Which statement is correct with reference to “Grid Iron” water distribution system?

Explanation:

Grid Iron System:

• It is suitable for cities with rectangular layout, where the water mains and branches are laid in rectangles.
• This system is also known as an interlaced system or reticulation system. 

• In this system, the mains, sub-mains, and branches are inter-connected with each other. Thus, this system provides free circulation of water through the pipelines.

• Cut-off valves are provided at each junction point. This is suitable for well-planned towns and cities.

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The advantages of the gridiron system are:

• In case of repairs, a very small portion of the distribution area will be affected.  
• This system provides free circulation of water through the pipelines. Hence, it is not liable for pollution due to the stagnation of water.  
• The head loss is minimum.
• It provides sufficient supply during fire fighting.

​Disadvantages of gridiron system are:

• This system requires more length of pipelines and a greater number of cut-off valves.
• Its construction is costlier.
• The design calculations are complicated and difficult.