Appendix B - Visual Object Properties

X-Coordinate

Horizontal location of the rain gage on the Study Area Map. If left blank then the rain gage will not appear on the map.

Y-Coordinate

Vertical location of the rain gage on the Study Area Map. If left blank then the rain gage will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the rain gage.

Tag

Optional label used to categorize or classify the rain gage.

Rain Format

Format in which the rain data are supplied:

INTENSITY: each rainfall value is an average rate in inches/hour (or mm/hour) over the recording interval,

VOLUME: each rainfall value is the volume of rain that fell in the recording interval (in inches or millimeters),

CUMULATIVE: each rainfall value represents the cumulative rainfall that has occurred since the start of the last series of non-zero values (in inches or millimeters).

Rain Interval

Recording time interval between gage readings in either decimal hours or hours: minutes format.

Snow Catch Factor

Factor that corrects gage readings for snowfall.

Data Source

Source of rainfall data; either TIMESERIES for user-supplied time series data or FILE for an external data file.

TIME SERIES

 - Series Name

Name of time series with rainfall data if Data Source selection was TIMESERIES; leave blank otherwise (double-click to edit the series).

DATA FILE

- File Name

Name of external file containing rainfall data.

- Station No.

Recording gage station number.

- Rain Units

Depth units (IN or MM) for rainfall values in the file.

X-Coordinate

Horizontal location of the subcatchment's centroid on the Study Area Map. If left blank then the subcatchment will not appear on the map.

Y-Coordinate

Vertical location of the subcatchment's centroid on the Study Area Map. If left blank then the subcatchment will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the subcatchment.

Tag

Optional label used to categorize or classify the subcatchment.

Rain Gage

Name of the rain gage associated with the subcatchment.

Outlet

Name of the node or subcatchment which receives the subcatchment's runoff.

Area

Area of the subcatchment (acres or hectares).

Width

Characteristic width of the overland flow path for sheet flow runoff (feet or meters). An initial estimate of the characteristic width is given by the subcatchment area divided by the average maximum overland flow length. The maximum overland flow length is the length of the flow path from the the furthest drainage point of the subcatchment before the flow becomes channelized. Maximum lengths from several different possible flow paths should be averaged. These paths should reflect slow flow, such as over pervious surfaces, more than rapid flow over pavement, for example. Adjustments should be made to the width parameter to produce good fits to measured runoff hydrographs.

% Slope

Average percent slope of the subcatchment.

% Imperv

Percent of land area which is impervious.

N-Imperv

Manning's n for overland flow over the impervious portion of the subcatchment (see Section A.6 for typical values).

N-Perv

Manning's n for overland flow over the pervious portion of the subcatchment (see Section A.6 for typical values).

Dstore-Imperv

Depth of depression storage on the impervious portion of the subcatchment (inches or millimeters) (see Section A.5 for typical values).

Dstore-Perv

Depth of depression storage on the pervious portion of the subcatchment (inches or millimeters) (see Section A.5 for typical values).

% Zero-Imperv

Percent of the impervious area with no depression storage.

Subarea Routing

Choice of internal routing of runoff between pervious and impervious areas:

IMPERV: runoff from pervious area flows to impervious area,

PERV: runoff from impervious area flows to pervious area,

OUTLET: runoff from both areas flows directly to outlet.

Percent Routed

Percent of runoff routed between subareas.

Infiltration

Click the ellipsis button (or press Enter) to edit infiltration parameters for the subcatchment.

LID Controls

Click the ellipsis button (or press Enter) to edit the use of low impact development controls in the subcatchment.

Groundwater

Click the ellipsis button (or press Enter) to edit groundwater flow parameters for the subcatchment.

Snow Pack

Name of snow pack parameter set (if any) assigned to the subcatchment.

Land Uses

Click the ellipsis button (or press Enter) to assign land uses to the subcatchment.

