VOSWMM

Pollutants

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.