W2 Post Quick Guide (Rev03)

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Quick Guide for the
CE-QUAL-W2 Post Processor
July 2012 Updates June 2016
A post-processor for CE-QUAL-W2 Version3/4 that provides the user with a broad range of visualization and
analyses of the model results. W2_Post provides for rapid visualization and assessment of W2 model results.
W2_Post uses a binary file generated by the CE-QUAL-W2 (i.e. the “W2L” file extension) for all of its model data
analysis. No need to output multiple types of output from W2. The post-processor provides extensive model
calibration / measured data comparison tools and statistics. The following are summaries of each major type of
post-processing available.
1) Model Grid Visualizations
a) Plan View
i) Normal View (i.e. using model input angles and widths)
ii) Simple View (simplified block view of grid)
iii) Line View
b) Longitudinal Profiles by Branch
c) Segment Profiles
d) Cells colored by connection and type
e) Google Earth KML, metafile and bitmap outputs
2) Animations
a) Animations time interpolate model stored results (in the W2L file) to user specified interval to speed
up/slow down animations.
b) Compare up to four separate model runs within a single animation. Mix and match parameters.
c) Up to four parameters from a single run can be animated.
d) User control of min/max color ranges.
e) User control of axis formats and types (i.e. segment/layer labels or distance/elevation units)
3) Vertical Profiles
a) View profile of any segment at any time (@ W2L intervals) for any parameter.
b) Automatic comparison of model and measured data with various statistics.
c) Various output formats.
4) Contours
a) View any branch longitudinal profile for any constituent.
b) Rapidly scroll through time.
c) Color filled and/or line contours.
d) Branch/Longitudinal Profile calibration statistics.
e) Various output formats.
5) Time Series
a) Point and click interface to select cells to plot.
b) Get a time series of any cell (if inundated) for any parameters for all or some of the modeled times.
c) Wide range of graph formatting options.

d) Various output options.
6) Velocity Vectors
a) View 2D velocity patters for any branch/longitudinal profile.
b) Rapidly scroll through time.
c) Various arrows formatting options.
d) Various output formats.
7) 2D Plan View
a) View 2D plan view concentrations at:
i) A specified layer
ii) Top active layer for each segment
iii) Volume weighted average for each segment
b) Rapidly scroll through time.
c) Use real world coordinates
d) If the model is using UTM, then Google Earth KML export option is available

W2_Tool/W2_Post Specific Files
The “W2P” file is the extension used by the W2_Tool utilities to define and retain non-model specific
information and user interface settings. This file is optional for W2_Post, however, it is strongly recommended to
save your project and use it for loading your projects.
A binary file that W2 creates during the model run. The W2L file contains all of the data necessary to
post-process the model results. However, it does not contain the scales and formatting that, once set, streamlines
the post-processing.

Setting up the W2_Post Linkage

Run the W2Control preprocessor for W2.


Turn on the W2_Post Linkage and define the snapshot timing.


Define the W2L file name


Save the model, then
Run the Model

Run W2_Post

The default W2_Post executable file name: W2Tool_Post3.exe


The W2_Post main form:

Degray Reservoir Example

Roosevelt Reservoir Example

Grid – Plan View – Block View

Grid – Plan View – Normal View

Grid – Plan View – Normal View with Labeling

Grid – Longitudinal Profile

2D Velocity Vectors

Longitudinal Profile - Contours

Animate – Two Parameters, Same Branch

1) Open the W2L file desired
a) Each “File” tab on the W2_Post form can be animated on one screen. Only 4 total branch/parameter
combinations can be animate at the same time.
2) Select the branch for each file
3) Select the parameters for each branch.
4) Press “Animate”

Whatcom Reservoir Example

Output of grid to kml or Google Earth file
for Easting
these can
be obtained
from Google
Earth. You
to start your
grid. For
the world

You also
must set the
UTM zone.
For Lake
this is
shown in
Earth if you
set the x-y
to UTM.

Calibration Data

Data file for

reading in
the data file

Data file for

The data import format is as follows:

Vertical Profiles - Calibration Data: Date/Time Vertical Profiles - Calibration Data: Julian Date

File Contents
Line1: Text description of file contents (ignored by W2_Post)
Line2: A line containing the parameter numbers (from the W2 parameters being modeled) that
are included in this calibration file. Any number of parameters can be included, one
parameter per column.
Line3 and Line4: Description and units (ignored by W2_Post).
Column Definitions:

W2 model branch number
Distance upstream of the most downstream segment face of the
specified branch

Date/Time or Julian Date: A valid date time formatted field (must include time), or
A valid Julian date from the start date of the model (e.g. 2004-01-01)

Depth of the measurement


Measurement value corresponding to each depth. Each parameter in
a column. Use -999 to indicate missing values. All columns must be

Example Form showing the calibration file settings after loading the specified file (using “Load

Using the “Calib Stats” button on the main W2_Post form, the user will see the W2_Tool
Calibration Summary form. The user must select the parameter to compute then click on the
“Compute” button. W2_Post will then compute the profile statistics and summarize all of the
measured profiles in the summary, as seen below.

After computing the summary statistics, the user can view the profiles by clicking on the “Show
Profiles”. Eight profiles are shown per page. Plotting control is available using the “X Axis” and
elevation settings on the form. The profiles can be saved as metafiles using the “Export Plots”
button. An example is shown below.


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Page Count                      : 24
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Author                          : Paul M. Craig
Creator                         : Microsoft® Word 2016
Create Date                     : 2016:06:06 11:41:39-07:00
Modify Date                     : 2016:06:06 11:41:39-07:00
Producer                        : Microsoft® Word 2016
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