2004-5-3
This is the VOA Special English Agriculture Report.
The power of flowing water can be used to produce electricity.
This can be done anywhere there is water and a hill for it to flow
down rapidly.
Micro-hydro systems produce electric power from water. These
small water-powered systems can produce up to fifteen kilowatts of
electrical power. This is enough to provide electricity for a
village of fifty to eighty houses to use to power lights and small
motors. It does not provide enough power for industrial uses.
Micro-hydro systems are important for villages that are near water
and do not have electric power.
Before you begin the project, you should make sure that people
living near you approve. People protest if there is less water for
them to use for their crops or for washing clothes.
Building or buying a micro-hydro system requires planning. First,
someone has to estimate the amount of electrical power the falling
water can produce. It is a complex process. It is necessary to find
out how far the water drops and to measure the amount of water that
flows past an area each second. These numbers can show how much
electrical power can be produced. Then you can buy or build a
micro-hydro system of the right size.
Next you need to decide if falling water needs to flow inside a
pipe or can flow freely. A long pipe costs more, but the water is
easier to control. Even if the water flows freely, it must enter a
piece of pipe just before it flows into a machine called a turbine.
The water flowing through the pipe turns a large wheel in the
turbine around. The turbine sends the power to a generator that
creates electricity.
Heavy rain can cause a problem for a micro-hydro system. The rain
carries grass, leaves and other material into waterways. This can
cause the turbine to stop turning. The problem can be prevented by
placing steel bars in the pipe before the water flows into the
turbine. These steel bars catch the material before it can damage
the machine.
People who can use flowing water to produce electricity have a
free supply of energy. You can get more information about projects
like this from the group Volunteers in Technical Assistance. VITA is
on the Internet at vita.org.
This VOA Special English Agriculture Report was written by Gary
Garriott.