Analysing using zones

Introduction

You can group live data points into zones and carry out additional analysis. A zone will probably be a self-contained area of your water supply network, with one, or very few, inflows and outflows. You can use the zone to analyse these inflows and outflows. Any difference between total inflow and total outflow for the zone should be equal to the demand within the zone. Any excess means there is leakage within the zone.

Zones are not related to the Area parameter for the live data point, or the Zone parameter held in some logger file formats. Both of these parameters are for information only. Zones differ from these parameters in that they are independent of individual live data points. A live data point can belong to more than one zone.

A new zone can be created simply by adding the name of the zone in the append line of the grid on the Live Data grid - Zone view.

Editing zones

To edit the zone:

1. Open the Live Data grid - Zone view.
2. On the Live Data Zone View, double-click a zone to display the property sheet.
3. Add live data points to the grid by selecting from the dropdown list in the Identifier column.

   Alternatively, if the Area Code field of the network nodes have been set up to correspond with zone IDs, click the Add Zone Flows button to search for live data points monitoring inflows and outflows from the current zone.

   Note: The Add Zone Flows button is enabled only when there is a current network with associated control.

Graphing zones

To plot graphs:

1. Click the Plot Graphs button .

   If you choose an ID and the file contains the wrong sort of data, or cannot be found or accessed, you will see an error message.

2. To plot graphs for a selection of loggers, select one or more loggers in the list by selecting the entire rows or selecting the cells in the identifier column.

   If there are no loggers selected, data for all loggers will be graphed.

   IMPORTANT: After every change on the dialog, you must click the Plot Graphs button again to redraw the graphs.

Notes:

• When plotting flow values, you can use the Total Flow check-box to switch between individual plots and a single plot of total flow for all selected loggers.

  The factors column can be used for analysing the differences between inflows and outflows. Give all inflows a factor of 1.0. Give all outflows a factor of -1.0. Then do a Total Flow plot to show the net difference between inflow and outflow.

• When plotting pressure, use the Show Pressure Total Head check-box to switch between relative and absolute (taking account of Sensor Level) head.

Comparing live data zone flows with modelled network demand

The net inflow into a zone (calculated from the live data points in the zone) can be compared with the demand assigned to the network on the Zone Demand Profile dialog.

Procedure:

1. On the Live Data grid - Zone view, right-click in the grid and select Profile selected zone to display the dialog.
2. In the dialog, select the items to be used for calculating network demand.
3. Click the Redraw button.

   A graph displaying traces for the net inflow and network demand for the zone will be drawn.

Notes:

• The net inflow into the zone is calculated from the live data points grouped in the zone. The list of live data points associated with a zone can be edited on the Live Data Zone property sheet - Zone page.
• The network demand in the zone is calculated by summing the demand assigned to all nodes with Area Code matching the Zone ID.
• Scaling coefficients entered in the Daily Coefficient and Monthly Coefficient grids in the demand diagram are not included when calculating network demand.