Free WSPG 2010


WSPG 2010 by XP Solutions is provided free of charge and is not covered by xpertcare (technical support and scheduled product updates). To assist with those who may have questions, this FAQ was created to share user questions and comments.

Branched Networks

Question: Can I join a branch to an existing network to analyze the larger system?

Answer: With the latest updates to WSPG by XP Solutions you can model a branched network in a single model.

Differences Between WSPG 2010 and Previous Build

Question: What’s the difference between WSPG 2010 and the WSPGw Program I’ve been using?

Answer: WSPG 2010 provides a graphical user interface to “build” the model. In the previous version, input was done with “cards” — more of a data entry kind of input. The new program has an interface with a geographical plan view perspective. With this you can input network elements with Windows features such as clicking and dragging to create reaches.

xpwspg vs. Other Similar Programs?

Question: What would be the benefit of xpwspg versus WMS or HEC-RAS?

Answer: Keep in mind that XP Solutions now provides two programs that include WSPG hydraulics: xpwspg, which is XP Solutions's proprietary program and available for purchase, and WSPG 2010, the free public version. WSPG 2010 computes the hydraulic profile gradient per the LA County Public Works criteria.

vs Watershed Modeling System (WMS):

The xpwspg program includes both ModRAT Hydrology and WSPG Hydraulics in one program for modeling of Los Angeles County systems and those in surrounding areas. WSPG is not included in WMS.

The xpwspg add-on module provides direct simulation of hydrology in xpswmm with full dynamic wave routing.

xpwspg allows Water Quality concentrations and computations of loads with ModRAT then route pollutants in the network. It also does Pollutant removal simulations.

With xpwspg you can model LID using physically based SWMM hydrology.

The xpswmm portion of xpswmm with the xpwspg module is FEMA approved.

xpwspg has a link-node based interface.


With xpwspg in xpswmm you can compute hydrology including ModRAT or 15 other methods in event or continuous simulations.

xpwspg in xpswmm allows Water Quality simulations of buildup and washoff including pollutant removal options.

Both WSPG 2010 and xpwspg provide WSPG hydraulics option with new multiple branch feature.

xpwspg in xpswmm allows modeling of mixed open and closed conduits such as those found in interior drainage behind levees.

xpwspg in xpswmm includes Scenario Management and comparisons of multiple return period runs.

Data Input: Is a Text File Necessary?

Question: How is network data input to create a model? Is a text file still necessary?

Answer: Data relating to each element in a network is input through the GUI. Editing text input files is no longer necessary. Each wspg 2010 and xpwspg element type has a data input dialogue that not only allows easy data entry but decreases the amount of time it takes to setup a new model or revise an existing model.

Digitizing My Network

Question: Should I start digitizing my network at the upstream or downstream end?

Answer: Now that WSPG is in a graphical setting, the drainage system network coordinates correspond to real-world or project coordinate geometry. To indicate the intended direction of flow for the drainage system, the System Headworks (SH) must be the starting point of the system -- that is, the upstream most point in the system. As the system is digitized the direction of flow is indicated on each link.

Stationing Elements

Question: How is stationing input in WSPG 2010?

Answer: The WSPG 2010 graphical user interface is based on x,y coordinates. As the length of each element is input, the program calculates the stationing automatically. The only station that has to be input by the user is at the System Outfall (SO). In fact, the user can’t change the stationing of elements, except the System Outfall. The stationing of the SO can be changed after the system is digitized. The program recalculates all stationing (automatically) based on the user input lengths of each element.

Importing WSPG-w Files

Question: Can an older WSPG file with the extension .WSW be imported as an input file in the WSPG 2010?

Answer: Yes, under the Tools menu there is an option to import a WSPG or WSPG-W model. The WSPG-W software created the .wsw file type. One inflow at each system headworks is required. WSPG 2010 will only compute a single inflow at each system headworks. Note that multiple inflows will not be imported.

Color Coding Elements

Question: Is the color coding of links/nodes available in the WSPG 2010?

Answer: Color coding of links and/or nodes is only available in xpwspg or the xpswmm/xpstorm WSPG add-on module. Referred to as Graphical Encoding, this allows the user to represent different elements of a network by color.

Profile Plot

Question: Is the profile plot available in WSPG 2010?

Answer: The profile plot options are available only in xpwspg and the xpswmm/xpstorm xpwspg add-on module.

Addition of Flows at Junctions

Question: Is there an ability to override the simple addition of flows at junctions to account for peak flow reduction due to differences in Tc?

Answer: The nature of the steady calculations performed in WSPG 2010 does not reduce flows downstream due to differences in time of concentration. User input peak flows are added at the System Headworks, thus WSPG 2010 is not calculating time of concentration. A possible workaround might be to enter a negative flow at a junction, thus reducing the total flow downstream.

Automatic population of peak flows at System Headworks

Question: Can WSPG 2010 populate peak flows at System Headworks elements?

Answer: Through using the xpwspg or the xpswmm/xpstorm xpwspg add-on module, the user can automatically populate the peak flows at System Headworks elements. Upon generating LA County’s hydrology models in xpswmm/xpstorm, the peak flows can then been imported directly to the WSPG model. Peak flows from Runoff are automatically assigned to system headworks in xpwspg. The hydraulics peak flows in links could be assigned using xptables to WSPG headwork nodes.

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