Dans

In the Environmental Management class we made a research of dans and we learned the good things and bad things they have.

Advantages

Disadvantages

The building of dans is important to provide energy, to prevent flood, to store water and to improve navigation. But the building of Large dans is important since they guarantee supplies during times of low rainfall and periods of high demands. They provide massive power generation. The large dams are always controversial. The water supplies are assured throughout the whole country. In addition the cultivated area of Egypt has doubled from 4 to 8.

The large dans are very expensive. To build them they need a lot of space and that cause loss of habitat. 1.2 million of people were forced to move from their homes, relocation of people. Dans are places were the mosquitos thrive, they reproduce there. There are less sediments and that is really bad for farming. In addition the risk of upstream of earthquake and landslides increased. Also farmers must spend more on fertilizers to maintain crop yields.

The things that could be avoided are that larger dans are more expensive, so if they build a smaller or a normal size dans that would be more cheap.

There will be less natural environment destruction and the people wouldn't move from their homes since they didn't need so much space. Farmers wouldn't spend so much money on fertilizers, they only spend the necessary.

El Carrizal is located dam in the upper middle course of the Tunuyán River, in the north-central part of the Province of Mendoza, Argentina, upstream of the city of Rivadavia. Next to the lake there are 2 locations El Carrizal on the west bank and Villa San Isidro on the east bank. Its reservoir measures about 15 × 5 km, and the maximum water level is at 785.5 meters above sea level. it is used to regulate the flow of the Tunuyán River, which has glacial sources from the Andes, and to irrigate a very arid region. The water mirror is a tourist destination, where you can take a fishing, windsurfing, sailing, etc. Camps are held on its banks. Over time the reservoir has decreased its retention capacity due to the large accumulation of sediments, which affects the distribution of water in its area of ​​influence.