Initial Buildup

Click the ellipsis button (or press Enter) to specify initial quantities of pollutant buildup over the subcatchment.

Curb Length

Total length of curbs in the subcatchment (any length units). Used only when pollutant buildup is normalized to curb length.

Cell Type

Type of cell geometry, i.e. Hexagonal

Roughness

Manning's roughness coefficient

Seepage

Rate of seepage loss into surrounding soil mm/hr or in/hr

Junc Name

Junction name assigned by 2D tool for the corresponding cell

Elevation

Invert elevation of the centroid junction

Cell Type

Type of cell geometry, i.e. Hexagonal

Area

Geometric Area of each cell

X-Coordinate

Horizontal location of the junction on the Study Area Map. If left blank then the junction will not appear on the map.

Y-Coordinate

Vertical location of the junction on the Study Area Map. If left blank then the junction will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the junction.

Tag

Optional label used to categorize or classify the junction.

Inflows

Click the ellipsis button (or press Enter) to assign external direct, dry weather or RDII inflows to the junction.

Treatment

Click the ellipsis button (or press Enter) to edit a set of treatment functions for pollutants entering the node.

Invert El.

Invert elevation of the junction (feet or meters).

Max. Depth

Maximum depth of junction (i.e., from ground surface to invert) (feet or meters). If zero, then the distance from the invert to the top of the highest connecting link will be used.

Initial Depth

Depth of water at the junction at the start of the simulation (feet or meters).

Surcharge Depth

Additional depth of water beyond the maximum depth that is allowed before the junction floods (feet or meters). This parameter can be used to simulate bolted manhole covers or force main connections.

Ponded Area

Area occupied by ponded water atop the junction after flooding occurs (sq. feet or sq. meters). If the Allow Ponding simulation option is turned on, a non-zero value of this parameter will allow ponded water to be stored and subsequently returned to the conveyance system when capacity exists.

*Active

Junctions in between 1D closed conduit will be active and junction which are in between open 1D conduits will be inactive. In quasi 2D model, open channel will be represented by 2D mesh hence junctions fall within the open channel will become inactive. Only active features will be used for calculation.

*1D-2D Connectivity

Indicate the junctions which are connected to 2D junction through any structure. If “Yes” it is connected , If “No” it is not connected.

X Coordinate

Horizontal location of the junction on the Study Area Map. If left blank then the junction will not appear on the map.

Y Coordinate

Vertical location of the junction on the Study Area Map. If left blank then the junction will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the junction.

Tag

Optional label used to categorize or classify the junction.

Invert Elevation

Invert elevation of the junction (feet or meters).

Maximum Depth

Maximum depth of junction (i.e., from ground surface to invert) (feet or meters). If zero, then the distance from the invert to the top of the highest connecting link will be used.

Initial Depth

Depth of water at the junction at the start of the simulation (feet or meters).

Surcharge Depth

Additional depth of water beyond the maximum depth that is allowed before the junction floods (feet or meters). This parameter can be used to simulate bolted manhole covers or force main connections.

Ponded area

Area occupied by ponded water atop the junction after flooding occurs (sq. feet or sq. meters). If the Allow Ponding simulation option is turned on, a non-zero value of this parameter will allow ponded water to be stored and subsequently returned to the conveyance system when capacity exists.

Elevation

Invert elevation of 2D nodes ( feet or meters)

Name

X-Coordinate

Horizontal location of the junction on the Study Area Map. If left blank then the outfall will not appear on the map.

Y-Coordinate

Vertical location of the Outfall on the Study Area Map. If left blank then the outfall will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the outfall.

Tag

Optional label used to categorize or classify the outfall.

Inflows

Click the ellipsis button (or press Enter) to assign external direct, dry weather or RDII inflows to the outfall.

Treatment

Click the ellipsis button (or press Enter) to edit a set of treatment functions for pollutants entering the node.

Invert El.

Invert elevation of the outfall (feet or meters).

