Muddy lake
I am a scientist specialized in aquatic pollution, I would like to explain some basic facts concerning the case of the "muddy lake". The issue of this case is to know if the engineer-contractor is responsible for the turbid water of the lake. Before answering the question, we have to know all the elements of the case. The question is why we have turbid water after expensive work done by professional, is it the company fault or is it another factor.The community hired scientific consultants to make some quick tests of the water and they determined that the year round-turbidity was due to fine clay particles, which came from an abandoned factory. There were almost no algae and the problem was due to a great amount of suspended mineral particles. It wasn't a biological problem. On this base, the community engaged an excellent and expensive engineering contracting firm in order to stop the run off of the clay into the lake. They did their work, and the lake was not turbid until the next spring. During all the summer the water was turbid, reaching a peak by early summer. Although the lake water seemed to clear up over the winter and early spring of the following year, the turbid water wa
The engineering firm claims that it wasn't their fault. In spring, microorganisms produce a large production of organic matter. What is the truth? How can we explain that the water became turbid again? This problem can easily be explained scientifically. The community is outraged, and the firm loses a good reputation even if their work was good. I encourage them to do further studies on the lake ecosystem, and see how the water could become clear. Plants need light to carry out photosynthesis (Aquatic Pollution: An Introductory Text,(18), Third edition, E. There are natural light-dependent biological processes that occur. We can do the analogy with terrestrial environment, during the late spring and early summer the nature is alive with plenty of flowers and leaves on the trees (long sunny days), and in the winter every thing seems dead (very short days). In a very high turbid lake, the biological activity is very limited due to the lack of light. They did not think about the consequences, and they forgot the main point. A few mixing (a shallow mixed layer) is often associated with an important primary productivity. The first study was not complete, and we see the consequences for the both parts, the community and the engineering firm. I think that the first consultant did an error by neglecting the biological processes. In our lake, the biological processes started with an increase of light. What will be the result of a modification of the lake ecosystem? Once the particle runoff stopped, the light would penetrate into the water.
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