Urban Scenarios

Demand and End-use Simulation

Urban Developer represents demand by simulating individual end-uses at the household level. The end-use categories included in Urban Developer are:

• outdoor/variable;
• shower;
• washing machine;
• toilets and
• indoor hand taps

These five end-uses typically comprise 93-98% of household water use (Thyer et al., 2008). End-uses such as baths and leaks are not modelled explicitly, but can be lumped with the outdoor/variable end-use. By separating demand into its individual users this provides the user with the flexibility to use different sources for each of the different types of end-use. The urban demand is represented by a Water Use node. Urban Developer offers two methods for simulating the water use at a water use node, either:

• Average daily model, or

• Behavioural model , with two different configurations:

a) Fixed appliances and occupancy specified for each water use node in the model

b) Randomly sampled values for appliances and occupancy across the water use nodes in the model

Refer to the Water Use (page 117) node for details on how to select between the two different methods for a particular water use node.