WaterWare Release Notes
    Release Level 5.0
    Release Date 2005 06
    Revision Level 1.0

STREAM Surface Water Quality Model

STREAM, a basin wide dynamic surface water model for open channels is the central water quality model in WaterWare. The model uses the hydraulic results (flow) from the WRM water resources model as the driving input.

The entry point is a selector of scenarios, which can be sorted and filtered by several properties such as name, author, modification date, or location. Another option here is the possibility to create a new scenario with an empty template, or by copying an existing one. The first step there is to select the WRM scenario to be used as the basis for a new STREAM model scenario.

Once selected, the summary information about a scenario includes its name and a short description, the author (the only user that can change or delete that scenario), location, and start date for the simulation and water year.

Model parameters at the scenario level include the choice of pollutants, the decay characteristics (specified as half time) and water quality standards, as well as choices on model equations to be used.
Initial concentrations and pollutant load or emission data are specified on a node level.

To select a node from the existing WRM network scenario, a selector shows all relevant node types

  • start nodes
  • demand nodes
  • control nodes
for which STREAM specific data and time series have to be specified.

The node type specific data include:

  • For Start nodes, an initial concentration for DO, BOD, and the pollutant are specified.
  • For demand nodes, pollutant load is specified.
  • Control nodes are passive observation points that keep track of any violations of the water quality standards.

The model results are summarised in tables for average, minimum and maximum concentrations for DO, BOD, and an arbitrary pollutant (conservative or first order decay).

Parallel to the tabular results, a color coded interpretation of water quality parameters along the reaches of the river network is shown, with a selection mechanism to switch between water quality parameters:

  • average and minimum DO;
  • average and maximum BOD;
  • average and maximum tracer or user selected pollutant.

Detailed results are shown on a node basis, for control nodes only. Tabular data include the basic statistics of the time series, plus the number and % of standard violations. The output time series include:
  • Flow (inherited from WRM);
  • BOD;
  • DO;
  • User defined pollutant.

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