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Doctors Medicines MCQs Q&A

  1. Dead-end
  2. Grid-iron
  3. Radial
  4. Spiral
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1 Answers

Option 4 : Spiral

Concept:

Different methods of laying out water distribution system:

1). Dead-end system:

  • In the dead-end system (also called tree system), one main pipeline runs through the centre of the populated area and sub-mains branch off from both sides.

  • The sub-mains divide into several branch lines from which service connections are provided.

  • It is suitable for old towns and cities having no definite patterns of road.

[ alt="F1 Abhayraj Anil 05.02.21 D5" src="//storage.googleapis.com/tb-img/production/21/02/F1_Abhayraj_Anil_05.02.21_D5.png" style="width: 259px; height: 161px;">

2). Radial system:

  • In this system, the whole area is divided into a number of distribution districts. Each district has a centrally located distribution reservoir from where distribution pipes run radially towards the periphery of the distribution district. 

  • It gives quick service and design calculations are much simpler.

[ alt="F1 Abhayraj Anil 05.02.21 D6" src="//storage.googleapis.com/tb-img/production/21/02/F1_Abhayraj_Anil_05.02.21_D6.png" style="width: 406px; height: 195px;">

3). Grid-iron system:

  • In this system, the main supply line runs through the centre of the area and sub mains branch off in perpendicular directions. The branch lines interconnect the sub-mains. 

  • This system is ideal for cities laid out on a rectangular plan resembling a gridiron.

  • The main advantage is the free circulation of water, without any stagnation or sediment deposit, minimises the chances of pollution due to stagnation.

[ alt="F1 Abhayraj Anil 05.02.21 D8" src="//storage.googleapis.com/tb-img/production/21/02/F1_Abhayraj_Anil_05.02.21_D8.png" style="width: 275px; height: 200px;">

4). Circular or ring distribution system:

  • The supply mains are laid all along the peripheral roads and sub mains branch out from the mains.
  • Water can be supplied to any point from at least two directions.

  • In case of fire, a larger quantity of water is available, and the length of the distribution main is much higher.

[ alt="F1 Abhayraj Anil 05.02.21 D7" src="//storage.googleapis.com/tb-img/production/21/02/F1_Abhayraj_Anil_05.02.21_D7.png" style="width: 355px; height: 219px;">

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