The U.S. has more than 87,000 dams greater than six feet high (and two million overall). While many dams continue to provide benefits such as flood control, irrigation, and water supply, for other dams the cost of maintenance or the negative effects on communities, fish, and tribes justifies their removal.
Dam owners and regulators decide whether to remove a dam by weighing many factors including: the cost of removal and the ability to replace any lost power generation against avoided long-term maintenance; safety concerns; benefits to endangered fish populations; increased recreational and commercial fishing; and restoration of cultural values of nearby tribes.
By 2020, roughly 70% of dams will be more than 50 years old, inviting us to reconsider the value to the public of long-term investments in this infrastructure.
Answer:
Image result for how we can calculate the ratio of area of a country to area of inscribed circle
Required ration=πr2:2r2=π:2.
Explanation:
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It would be <span>D. It was a private company chartered by Queen Elizabeth . The countries and the colonies controlled by East India Company would later be transfer to the British crown but before that it is a company that is chartered to trade with other countries especially to India where they are mostly interested in.</span>
The higher the cloud is, less chance for precipitation to fall because the clouds are way up in the air, so it wouldn't be as thick as lower cloud would be. The lower the cloud is the better chance that you would see precipitation because you can see the thickness, you could like cloud wants to give off all its water in the form of precipitation, and you could see that it is about to rain. In clouds that are high, you would see them there for a long time that you wouldn't see i droplet of precipitation.
