water Flashcards
What is cold water?
Fed directly to the point of use, without the need for storage tanks.
what are the 5 stages of the water treatment process?
screening, flocculation, sedimentation, filtration, disinfection, distribution of water supply.
what is evaporation?
This is where water is constantly evaporating from the oceans, lakes, rivers and streams.
what is precipitation?
Another word for rain when water vapour precipitates condenses back into water droplets and falls on the earth as rain.
What is disinfection?
The final stage of the water treatment. This is where a small amount of chlorine is added to kill off any bacteria that may have escaped all the other processes
What are pressure filters?
They are sometimes used where the need to maintain water pressure without the aid of a pump
What does screening do?
The water is passed through a series of coarse meshes to remove large debris such as leaves.
There are 2 types of cold water systems what are they?
Indirect cold water system, direct cold water system
What year was the water act
2003
What is the rainwater cycle?
This is a natural process where water is continually transferred from the atmosphere to the ground and back again to the atmosphere.
What percentage on earth is fresh water
3 percent
In the UK what percentage of rainfall is collected for drinking water supplies?
5 percent
What are bore holes?
These are man made, small diameter Wells that are drilled directly through the Earth’s surface to a water source where the water is extracted for use.
What is upland surface water?
This is water that has collected in lakes and rivers without passing through the earth’s surface.
What are springs?
These occur naturally, flowing directly from the earth’s surface.
