Click the Pollutants button to open the Pollutant Editor window.

Button Description
Add one pollutant
Delete selected pollutants. Please note to use Ctrl and Shift keys for multiple selection.
Import a group of pollutants
Export all the pollutants

  1. Name: This is the name assigned to the pollutant, which serves as its identifier in the model.
  2. Units: It specifies the concentration units in which the pollutant’s concentration is expressed. Options include milligrams per liter (mg/L), micrograms per liter (ug/L), or counts per liter (#/L).
  3. Rain Concentration: This property represents the concentration of the pollutant in rainwater, typically measured in the chosen concentration units.
  4. GW Concentration: This property defines the concentration of the pollutant in groundwater, also measured in the selected concentration units.
  5. I&I Concentration: Concentration of the pollutant in Infiltration/Inflow (I&I) events, often expressed in the concentration units.
  6. DWF Concentration: This is the concentration of the pollutant in dry weather sanitary flow (DWF). However, this value can be overridden for specific nodes in the conveyance system.
  7. Initial Concentration: It indicates the concentration of the pollutant throughout the conveyance system at the beginning of the simulation.
  8. Decay Coefficient: It represents the first-order decay coefficient of the pollutant, typically measured in inverse days (1/days). This coefficient describes how the pollutant degrades over time.
  9. Snow Only: A check on or off option that specifies whether pollutant buildup occurs only when there is snow cover. The default is usually off.
  10. Co-Pollutant: This field allows you to specify the name of another pollutant whose runoff concentration contributes to the runoff concentration of the current pollutant. It establishes a relationship between pollutants.
  11. Co-Fraction: It defines the fraction of the co-pollutant’s runoff concentration that contributes to the runoff concentration of the current pollutant. This parameter quantifies the extent of influence from the co-pollutant.

An example use case for the co-pollutant relationship is when the runoff concentration of a heavy metal is a fixed fraction of the runoff concentration of suspended solids. In such a scenario, suspended solids would be declared as the co-pollutant for the heavy metal.