Question

Which one of the following methods is generally used for design of water distribution system?
1. Manning’s equation
2. Darcy - Weisbach relation
3. Hardy cross method
4. None of the above

Answer 1

Correct Answer - Option 3 : Hardy cross method

Concepts:

Distribution system is a network of pipelines that distribute water to the consumers -domestic, industrial, commercial and for fire- fighting also.

The design of water distribution means- determining quantities of flow and head losses in the various pipe lines, and resulting residual pressures in each pipe.

Following methods are commonly used for the analysis of networks:

1. Hardy Cross Method
2. Equivalent Pipe Method
3. Method of section and circle method
4. Graphical method
5. Newton-Rapson method

                                                                                                                                Hardy Cross Method is most commonly used. This method consists of assuming a distribution of flow in the network in such a way that the principle of continuity is satisfied at each junction. It satisfied the following conditions:

1. The flow entering in a junction or network must be equal to the flow leaving the same.

2. The algebraic sum of the pressure drops around a closed loop must be zero i.e. there can be no discontinuity in pressure.