cold water Flashcards
what is considered cold water?
water under 70 degrees
what is transpiration?
water moves through plants until it reaches the leaves where it evaporates into the atmosphere
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 evaporation?
water is constantly evaporating from the oceans,lakes,rivers and streams
what is filtration?
there are several types to filter used to filter drinking water
What are springs?
These occur naturally,following directly from the earths surface.
What year was the water act?
2003
What is screening?
First,the water is passed through a series off coarse meshes to remove large debris such as leaves,plants
What is disinfection?
The final stage of the water treatment process is disinfection.this is where small amount of chlorine usally less then 1 milligram per litre of water
What are bore wholes?
These are man-made small diameter wells
What are deep wells?
Usually dug by a machine from below the shallowest imperamble strata.
What are shallow wells?
Historically; shallow wells have been dug by hand and only penetrate the first water bearing strata or aquifer
What is distribution of water supply?
After the water has gone through the treatment process it is distributed to home and businesses throughout the uk
Which is British standard makes recommendations of cold water cistern for a particular property?
Bs6700
The water flow rate from a cold water tap is 8 litres per min what is the flow rate measured per second?
0.13l/s
What is the first stage of the rainwater cycle?
Evaporation
What is the primary purpose of flocculation in water treatment?
To remove color and turbidity
What device prevents backflow in outdoor taps?
Double check valve
In indirect systems, what should cold water cisterns provide?
Adequate storage capacity
Which material is commonly used for modern cold water supply pipes?
Medium-Density Polyethylene (MDPE)
At what depth should a supply pipe be installed?
750-1350mm
What is a key advantage of gravity water distribution?
No pumps are required
In an indirect cold water system, which outlet is usually fed directly by the mains?
Kitchen sink
What is the final stage of the water treatment process?
Disinfection
What is a major disadvantage of a direct cold water system?
Risk of contamination during failure
What is the purpose of a water tower in a distribution system?
To increase pressure through height
Which type of shower valve adjusts for fluctuations in water pressure?
Pressure-compensating valve
Which type of pump boosts water after the shower valve?
Single impeller
What is required for cold water cisterns installed in the roof space?
Structural support
Which tap type avoids mixing water inside the tap body?
Bi-flow mixer taps
