## Intro

## Water Supply System Modelling (Tutorial 10)

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.

## Objectives of WaterGEMS Tutorial 10

- Using Pipes & Junctions Flex Tables
- Defining Tank Data (Elevations, Diameter & Inactive Volume)
- Defining & Assigning Demand Patterns to Junctions
- Defining & Assigning Pump Definitions
- Defining & Assigning Pump Controls
- Performing Extended Period Simulation Analysis EPS
- Calculation of Energy Costs Associated with Pumping

## Problem Statement

A local water company is concerned with the **calculation of the energy costs associated with pumping**. Calculate the daily electrical costs for the given distribution network using the following data knowing that the water surface at the reservoir is 70 m :

- Energy price $0.10/kWh
- Motor efficiency = 90 %
- Pump efficiency = 50 % at 2,000 L/min
- Pump efficiency = 60 % at 2,500 L/min
- Pump efficiency = 55 % at 3,000 L/min

#### Demand Pattern

#### Pipe Data

#### Junctions Data

#### Pumps Data

The **tank** is **circular** with a diameter of 15.0 m. The minimum elevation is 99.0 m. The maximum elevation is 104.0 m, and the initial elevation is 103.4 m. The base elevation is 98.0 m, and the inactive volume is 10.0 m^{3}. The elevation of the pump is 70.0 m and it is initially on.

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