues on while passing the train tracks. Then the stream comes to an end.


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