VOSWMM

Rain Garden

OTTHYMO object VOSWMM object
Rain Garden
Storage Unit with a Pump followed by an Outfall, and a Weir. The Storage Unit is used to model the main structure of Rain Garden. The Pump and the followed Outfall are is used to model the infiltration and evapotranspiration from the Rain Garden. 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.

The parameters of VOSWMM Storage Unit are assigned as:

  • NHYD = Rain Garden NHYD
  • Name = Rain Garden Name
  • Full Depth = RainGarden.SurfacePondingLayer.DepthAreaCurve.lastCellOfStageColumn + RainGarden.EngineeringSoilLayer.Depth
  • Storage Curve = Tabular
  • Storage Table Curve
    Depth Area
    0 RainGarden.EngineeringSoilLayer.Width x RainGarden.EngineeringSoilLayer.Length x RainGarden.EngineeringSoilLayer.TotalPorosity
    RainGarden.EngineeringSoilLayer.Depth RainGarden.EngineeringSoilLayer.Width x RainGarden.EngineeringSoilLayer.Length x RainGarden.EngineeringSoilLayer.TotalPorosity
    RainGarden. EngineeringSoilLayer.Depth RainGarden.SurfacePondingLayer.DepthAreaCurve.Area(1)
    RainGarden.SurfacePondingLayer.DepthAreaCurve.Stage(2)
    + RainGarden. EngineeringSoilLayer.Depth     		RainGarden.SurfacePondingLayer.DepthAreaCurve.Area(2)
    … …
    RainGarden.SurfacePondingLayer.DepthAreaCurve.Stage(n)
    + RainGarden. EngineeringSoilLayer.Depth     		RainGarden.SurfacePondingLayer.DepthAreaCurve.Area(n)

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

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