VOSWMM

Chamber

OTTHYMO object VOSWMM object
Chamber
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 Chamber. The first Pump and the followed Outfall are used to model the infiltration from the Chamber. 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 Chamber has Underdrain modeled, another Pump is added to model the Underdrain. If the Chamber 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 settings and make adjustment if needed.
  • Chamber does not have Underdrain or Outflow
  • Chamber has Underdrain
  • Chamber has Outflow
  • Chamber has Underdrain and Outflow

The parameters of VOSWMM Storage Unit are assigned as:

  • NHYD = Chamber NHYD
  • Name = Chamber Name
  • Full Depth = the last cell in Depth column of Chamber Depth-Storage curve / unitConversion, where unitConversion is 1000 if OTTHYMO scenario is in metric unit and 12 if OTTHYMO scenario is in imperial unit)
  • Initial Depth = Chamber Initial Water Level
  • Storage Curve = Tabular
  • Storage Curve Table (note: unitConversion is 1000 if OTTHYMO scenario is in metric unit and 12 if OTTHYMO scenario is in imperial unit)
    Depth Area
    0 (Chamber.DepthStorageCurve.Storage(2) – Chamber.DepthStorageCurve.Storage(1)) / (Chamber.DepthStorageCurve.Depth(2) – Chamber.DepthStorageCurve.Depth(1))
    Chamber.DepthStorageCurve.Depth(2) / conversionValue (Chamber.DepthStorageCurve.Storage(2) – Chamber.DepthStorageCurve.Storage(1)) / (Chamber.DepthStorageCurve.Depth(2) – Chamber.DepthStorageCurve.Depth(1)) x unitConversion
    … …
    Chamber.DepthStorageCurve.Depth(n-1) / conversionValue (Chamber.DepthStorageCurve.Storage(n) – Chamber.DepthStorageCurve.Storage(n-1)) / (Chamber.DepthStorageCurve.Depth(n) – Chamber.DepthStorageCurve.Depth(n-1)) x unitConversion
    Chamber.DepthStorageCurve.Depth(n) / conversionValue (Chamber.DepthStorageCurve.Storage(n) – Chamber.DepthStorageCurve.Storage(n-1)) / (Chamber.DepthStorageCurve.Depth(n) – Chamber.DepthStorageCurve.Depth(n-1)) x unitConversion

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

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

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

  • NHYD: Chamber-NHYD[x]-Outflow, where x is the NHYD of the Chamber
  • Name: Chamber-NHYD[x]-Outflow, where x is the NHYD of the Chamber
  • 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