VOSWMM

Bioretention

OTTHYMO object VOSWMM object
Bioretention
Storage Unit with a Pump followed by an Outfall, a Weir and if applicable another Pump and a Conduit. The Storage Unit is used to model the main structure of Bioretention. The first Pump and the followed Outfall are used to model the infiltration and evapotranspiration from the Bioretention. The Weir is used to model the Overflow. The Type of the Weir is Transverse and the Height and Width of Weir use the default value 1 as in VOSWMM. Users should check these settings and make adjustment if needed. If the Bioretention has Underdrain modeled, another Pump is added to model the Underdrain. If the Bioretention has Outflow modeled, a circular Conduit with a diameter of 1 and a length of 50 is added to model the Outflow. Users should check these values and make adjustment if needed.
  • Bioretention does not have Underdrain or Outflow
  • Bioretention has Underdrain
  • Bioretention has Outflow
  • Bioretention has Underdrain and Outflow

The parameters of VOSWMM Storage Unit are assigned as:

  • NHYD = Bioretention NHYD
  • Name = Bioretention Name
  • Full Depth = Bioretention.SurfacePondingLayer.DepthAreaCurve.lastCellOfStageColumn + Bioretention.MulchLayer.Depth + Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height
  • Storage Curve = Tabular
  • Storage Curve Table
    Depth Area
    0 Bioretention.EngineeringSoilLayer.Width x Bioretention.EngineeringSoilLayer.Length x Bioretention.StorageLayer.Porosity
    Bioretention.StorageLayer.Height Bioretention.EngineeringSoilLayer.Width x Bioretention.EngineeringSoilLayer.Length x Bioretention.StorageLayer.Porosity
    Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height Bioretention.EngineeringSoilLayer.Width x Bioretention.EngineeringSoilLayer.Length x Bioretention.EngineeringSoilLayer.TotalPorosity
    Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height Bioretention.SurfacePondingLayer.DepthAreCurve.firstCellOfAreaColumn x Bioretention.MulchLayer.Porosity
    Bioretention.MulchLayer.Depth + Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height Bioretention.SurfacePondingLayer.DepthAreCurve.firstCellOfAreaColumn x Bioretention.MulchLayer.Porosity
    Bioretention.MulchLayer.Depth + Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height Bioretention.SurfacePondingLayer.DepthAreaCurve.Area(1)
    Bioretention.SurfacePondingLayer.DepthAreaCurve.Stage(2)
    + Bioretention.MulchLayer.Depth + Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height     		Bioretention.SurfacePondingLayer.DepthAreaCurve.Area(2)
    … …
    Bioretention.SurfacePondingLayer.DepthAreaCurve.Stage(n)+ Bioretention.MulchLayer.Depth + Bioretention.EngineeringSoilLayer.Depth + Bioretention.StorageLayer.Height Bioretention.SurfacePondingLayer.DepthAreaCurve.Area(n)

The parameters of VOSWMM Pump used for infiltration and evapotranspiration are assigned as:

  • NHYD = Bioretention-NHYD[x]-Infil, where x is the NHYD of the Bioretention
  • Name = Bioretention-NHYD[x]-Infil, where x is the NHYD of the Bioretention
  • Pump curve
    The same method as infiltration and evapotranspiration modeling of Wetland Conversion will be used to define the curve table, time-series data and control rule.
    • Curve type = TYPE4
    • Curve Name = Bioretention-NHYD[x]-Infil, where x is the NHYD of the Bioretention
  • Other parameters keep as default as in VOSWMM.

The parameters of VOSWMM Outfall used for infiltration and evapotranspiration:

  • Use the default values as in VOSWMM.

The parameters of VOSWMM Weir used for overflow are assigned as:

  • NHYD: Bioretention-NHYD[x]-Overflow, where x is the NHYD of the Bioretention
  • Name: Bioretention-NHYD[x]-Overflow, where x is the NHYD of the Bioretention
  • Type = Transverse
  • Flap Gate = Yes
  • Can Surcharge = Yes
  • Other parameters keep as default as in VOSWMM.

The parameters of VOSWMM Pump used for underdrain, if applicable, are assigned as:

  • NHYD: Bioretention-NHYD[x]-Underdrain, where x is the NHYD of the Bioretention
  • Name: Bioretention-NHYD[x]-Underdrain, where x is the NHYD of the Bioretention
  • Pump curve
    • Curve type = TYPE4
    • Curve name = Bioretention-NHYD[x]-Underdrain, where x is the NHYD of the Bioretention
    • Curve Table = Bioretention Underdrain Discharge Curve

The parameters of VOSWMM Conduit used for outflow, if applicable, are assigned as:

  • NHYD: Bioretention-NHYD[x]-Outflow, where x is the NHYD of the Bioretention
  • Name: Bioretention-NHYD[x]-Outflow, where x is the NHYD of the Bioretention
  • Shape = Circular
  • Shape Full Depth= 1. Users should check this value and make adjustment if needed. Conduit Full Depth and Geom1 will be updated automatically in VOSWMM.
  • Length = 50. Users should check this value and make adjustment if needed.
  • Flap Gate = Yes