Tide Gate

YES - tide gate present to prevent backflow

NO - no tide gate present

Type

Type of outfall boundary condition:

FREE: outfall stage determined by minimum of critical flow depth and normal flow depth in the connecting conduit

NORMAL: outfall stage based on normal flow depth in connecting conduit

FIXED: outfall stage set to a fixed value

TIDAL: outfall stage given by a table of tide elevation versus time of day

TIMESERIES: outfall stage supplied from a time series of elevations.

Fixed Stage

Water elevation for a FIXED type of outfall (feet or meters).

Tidal Curve

Name of the Tidal Curve relating water elevation to hour of the day for a TIDAL outfall (double-click to edit the curve).

Name

Name of time series containing time history of outfall elevations for a TIMESERIES outfall (double-click to edit the series).

X-Coordinate

Horizontal location of the divider on the Study Area Map. If left blank then the divider will not appear on the map.

Y-Coordinate

Vertical location of the divider on the Study Area Map. If left blank then the divider will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the divider.

Tag

Optional label used to categorize or classify the divider.

Inflows

Click the ellipsis button (or press Enter) to assign external direct, dry weather or RDII inflows to the divider.

Treatment

Click the ellipsis button (or press Enter) to edit a set of treatment functions for pollutants entering the node.

Invert El.

Invert elevation of the divider (feet or meters).

Max. Depth

Maximum depth of divider (i.e., from ground surface to invert) (feet or meters). If zero, then the distance from the invert to the top of the highest connecting link will be used.

Initial Depth

Depth of water at the divider at the start of the simulation (feet or meters).

Surcharge Depth

Additional depth of water beyond the maximum depth that is allowed before the junction floods (feet or meters). 

Ponded Area

Area occupied by ponded water atop the junction after flooding occurs (sq. feet or sq. meters). See description for Junctions.

Diverted Link

Name of link which receives the diverted flow.

Type

Type of flow divider. Choices are:

CUTOFF (diverts all inflow above a defined cutoff value),

OVERFLOW (diverts all inflow above the flow capacity of the non-diverted link),

TABULAR (uses a Diversion Curve to express diverted flow as a function of the total inflow),

WEIR (uses a weir equation to compute diverted flow).

CUTOFFDIVIDER

-Cutoff Flow

Cutoff flow value used for a CUTOFF divider (flow units).

TABULAR DIVIDER

Curve Name

Name of Diversion Curve used with a TABULAR divider (double-click to edit the curve).

WEIRDIVIDER

- Min. Flow

Minimum flow at which diversion begins for a WEIR divider (flow units).

- Max. Depth

Vertical height of WEIR opening (feet or meters)

 - Coefficient

Product of WEIR's discharge coefficient and its length. Weir coefficients are typically in the range of 2.65 to 3.10 per foot, for flows in CFS.

X-Coordinate

Horizontal location of the storage unit on the Study Area Map. If left blank then the storage unit will not appear on the map.

Y-Coordinate

Vertical location of the storage unit on the Study Area Map. If left blank then the storage unit will not appear on the map.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the storage unit.

Tag

Optional label used to categorize or classify the storage unit.

Inflows

Click the ellipsis button (or press Enter) to assign external direct, dry weather or RDII inflows to the storage unit.

Treatment

Click the ellipsis button (or press Enter) to edit a set of treatment functions for pollutants entering the node.

Invert El.

Invert elevation of the storage unit (feet or meters).

Max. Depth

Max. Depth of storage unit (i.e., from ground surface to invert) (feet or meters). If zero, then the distance from the invert to the top of the highest connecting link will be used.

Initial Depth

Depth of water at the storage unit at the start of the simulation (feet or meters).

Ponded Area

Surface area occupied by ponded water atop the storage unit once the water depth exceeds the maximum depth (sq. feet or sq. meters). See description for Junctions.

Evap. Factor

The fraction of the potential evaporation from the storage unit’s water surface that is actually realized.

