Detailed Overview of landuse_getCoPollutLoad Function in SWMM5 🌧️🔍📊

 

Detailed Overview of landuse_getCoPollutLoad Function in SWMM5 🌧️🔍📊

The landuse_getCoPollutLoad function in SWMM5 is a specialized component for calculating the washoff mass added by co-pollutants. This function plays a significant role in the accurate assessment of pollutant washoff in urban runoff modeling. Here's a detailed breakdown of its functionality:

Function Prototype 📝

• Input:
  • p: Index of the primary pollutant.
  • washoff[]: Array containing the washoff rates for pollutants (measured in mass per second).
• Output: Returns the washoff mass contributed by the co-pollutant (measured in mass).
• Purpose: To determine the additional washoff mass contributed by a co-pollutant of a given primary pollutant.

Process Flow and Computation 🌐🧩

1. Co-Pollutant Check:

   • The function first checks if the primary pollutant p has an associated co-pollutant, identified by the index k.
   • The index k is retrieved from the Pollut[p].coPollut property.

2. Washoff Computation:

   • If a co-pollutant exists (k >= 0), the function calculates the additional washoff contributed by this co-pollutant.
   • The washoff contribution w is determined by multiplying the washoff rate of the co-pollutant (washoff[k]) by the co-pollutant fraction (Pollut[p].coFraction).

3. Mass Balance Update:

   • The function updates the mass balance totals for buildup loads to ensure consistency in the overall mass balance.
   • This update is done through the massbal_updateLoadingTotals function, which accounts for the mass contribution factor (Pollut[p].mcf) of the pollutant.

4. Return Value:

   • The computed additional washoff mass w is returned.
   • If no co-pollutant exists, the function returns 0.0, indicating no additional washoff from co-pollutants.

Role in SWMM5 🏙️💧

• Essential for modeling complex interactions between different pollutants in urban runoff.
• Helps in understanding how the presence of one pollutant can influence the washoff behavior of another, providing a more realistic representation of pollutant dynamics in urban water systems.

Implications for Urban Hydrology 🌳🚧

• This function is crucial for accurately assessing pollutant loads in stormwater runoff, particularly in areas with diverse pollutant sources.
• It aids in the formulation of effective stormwater management and treatment strategies, especially in environments with intricate pollutant interrelationships.

In conclusion, the landuse_getCoPollutLoad function in SWMM5 is pivotal in enhancing the precision of pollutant washoff modeling, reflecting the complex nature of urban runoff pollution. Its ability to account for co-pollutant interactions significantly improves the understanding and management of urban water quality. 🌧️📈🔍🌍💧🌆🚰🔬🌳📊🚧🏙️💧🔄📈🔬🌍💧🌆🚰🔬