Cold water supply

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Cold water supply

  1. 1. CB 205 PLUMBING SERVICES UNIT 1 COLD WATER SUPPLY Prepared: Mrs. Izyan Wahida Binti Zainuddin Civil Engineering Department Polytechnic Kuching Sarawak
  2. 2. RAIN / HYDROLOGY CYCLE
  3. 3. PROCESS IN HYDROLOGY CYCLE evaporation transpiration condensation precipitation runoff
  4. 4. evaporation • Change of state in a substance from liquid to a gas. transpiration • Evaporation of water from plants condensation • Process whereby vapor in the atmosphere is returned to its original liquid state. Precipitation • Tiny condensation particles grow too large and fall to earth. Run off • Occurs when there is excessive precipitation and the ground is saturated.
  5. 5. SOURCE OF WATER SUPPLY -Lakes -Streams -Rivers -Reservoirs SURFACE -Wells -Springs UNDERGROUND
  6. 6. WATER SAMPLE EXAMINATION Acid – litmus paper turns red •A substance containing hydrogen which can be replaced by other elements. Alkali – litmus paper turns blue •A substance which will neutralize acid by accepting its hydrogen ion
  7. 7. WATER HARDENESS • Hardeness means it is difficult to obtain with a soap • Hard water is water that has high mineral content which are high concentrations of Ca2+ and Mg2+ ions. • Not harmful to one’s health but can pose serious problem is industrial settings. • Lead galvanic corrosion in plumbing system
  8. 8. WATER SOFTNESS • Reduction of concentration of calcium, magnesium and other ions in hard water. • Taste salty • Reverse osmosis, distillation and deionization.

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