Infiltration

Click the ellipsis button (or press Enter) to supply a set of Green- Ampt parameters that describe how water can infiltrate into the native soil below the unit. See Section C.7 for a description of these parameters, To disable any infiltration, make sure that these parameters are blank.

Storage Curve

Method of describing the geometric shape of the storage unit:

FUNCTIONAL uses the function

Area = A*(Depth)^B + C

to describe how surface area varies with depth;

TABULAR uses a tabulated area versus depth curve.

In either case, depth is measured in feet (or meters) and surface area in sq. feet (or sq. m).

FUNCTIONAL

- Coeff.

A-value in the functional relationship between surface area and storage depth.

- Exponent

B-value in the functional relationship between surface area and storage depth.

- Constant

C-value in the functional relationship between surface area and storage depth.

TABULAR

- Curve Name

Name of the Storage Curve containing the relationship between surface area and storage depth (double-click to edit the curve).

Inlet Node

Name of node on the inlet end of the conduit (which is normally the end at higher elevation).

Outlet Node

Name of node on the outlet end of the conduit (which is normally the end at lower elevation).

Description

Click the ellipsis button (or press Enter) to edit an optional description of the conduit.

Tag

Optional label used to categorize or classify the conduit.

Shape

Click the ellipsis button (or press Enter) to edit the geometric properties of the conduit's cross section.

Max. Depth

Maximum depth of the conduit's cross section (feet or meters).

Length

Conduit length (feet or meters).

Roughness

Manning's roughness coefficient (see Section A.7 for closed conduit values or Section A.8 for open channel values).

Inlet Offset

Depth or elevation of the conduit invert above the node invert at the upstream end of the conduit (feet or meters).

Outlet Offset

Depth or elevation of the conduit invert above the node invert at the downstream end of the conduit (feet or meters).

Initial Flow

Initial flow in the conduit (flow units).

Maximum Flow

Maximum flow allowed in the conduit (flow units) – use 0 or leave blank if not applicable.

Entry Loss Coeff.

Head loss coefficient associated with energy losses at the entrance of the conduit. For culverts, refer to Table A11.

Exit Loss Coeff.

Head loss coefficient associated with energy losses at the exit of the conduit. For culverts, use a value of 1.0.

Avg. Loss Coeff.

Head loss coefficient associated with energy losses along the length of the conduit.

Flap Gate

YES if a flap gate exists that prevents backflow through the conduit, or NO if no flap gate exists.

 Culvert Code

Code number of inlet geometry if conduit is a culvert – leave blank otherwise. Culvert code numbers are listed in Table A10.

Active

Conduits having cross sections like ‘Rec_Open’, ‘Trapezoidal’, ‘Triangular’, ‘Parabolic’, ‘Power’, ’Irregular’ will be inactive in the 2D model, other conduits will remain active. Only active features will be used for calculation.

Inlet Node

Name of node on the inlet end of the pump (which is normally the end at higher elevation).

Outlet Node

Name of node on the outlet end of the pump (which is normally the end at lower elevation).

Description

Click the ellipsis button (or press Enter) to edit an optional description of the pump.

Tag

Optional label used to categorize or classify the pump.

Pump Curve

Name of the Pump Curve which contains the pump's operating data (double-click to edit the curve). Use * for an Ideal pump.

Initial Status

Status of the pump (ON or OFF) at the start of the simulation.

Startup Depth

Depth at inlet node when pump turns on (feet or meters).

Shutoff Depth

Depth at inlet node when pump shuts off (feet or meters).

Inlet Node

Name of node on the inlet end of the orifice (which is normally the end at higher elevation).

Outlet Node

Name of node on the outlet end of the orifice (which is normally the end at lower elevation).

Description

Click the ellipsis button (or press Enter) to edit an optional description of the orifice.

Tag

Optional label used to categorize or classify the orifice.

