Friday, November 10, 2023

Detailed Overview of landuse_getExternalBuildup Function in SWMM5 ๐ŸŒฟ๐Ÿ”๐Ÿ“Š

 

Detailed Overview of landuse_getExternalBuildup Function in SWMM5 ๐ŸŒฟ๐Ÿ”๐Ÿ“Š

The landuse_getExternalBuildup function in SWMM5 is designed to calculate pollutant buildup due to external loading over a specified time step. Here's a detailed breakdown of its functionality, with added explanations:

Function Prototype ๐Ÿ“

  • Input:
    • i: Landuse index.
    • p: Pollutant index.
    • buildup: Existing buildup at the start of the time step (measured in mass per unit area).
    • tStep: Time step duration in seconds.
  • Output: Returns the pollutant buildup at the end of the time interval (mass per unit area).
  • Purpose: To determine the increase in pollutant buildup due to external sources during a given time step.

Process Flow and Computation ๐ŸŒ๐Ÿงฉ

  1. Maximum Buildup Determination:

    • Retrieves the maximum allowable buildup (maxBuildup) for the specific land use and pollutant.
  2. Scaling Factor and Time Series Index:

    • sf (scaling factor): Modifies the rate of buildup based on specific land use characteristics.
    • ts (time series index): Points to the relevant time series data for buildup rates.
  3. Initial Condition Check:

    • At the start of the simulation (when NewRunoffTime is 0), the function immediately returns zero, indicating no buildup increment.
  4. Buildup Rate Calculation:

    • If a valid time series index (ts) is present, it fetches the buildup rate (in mass/unit/day) from the time series table (Tseries[ts]), scaling it with the scaling factor (sf).
  5. Buildup Computation:

    • Calculates the total buildup at the end of the time interval by adding the product of the rate and the time step (converted from seconds to days).
    • Ensures that the calculated buildup does not exceed the predefined maximum buildup (maxBuildup).
  6. Return Value:

    • The function returns the computed buildup value, which represents the accumulated pollutant mass per unit area at the end of the time step.

Function's Role in SWMM5 ๐ŸŒŽ๐Ÿšฐ

  • Integral to modeling the accumulation of pollutants on different land uses over time.
  • Helps in understanding the impact of external loading sources on urban runoff quality.
  • Crucial for designing and evaluating strategies to mitigate pollutant discharge into stormwater systems.

In summary, the landuse_getExternalBuildup function in SWMM5 is vital for accurately predicting pollutant buildup from external sources on various land uses, thereby aiding in the effective management of urban runoff and water quality. ๐ŸŒฟ๐Ÿ“ˆ๐Ÿ”ฌ๐ŸŒง️๐Ÿ™️๐Ÿ“Š๐Ÿงช๐Ÿ’ง๐Ÿ”„๐ŸŒ๐Ÿ“Š๐Ÿ”๐ŸŒ†

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