2006-07-18 03:17:32 · 9 answers · asked by COOLGAL 1 in Science & Mathematics ➔ Geography
U can check the link here about the disadvantage...
http://www.adb.org/Water/Topics/Dams/pdf/dam_pdf.pdf#search='disadvantage%20of%20larger%20dams'
2006-07-19 09:32:56 · answer #1 · answered by Handsome 6 · 7⤊ 0⤋
They create a massive man made resevoir that can stretch for many miles that disruptes the natural ecosystem enough. Also it makes it difficult for fish to travel downstream or upstream which can disrupt their mating/feeding patterns and cause their poulations to shrink. There is a lot of energy that is required to make such a big dam, lots of concrete and reinforcement whihc requires skilled engineers if one of them makes a mistake the result will be disastrous compared to a smaller dam. Also diverting a very large river is always a difficult challenge.
Dams doa lot fo good though they can create electricity and save peoples lives by contorlling floods
2006-07-18 11:03:57 · answer #2 · answered by Aaron G 2 · 0⤊ 0⤋
Building a huge dam will result in the river water level rising up very high, and therefore entire villages and cisties in the river's path could get wiped ut. People are generally asked to evacuate the land prior to the dam's building place.
2006-07-18 10:21:52 · answer #3 · answered by al 2 · 0⤊ 0⤋
If not managed carefully, a dam would cause loss of forest, agricultural lands and homes for animals as well as people. A broken dam can flood out any lands immediately in front of or way after it!!!
2006-07-18 11:50:14 · answer #4 · answered by Shadow 3 · 0⤊ 0⤋
When large dams break you have large problems downstream.. When small dams fail, you just say what the hail!
2006-07-18 11:13:31 · answer #5 · answered by Anonymous · 0⤊ 0⤋
the expense of the project, the weight of the water can cause seismic activity, a large surface area means more evaporation from the dam, it takes up more area so you have to site them correctly - you don't want all the water leaking out to lower ground etc etc
2006-07-18 16:53:42 · answer #6 · answered by Kalahari_Surfer 5 · 0⤊ 0⤋
If it fails here goes the downstream. Don't expect the answers like the earth will tilt or break in to 2 pieces etc. Non of those crazy things will happen
2006-07-18 10:54:12 · answer #7 · answered by Dr M 5 · 0⤊ 0⤋
It disrupts the flow of silt as well as wildlife. Some ecosystems depend on the yearly flood to rejuvinate their ecologies,
2006-07-18 10:31:15 · answer #8 · answered by ceprn 6 · 0⤊ 0⤋
more evaporation
2006-07-19 03:09:38 · answer #9 · answered by sloarbag 1 · 0⤊ 0⤋