VOSWMM

Green Roof

OTTHYMO object VOSWMM object
GreenRoof
Storage Unit with a Pump followed by an Outfall, a Weir and another Pump. The Storage Unit is used to model the main structure of Chamber. The first Pump and the followed Outfall are used to model the evapotranspiration from the Green Roof. 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 second Pump is used to model the Underdrain.

The parameters of VOSWMM Storage Unit are assigned as:

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

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

  • NHYD = GreenRoof-NHYD[x]-ET, where x is the NHYD of the Green Roof
  • Name = GreenRoof-NHYD[x]-ET, where x is the NHYD of the Green Roof
  • 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 = GreenRoof-NHYD[x]-ET, where x is the NHYD of the Green Roof
  • Other parameters keep as default as in VOSWMM.

The parameters of VOSWMM Outfall used for evapotranspiration:

  • Use the default values as in VOSWMM.

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

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