disadvantages of building a dam?
91009
It obstructs the natural flow of water, flooding areas previously dry and depriving downstream areas of water.
649639
Disadvantages: \n\nA few accidental poisonings worldwide every years.\n\nA few hundred thousand individual animals poisoned, none threatened.\n\nAdvantages: \n\nEntirely responsible for our ability to feed the world. Without pesticides we could not produce enough food to feed even 1/10th of the people alive today. The rest would starve because crops would be eaten by insects.\n\nEntirely resposnible for controlling insect born diseases. Without pesticides millions would die every DAY from diseases such as malaria, typhoid and West Nile Virus.\n\nEnables us to maintain huge wilderness reserves. Without pesticides we would have to clear all wilderness areas for food production and as a result kill all wild animals and plants.\n\n\nYeah, I think we can probably say the benefits outweigh the disadvantages, since without pesticides we would have the same disadvantages multiplied a thousand fold and none of the advantages.
261598
They restrict the width of where the water can go. The narrower the area, the faster the flow.
1133769
Disadvantages:\n1. other people might get hurt\n2. it will turn out to be a fight between the persons involved\n\nAdvantages:\n1. it might serve as a room for improvement\n2. could teach the person to be firm and strong\n\n* Five answers for each is too long.. Hope two answers for each would help.
423132
It all depends on the area where you live. Like people in Florida would benefit most from Solar energy. People living near dams would benefit more form water energy. Wind energy would benefit people who live in the mountains. It all has to do with the geography of the land. But dealing with fuel options... I'm stumped!
900352
Also if there is a landslide say beside a damn... then a flood could happen , if the dam is takn out with the land slide.. then all the water held back by the dam will be released resulting in a flood.
181433
I myself hate it when I have to answer like this.......that it depends on many factors...\n\nBut in this case it really does! You see, designing the features require complete knowledge of the area. You may then refer to any geotech engg book and will find some good answer. Even a Foundation of Geotech engg book will be enough
677256
I don't really know.... my guesses would be regulating the fish population. I think a negative effect might be that fact that because they're an endangered creature wherever they build their nests, they can't be moved regardless of how inconvienet it is to people.
837311
Dams and levees change the course of rivers.  Farmig, forestry, and suburban development lead to erosion.  Mining can change the forms of mountains.
523738
Worse,  Man has failed miserably to improve the society it has created.  Wars have increased, divorce in America is around 50%, murder has tripled in the last fifty years, abortion has claimed million of babies, yet mankind tries to patch up the dam with paper.  Not to say the chaos in some other nations, just as the Bible predicted.\nPretty soon the dam will collapse totally.
939634
The building of the first beaver dam had to have been a great benefit to all beavers, but since your question has such far reaching implications it would be impossible to address them all on YHanswers.
279804
Are you referring to hydroelectric power?\n\nWater behind the dam is stored energy called potential energy because it has the potential to do work, but isn't doing any work at the moment.  As the water flows down through the turbines of the hydroelectric plant, it is kinetic energy, or energy that is actually doing work.\n\nThe turbine spins a generator, which is connected to the power grid through transformers.\n\n\nA newer, experimental variant of hydroelectic power is using large volumes of water in man-made, elevated lakes to store energy.  During non-peak usage periods, such as late at night, electric pumps will pump water into these lakes.  Then, during peak usage periods, during the day (particularly the afternoon), the water is allowed to flow down through pipes to turbines to generate electricity again.   It's not a very efficient system, but does offer a possible way to store electricity until it's needed.
251822
hydro = water\nso \nelectic enery from water.\nlook up Hover Dam
450500
dams aim to receipt the surplus water at the rainy seasom so it's water can utilize at dry season. The utilizing to change the natural distribution water to demand condition. And other used such as generating a generator to produce electric.\n\nBArrages created just to boosting up the water level or face irrigate so the water can irrigating the longest place that we designed.
401765
It depends on the speed of the water as it goes through the dam which depends on the pressure on the water behind the dam, which depends on how deep the water is behind the dam.  It all depends on how big the dam is.
801669
There is a lot of possibilities starting from the simplest one which is wind generator.  More complicated would be water generation where a usually dam is build and potential energy of the water accumulated behind the dam moves water through turbines and generates power. Some other may include thermal energy of the earth. If you drill deep enough you will get to the earth crust zone where temperature is high to produce steam and this steam is converted (generated) into the electric power. Ocean waves are also source to generate energy.
661803
Because of the pressure of water is more at the bottom of the dam. Think of the tonnes of water the dam is holding at the base. \n\nHope this helps...