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Go With The Flow: Are Mountain Stream Channels Shaped by Flood and Drought?
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When humans divert water from mountain streams, there is less water in the streams at certain times. The scientist in this study wanted to know whether stream channels are changed as a result of having less water at certain times, and normal flow at other times. The scientist wanted to know what happens to the channel when water is diverted out of it.
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When scientists develop plans to do research, those plans influence and limit what they will discover. If a scientist decides to measure something, that is all he or she can report about. For example, the scientist in this study wanted to know whether streams changed from their normal shape when water was diverted from them and into another channel. To find this out, she measured the width of the streams'channels. After the research was done, she reported that she should have also measured the channels'depth and the size of the stones in the channels. Because she did not measure those things, she could only report on changes in the channels'width. A scientific study does not always provide the complete answer to a question. It often raises other questions that can be addressed in future research.
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When humans make changes in the environment, they are not always sure what impact those changes will have on the environment. In this study, the scientist wanted to know if steep mountain stream channels are changed by diverting water from them. In the Western United States, water is often scarce where people live. To provide water for people living in cities where water is scarce, it is diverted from mountain streams. It is piped through tunnels across the mountains to reservoirs for storage and human use. When this is done, the existing mountain streams have a reduced flow, and sometimes may even be dry.
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