VOSWMM

Soakaway Pit

OTTHYMO object VOSWMM object
Soakaway Pit
Storage Unit with a Pump followed by an Outfall, a Weir and if applicable another Pump. The Storage Unit is used to model the main structure of Soakaway Pit. The first Pump and the followed Outfall are used to model the infiltration from the Soakaway Pit. 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 Soakaway Pit has Underdrain modeled, another Pump is added to model the Underdrain.
  • Soakaway Pit does not have Underdrain
  • Soakaway Pit has Underdrain

The parameters of VOSWMM Storage Unit are assigned as:

  • NHYD = Soakaway Pit NHYD
  • Name = Soakaway Pit Name
  • Full Depth = Soakaway Pit Height
  • Initial Depth = Soakaway Pit Initial Water Level
  • Storage Curve = Functional
  • Storage Functional Curve
    • Coefficient = 0
    • Constant = Soakaway Pit Width x Length x Porosity
  • Other parameters keep as default as in VOSWMM.

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

  • NHYD = SoakawayPit-NHYD[x]-Infil, where x is the NHYD of the Soakaway Pit
  • Name = SoakawayPit-NHYD[x]-Infil, where x is the NHYD of the Soakaway Pit
  • 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 = SoakawayPit-NHYD[x]-Infil, where x is the NHYD of the Soakaway Pit
  • Other parameters keep as default as in VOSWMM.

The parameters of VOSWMM Outfall used for infiltration:

  • Use the default values as in VOSWMM.

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

  • NHYD: SoakawayPit-NHYD[x]-Overflow, where x is the NHYD of the Soakaway Pit
  • Name: SoakawayPit-NHYD[x]-Overflow, where x is the NHYD of the Soakaway Pit
  • 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: SoakawayPit-NHYD[x]-Underdrain, where x is the NHYD of the Soakaway Pit
  • Name: SoakawayPit-NHYD[x]-Underdrain, where x is the NHYD of the Soakaway Pit
  • Pump curve
    • Curve type = TYPE4
    • Curve name = SoakawayPit-NHYD[x]-Underdrain, where x is the NHYD of the Soakaway Pit
    • Curve Table = Soakway Pit Underdrain Discharge Curve