how much water, in cubic meters, need a hidraulic dam for produce one kilowatts of electricity?
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.
319479
all you want, just a little at a time. Try a concrete boom pump if you want any kind of volumne. A Putzmister, 52 meter can pump 200+ cu yards an hour.
496124
Calculate the electricity.
309526
It is as simple as a tidal wave.  How much more energy do you need?
770429
12\n\n1 Kc / C per litre per degree (litre=1kg)
349291
Most forms of electricity generation involve heating water (burning fossil fuel, solar power, etc) to form steam that turns a turbine.  The excess heat releases a large amount of wasted energy, energy not used to produce electricity.  Hydroelectric power, on the other hand, uses only moving (cool) water to push the turbine, so no heat energy is wasted and no fuel is consumed.  The main problem with hydroelectric power is that rivers end up dammed to collect enough water to move the turbines; dams alter the natural hydrology of their environment by flooding low lying areas, slowing waterflow, and impeeding animal migration.
616186
The potential energy, stored by the water due to its height, converts to kinetic energy as it falls. This turns the turbines which in turn create electrical energy.\n\nThis conversion requires the use of a generator (the rotation of the coils of wire that cuts through the magnetic fields of some magnets results in electricity forming; refer to Fleming.)
341004
i think you are right, you only need one.\n\nw = h*c/wavelength-eV\n\nboth should give the same w, about 1.9eV, \n\nwavelentgh = h*c/w
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.
699114
1 cubic meter = 219.969 248 299 gallon [UK].\n1 cubic meter = 227.020 744 565 gallon [US, dry].\n1 cubic meter = 264.172 051 242 gallon [US, liquid]
495414
125% the density of water.
292406
mmm... Small hydro. They are really works better than the big ones, BUT!!!\nYes, But... i don't know in which country you live, but it needs a good slope in in rivers and a snow-base runoff river. i mean all the time have some proper discahrge. you can use their canal or penstock for irrigation purposes, too. And finally you can make some diversion barrier or dam with local material and don't affraid about flood damage. if it occures, you can easily repair your dam!\nAs i told you, in Small HPP you have a big "BUT...". note to bellow "BUT..."s , mostly in economics:\n\n1) Hydromechanical instruments production must be in your country. Specially their good maintanence interactions. if your country doesn't produce itself, you have the first problem. Buying them, operating them and maintanence them, all of them must be sonsider.\n2) Location of this HPP are almost in steep part of a catchment and in upstream. Because of that the main part of their invastement is related to access roads. Cutting and filling and some times making bridge, makes your HPP Non Feasible.\n3) Access to a proper power line, proportionate to power generate by your HPP.\n\nis it enough?\nyou can find some more in ex-Yugoslavia. Because they try it before.
386344
1067 gallons/minute, approx.\n\nSee reference
56978
water, water and more water
1011895
You will find this an interesting document:\nhttp://www.ewaonline.de/downloads/Barcelona_programa%20defi.pdf#search='dealing%20in%20the%20uk%20like%20of%20wat%20for%20water'
751939
you can either do the math, look it up on a chart or go here:\n\nhttp://leebrewery.com/hydromet.htm\n\nand use the java-calculator.
596165
Given a fixed power of heat input water would take longer due to its specific heat capacity being large.  4180Joules/kg/degree, compared with 450 for iron & 880 for Aluminium (figures STRICTLY only from memory and not to be relied on)\nOther than that are consideration of good conduction of heat in metals versus convection transporting the heat quickly within the water.\nAlso practically speaking, you might need to allow for evaporative heat loss from the water surface.