The problem with Lake Powell (TOEFL essay) The reading passage and the lecture are both about Lake Powell which is the second largest man-made reservoir located in the border between Utah and Arizona states. The reading provides three reasons why this lake cannot be drained, however the lecturer refutes all these reasons by providing several proofs. First of all, the reading claims that Glen Canyon National Recreation Area will lose tourist attraction if Lake Powell drained. On the other hand the lecturer believes that Glen Canyon is very attractive for tourists it self and, moreover, it will attract more tourist than before. Therefore, it would not damage the revenue of the surrounding area. Secondly, the reading points out that Lake Powell is a big reservoir that gives water for surrounding area and this is a good water storage facility. However, this point is rebutted by the lecturer. He is of the opinion that amount of water in Colorado river is more than enough for environmental needs, because the level of evaporation is only 6,9%, therefore existence of Lake Powell is actually not necessary. Finally, the author of the reading passage mentions that lots of species will exterminate after draining Lake Powell. The lecturer, on the other hands feels that the dam impacts more dramatically for the environment. The Colorado river will more likely become small and weak.