#INFOSWMM

Conduit Hydraulic (Modeling) – Data Table in InfoSWMM

Conduit Hydraulic (Modeling) – Data Table in InfoSWMM

Some conduit hydraulic data is contained in this database table. The following table is in invert colors and shows the whole first row of the DB Table on separate rows in the image.

Field Description
Conduit ID User-assigned conduit name. It can only be changed with the Change ID command.
LENGTH Conduit length (feet or meters).
MANNING Manning’s n roughness coefficient. For typical values, click on closed for closed conduits and click on open for open Channels.
UP_DATA Height of the conduit invert above (offset) the node invert at the inlet end of the conduit (feet or meters).
DN_DATA Height of the conduit invert above (offset) the node invert at the outlet end of the conduit (feet or meters).
INIT_FLOW Initial flow in the conduit at the start of the simulation (flow units).
ENTRY_LOSS Head loss coefficient associated with energy losses at the entrance of the conduit.
EXIT_LOSS Head loss coefficient associated with energy losses at the exit of the conduit.
AVG_LOSS Head loss coefficient associated with energy losses along the length of the conduit.
FLAP_GATE YES if a flap gate exists which prevents backflow through the conduit, or NO if no flap gate exists.
SHAPE_TYPE Geometric shape of the conduit. This could also be selected using the cross-section Editor. Depending on the Shape of the conduit, an appropriate set of edit fields appears for describing the dimensions of that shape. Length dimensions are in units of feet for US units and meters for SI units. Slope values are represented by change in elevation divided by length.
GEOM1 Maximum depth of the conduit’s cross section (feet or meters). This length dimension appears for all conduit shapes, except for Irregular and Dummy shapes. (e.g. diameter)
GEOM2 The exact implication varies with channel shape, but in most cases, it refers to channel width parameter.
GEOM3 An auxiliary channel parameter ( e.g. side slope)
GEOM4 An auxiliary channel parameter ( e.g. side slope)
BARREL_CNT Number of identical parallel conduits that exist between the Start Node and the End Node. Default is 1.0.
TRANSECT Name of transect. This field is activated only if Irregular is selected for conduit shape. Double click field in Attribute Editor to edit a transect.
MAX_FLOW The maximum flow rate allowed to pass through a conduit, regardless of the calculated value.
SHP_CURVE This field is enabled in Attribute Editor if Shape_Type = 23:Custom. Curve is entered using the Curve Editor invoked through the Operation Tab in the Attribute Browser or by double-clicking on the field name .
FORCE_MAIN Yes if conduit is a force main and No if it is not
ROUGHNESS Force main conduit roughness. Manning’s n or Darcy-Weisbach depending on which option is chosen in Dynamic Wave Options
Culvert Code For simulations using the Dynamic Wave Routing Model, flow through culverts may be reduced if they are under inlet-control conditions. Double-click the field label to launch a dialog box to assist you in selecting the appropriate code. See Inlet Control for Culverts and Culvert Code Numbers for more information.
Vertical Roughness Threshold The Vertical Roughness Threshold is a fraction and the Threshold depth calculated from this fraction will be the Vertical Roughness Threshold Fraction * Maximum depth. If the Maximum depth is 3 meters and the Vertical Roughness Threshold is 0.5 then the dividing depth is 1.5 meter
Vertical Roughness The lower or higher link roughness is entered as the Vertical Roughness value
Seepage Loss Rate Rate of Seepage Loss into surrounding Soil (in/hr) or (mm/hr)

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