Water Supply System Modelling using WaterGEMS (Ex.1)

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Water Supply System Modelling using WaterGEMS (Ex.1)


Water Supply System Modelling (Tutorial 1)

Mastering water supply system modelling using computer software is essential for engineers these days. TheFluidMechanic would help you with the modelling process through a set of water supply systems tutorials. For this tutorial, Bentley WaterGEMS SELECTseries 5 will be used. You can follow this step by step tutorial (including screenshots) to understand how water supply systems are modeled from scratch. Finally, you can download the WaterGEMS hydraulic model for this tutorial at the end of the post to double check your work and make sure that everything is working all right. Lets start with our tutorial.

Problem Statement

A pump station is designed to supply water to a small linen factory. The factory, at an elevation of 58.0 m, draws from a circular, constant-area tank (T-1) at a base elevation of 90.0 m with a minimum water elevation of 99.0 m, an initial water elevation of 105.5 m, a maximum water elevation of 106.0 m, and a diameter of 10.0 m.
Three main parallel pumps draw water from a source with a water surface elevation of 58.0 m. Two pumps are set aside for everyday usage, and the third is set aside for emergencies. Each pump has a set of controls that ensure it will run only when the water level in the tank reaches a certain level. Use the Hazen–Williams equation to determine friction losses in the system. The network layout is given in the following figure; the pipe and pump data are given in the following tables.

WaterGEMS Solved Examples-Fig 1

Pipe Data :

WaterGEMS Solved Examples-Pipe Data

Pumps Data :

WaterGEMS Solved Examples-Pump Data

Part 1: Can the pumping station support the factory’s 20 L/s demand for a 24-h period ?

Part 2: If there were a fire at the linen factory that required an additional 108 L/s of water for hours 0 through 6, would the system with the pump controls given in the problem statement be adequate ? Supply the extended-period simulation report describing the system at each time step.

Part 3: How might the system be operated so that the fire flow requirement in part 2 is met ?