#INFOSWMM

Weir Editor in InfoSWMM and InfoSWMM SA for a SWMM5 Weir


Weir Editor in InfoSWMM and InfoSWMM SA for a SWMM5 Weir

Like all other visual data objects, Weir object is edited using the attribute browser.

To edit attributes of a weir:

  • Switch the map to Object Selection mode by clicking from InfoSWMM Edit Network tool bar.
  • Select the weir whose attributes are to be edited by clicking the mouse on the weir. This process will initiate the attribute browser given below. Description of each of these attributes is also presented below.
  • In addition to the parameters listed in the attribute browser, weirs may also require definition of Initial Status and Control. Attribute editor of these weir operation rules could be initiated by selecting the Initial Status button and the Control button or by clicking on the icon located at the second row of the top of the attribute browser, and then clicking on the desired feature from the initiated pop up menu.

(ID) – User-assigned weir name.

Description – Optional description of the weir.

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

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

Weir Type – Weir type. Available options are:

  • TRANSVERSE- Rectangular in shape and placed transverse to flow direction.
  • SIDEFLOW – Rectangular in shape and placed along flow direction.
  • V-NOTCH – Triangular in shape.
  • TRAPEZOIDAL – Trapezoidal in shape.

Height – Vertical height of weir opening (feet or meters).

Weir Length – Horizontal length of weir opening (feet or meters).

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

Weir Crest Height – Height of bottom of weir opening from invert of inlet node (feet or meters).

Coefficient of Discharge – 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

Weir with Flap GateYES if the weir has a flap gate that prevents backflow, NO if it does not.

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

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

Open Top – Yes or No for a Weir in InfoSWMM

If Open Top is NO then the weir can surcharge and flow can increase in the weir until the upstream node is flooded. This is the same as a Can Surcharge of YES in EPA SWMM 5.1+

If Open Top is YES then the weir does not surcharge and flow does not increase in the weir when the weir is full. This is the same as a Can Surcharge of NO in EPA SWMM 5.1+

Can Surcharge YES if the weir can surcharge (have an upstream water level higher than the height of the opening) or NO if it cannot.

ROADWAY WEIR
Road Width
Width of roadway and shoulders (feet or meters)

Road Surface

Type of road surface: PAVED or GRAVEL.

Initial Status – Helps to specify the Setting of the weir at the simulation start time. Click the button to initiate the Initial Status editor.

Control – Helps to supply simple weir operational control rule. Click the button to initiate the Simple Control Rule. In addition, a more sophisticated Real-Time Control Rule for operational control of weir could be formulated using the Real-Time Control Rule editor.

Tag – Optional label used to identify or categorize the weir.

Installation Year – Optional. The year the weir is installed.

Retirement Year – Optional. The year the weir will be retiring.

Zone – Optional zone to which the weir belongs.

Phase – Optional phase of the project.

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