Type

Type of orifice (SIDE or BOTTOM).

Shape

Orifice shape (CIRCULAR or RECT_CLOSED).

Height

Height of orifice opening when fully opens (feet or meters).Corresponds to the diameter of a circular orifice or the height of a rectangular orifice.

Width

Width of rectangular orifice when fully opened (feet or meters).

Inlet Offset

Depth or elevation of bottom of orifice above invert of inlet node (feet or meters – see note below table of Conduit Properties).

Discharge Coeff.

Discharge coefficient (unitless). A typical value is 0.65.

Flap Gate

YES if a flap gate exists this prevents backflow through the orifice or NO if no flap gate exists.

Time to Open /

Close

The time it takes to open a closed (or close an open) gated orifice in decimal hours. Use 0 or leave blank if timed openings/closings do not apply. Use Control Rules to adjust gate position.

Inlet Node

Name of node on the inlet end of the weir (which is normally the end at higher elevation).

Outlet Node

Name of node on the outlet end of the weir (which is normally the end at lower elevation).

Description

Click the ellipsis button (or press Enter) to edit an optional description of the weir.

Tag

Optional label used to categorize or classify the weir.

Type

Weir type: TRANSVERSE, SIDEFLOW, V-NOTCH, or TRAPEZOIDAL.

Height

Vertical height of weir opening (feet or meters).

Length

Horizontal length of weir opening (feet or meters).

Side Slope

Slope (width-to-height) of side walls for a V-NOTCH or TRAPEZOIDAL weir.

Inlet Offset

Depth or elevation of bottom of weir opening from invert of inlet node (feet or meters – see note below table of Conduit Properties).

Discharge Coeff.

Discharge coefficient for flow through the central portion of the weir (for flow in CFS when using US units or CMS when using SI units). Typical values are: 3.33 US (1.84 SI) for sharp crested transverse weirs, 2.5 - 3.3 US (1.38 - 1.83 SI) for broad crested

rectangular weirs, 2.4 - 2.8 US (1.35 - 1.55 SI) for V-notch (triangular) weirs

 Flap Gate

YES if the weir has a flap gate that prevents backflow, NO if it does not.

End Coeff.

Discharge coefficient for flow through the triangular ends of a TRAPEZOIDAL weir. See the recommended values for V-notch weirs listed above.

End Contractions   

Number of end contractions for a TRANSVERSE or TRAPEZOIDAL weir whose length is shorter than the channel it is placed in. Values will be 0, 1, or 2 depending on if no ends, one end, or both ends are beveled in from the side walls.

Inlet Node

Name of node on inflow side of outlet.

Outlet Node

Name of node on discharge side of outlet.

Description

Click the ellipsis button (or press Enter) to edit an optional description of the outlet.

Tag

Optional label used to categorize or classify the outlet.

Inlet Offset

Depth or elevation of outlet above inlet node invert (feet or meters – see note below table of Conduit Properties).

Flap Gate

YES if a flap gate exists this prevents backflow through the outlet or NO if no flap gate exists.

Rating Curve

Method of defining flow (Q) as a function of depth or head (y) across the outlet.

FUNCTIONAL/DEPTH uses a power function (Q = Ay^B) to describe this relation where y is the depth of water above the outlet’s opening at the inlet node.

FUNCTIONAL/HEAD uses the same power function except that y is the difference in head across the outlet’s nodes.

TABULAR/DEPTH uses a tabulated curve of flow versus depth of water above the outlet’s opening at the inlet node.

TABULAR/HEAD uses a tabulated curve of flow versus difference in head across the outlet’s nodes.

FUNCTIONAL

- Coefficient

Coefficient (A) for the functional relationship between depth or head and flow rate.

- Exponent

Exponent (B) used for the functional relationship between depth or head and flow rate.

TABULAR

- Curve Name

Name of Rating Curve containing the relationship between depths or head and flow rate (double-click to edit the curve).