Water supply in independent house and multistoreyed buildings

Fittings, Fixtures And Services 3(1+2)

Lesson 10 : Water supply system, drainage system and drainage bye laws

Water supply in independent house and multistoreyed buildings

  1. Water Supply In Residential Buildings
    • Public water supply system consists of collection, conveyance, treatment and distribution.
    • Water is distributed for consumption in a building through internal water distribution system.
    • Water supply in a building depends on the size and height of the building.
    • Water piping system may be basically horizontal or vertical systems above the main or pressure tank are called up feed systems.
    • In tall buildings water is pumped to elevated tanks, so that it can flow down.
    • Before designing building water requirement should be calculated keeping the present and future needs of the occupants.
    • Availability of sufficient quantity of water sources like municipal water, ground water and surface water should be found.
    • Normally municipal water is treated and supplied, whereas ground and surface water should be properly treated as per the need of the users.
    • Distribution of water is done with pipes internally in a building.
    • Residential buildings are normally one, two or three –storeyed constructions.
    • Individual residences are connected to the public water main by a service pipe.
    • A water meter is connected to the service main.
    • Once the service pipe emerges from the floor level of the building, it is referred as the rising main.
    • The service pipe can supply to upper floors depending upon the available water pressure.
    • If adequate pressure is not available, then water can be collected in a stump, which can be constructed below the ground floor level and pumped up to the elevated water tanks with a motor.
    • From these tanks, water can be distributed down with gravity pressure.
    • Water storage tanks located on the terrace should be properly covered and protected from contamination.
    • Plastic water tanks are preferred for storage purpose.
  2. e

  3. Water Supply in Multi Storeyed Buildings
    • Water supply pressure from the main will not be sufficient to reach the upper floors on many occasions, so it is necessary to pump it to reach the upper floors.
    • The water requirement in such buildings is very high for both drinking and general use.
    • Thus there is a need to store water and supply it with gravity pressure.
    • The storage of water is possible only on the terrace of the building.
    • Pumping of water from the main becomes a necessity, but continuous operation would be costly and difficult to maintain.
    • To avoid this, storage techniques are employed to prevent continuous pumping. Most common storage systems used are:
      1. The header storage system
      2. Enclosed tank system

      1. The header storage system
        • In this system, water is pumped through the rising main to the terrace of the building, where two storage tanks are placed.
        • One is meant for drinking water, and the other overflowing water from this tank is connected in another storage tank for general use.
        • The storage water is supplied with gravity pressure in separate pipes for drinking and general use.
      2. Enclosed Tank System
        • Normally drinking water is directly taken from the main because storage can lead to contamination.
        • However, storage of drinking water is inevitable due to various reasons for daily use. So it should be stored in enclosed, insulated and ventilated tanks to avoid contamination.
        • There are two common storage systems adopted for this purpose.
        • In one system, two separate tanks are located for drinking water and general use at the ground or basement floor level.
        • The capacity of the tanks at the roof level can be dwelling unit-wise or floor-wise or one for all the dwelling units.
        • In another system, a large tank is located in the ground or basement floor to supply both drinking water and general purpose water.
        • From this tank, water is pumped to the roof level for storing separately for drinking and general use.
        • From these storage tanks, water is supplied by gravity pressure in separate pipes for drinking and general use.
        • In both the systems water is pumped to the roof level with motor.
Last modified: Saturday, 30 June 2012, 7:24 AM