SWMM - Links - Conduit

Conduits are pipes or channels that move water from one node to another in the transportation system. Its cross-sectional shapes can be selected from a variety of standard open and closed geometries. Natural cross-section Irregular shapes are also supported, as are user-defined closed shapes.

In order for SWMM to recognize a conduit, the Constructor linear device, must contain an activity conduit:

SWMM conduits have, in addition to the properties of Links, the following properties:

• Head Losses
  • Entry Loss - Head loss coefficient associated with energy losses at the conduit entrance (typical values)
  • Seepage Loss - Optional soil properties that determine seepage loss through the bottom and sloped sides of the storage unit
  • Output Loss - Head loss coefficient associated with energy losses at the conduit outlet.
    For manholes, use a value of 1
  • Average Loss - Head loss coefficient associated with energy losses along the length of the conduit
• SWMM
  • Manhole Code - Inlet geometry code number if the conduit is a manhole subject to possible inlet flow control, leave blank otherwise. See the Manhole Code Number Table
    Conduits designated as culverts are continuously checked during dynamic wave flow routing to see that they operate under input control, as defined in the Federal Highway Administration publication Manhole Hydraulic Project (Publication No. FHWA-NHI-01-020, May 2005)
  • Retention Device - True, if there is a gate that prevents back flow, NOT otherwise
  • Inlet Elevation - Elevation of the lower inner generatrix of the conduit
    This is a property that depends on the geometry of the conduit, so it must be tied to its starting point, for example: In this example, it is a circular pipe, where the property Ponto Inicial (StartPoint) is located at the center of the circle, thus, discount the value of the radius that is valid here:
    
    Input Elevation = StartPoint.Z - Height / 2
    Where:
    Height - is the diameter of the section
    StartPoint is the starting point of the axis that defines the conduit
  • Outlet Elevation - Elevation of the inverted conduit at the outlet end of the conduit
    The same considerations made for input elevation apply now:
    
    Output Elevation = EndPoint.Z - Height / 2
    Where:
    Height - is the diameter of the section
    EndPoint is the endpoint of the axis that defines the conduit
• Flow
  • Initial Flow - Initial flow in the conduit at the start of the simulation
  • Maximum Flow - Maximum flow allowed in the conduit
    Use 0 if not applicable
• Cross section
  • Hydraulic Section - Pre-set geometry of hydraulic section
    SWMM implements a number of predefined sections:

    Circular Forced Main Circular Filled Rectangular Closed Rectangular Open Trapezoidal Triangular Horizontal Ellipse Vertical Ellipse

    Arched Gallery Parabolic Power Triangular Rect Round Rect Modified Basket Handle Oval Horseshoe

    Gothic Catenary Semi Elliptical Basket Handle Semi Circular Custom Irregular Dummy

To view the properties of a conduit in SOLIDOS, use the tab Properties or use the command SPROPS:

Note: You must click the at the top of the screen.

If it is not visible, it means that the network is not enabled for SWMM. Enable it in your properties: