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.
1. Diversity
2. Pollutants
3. Runoff
4. Erosion
5. Agriculture
6. Vegetation
7.
8.
I don’t know 7/8 right now but I will keep working on it.
Answer:
Correct answer is direct democracy.
Explanation:
Athenians created many institutions, among which the most important one was Assembly (Ecclesia). It brought all important decisions in the country. All males who were citizens of Athens above the age 18 had the right to vote and to participate in the decision making process.
