Water Supply System Modelling using WaterGEMS (Ex.2)

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Water Supply System Modelling using WaterGEMS (Ex.2)

Intro

Water Supply System Modelling (Tutorial 2)

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

The ductile-iron pipe network shown in the following figure carries water at 20◦C. Assume that the junctions all have an elevation of 0 m and the reservoir is at 30 m. Use the Hazen–Williams formula (C = 130) and the pipe and demand data in the following tables to perform a steady-state analysis and answer the following questions :

WaterGEMS Tutorial 2 - Network Layout

Pipe Data :

WaterGEMS Tutorial 2 - Pipe Data

Junction Data :

WaterGEMS Tutorial 2 - Junctions Data

Part 1 : Which pipe has the lowest discharge ? What is the discharge (in l/min) ?

Part 2 : Which pipe has the highest velocity ? What is the velocity (in m/s) ?

Part 3 : Calculate the problem using the Darcy–Weisbach equation (k = 0.26 mm) and compare the results.

Part 4 : What effect would raising the reservoir by 20 m have on the pipe flow rates ? What effect would it have on the hydraulic grade lines at the junctions ?