Network or Catchment Scale

The Systems Framework combines water, wastewater and stormwater networks with waterways and catchments in an integrated network. A wide range of spatial and temporal information generated by the lot scale analysis is combined by the transition scale processes as inputs to the network analysis (see Figure 1).RegionalCatchment

Figure 1: Schematic of the Systems Framework with a focus on the Network and Catchment Scale

The movement of water, sewage, recycled water and stormwater throughout a region is simulated over a chosen planning horizon using multiple replicates of climate sequences that are generated using Monte Carlo processes. This simulation of integrated networks and catchments allows analysis of peak flows in trunk infrastructure, assessment for regional sewage discharges, stormwater runoff, water demands, stream flows, energy use, economics, flooding and pollutant loads.

This scale of analysis includes water sources from ground water, surface water sourced from regional river basins, shared surface water with other river basins, wastewater reuse and stormwater harvesting. The analysis utilizes stream flows, reservoir storage volumes, wastewater discharges and information about the operation of water systems as inputs. (see Figure 2 for an example of the combined information at the network of catchment scale).

BallaratNetworkFigure 2: Example for water supply networks and land use catchments

Back to Systems Framework for Big Data

Dr Peter Coombes

Dr Coombes has spent more than 30 years dedicated to the development of systems understanding of the urban, rural and natural water cycles with a view to finding optimum solutions for the sustainable use of ecosystem services, provision of infrastructure and urban planning.

Connect with Peter

Related Articles

Transition Scale

The sequences of water use, wastewater flows and stormwater runoff from local scale analysis are combined for each zone or sub-catchment using town planning projections and replicates of spatial climate sequences to combine inputs. Zones or sub-catchments are chosen...

read more


A large number of workshops on the philosophy of local scale processes as a linked component of regions were held during the early 2000s that included earlier versions of PURRS (Probabilistic Urban Rainwater and wastewater Reuse Simulator) model. The PURRS model uses...

read more

Local Scale

The Local Scale processes in the Systems Framework are utilised to capture the distributed local behaviours of people, buildings and land uses that drive the performance of entire system in response to the layers of Big Data inputs (see Figure 1). Figure 1: Schematic...

read more