About water quality simulations

A water quality simulation can be used to track the movement and concentration of a single substance or multiple substances in the network over time.

The substance can be modelled in two ways:

In addition to chemical transport, the water quality model can be used to calculate:

For technical details on the calculation of water quality simulation results, see Dynamic Water Quality Model

Turbidity analysis can also be carried out as part of a water quality simulation. See Water quality - turbidity analysis for technical details.

For details on the model parameters required for a water quality simulation, see Water quality parameters and About water quality mixing controls .

Water quality simulation results

For general information on viewing simulation results, see Results.

There are additional results for nodes, which are not available when carrying out a normal run. These are:

If one or more trace nodes are selected in the Water Quality Options dialog the following results are also available for nodes:

There are additional results for nodes and links when carrying out a turbidity analysis. These are:

Notes on dominant source results

Dominant source results are derived from the trace percentage results. Results are numerical but are displayed in the nodes results grid as a string which includes the name of the trace node acting as the dominant source, or 'Mixed', 'Doubled' or 'Unknown' if a dominant source cannot be derived.

Numerical value Results grid value Description

-2

Mixed

Sources sum to 100% but no trace exceeds 50%

-1

Doubled

Sum of source percentages exceeds 100%

0

Unknown

Sum of source percentages is less than 100%

1, 2, 3... 10

Tr <trace number>:<trace node ID>

e.g. TR 7:RZoneA

Sum of source percentages equals 100% (within a 5% tolerance) and the reported source node provides > 50% of water reaching the node.

The numerical value is used when graphing results involving dominant source results.

When using SQL queries compare the dominant source result with a string.

For example:

sim.TRACE_DOMINANT = 'DOUBLED'

sim.TRACE_DOMINANT LIKE 'Tr 7*'

sim.TRACE_DOMINANT MATCHES '.*RZoneA'

Note that the trace node string includes a space between the Tr and the trace number, except for trace 10 which is written as 'Tr10'.

See SQL Syntax for more details on the use of operators in queries.


Scheduling a water quality simulation

Simulations

Water Quality Model

Water Quality Parameters

Water Quality Mixing Controls

Water Quality - Turbidity Analysis

Creating and Scheduling a Run

Rescheduling a Run

Water Quality Options dialog