The Watershed Modeling System (WMS) is a
comprehensive graphical modeling
environment for all phases of watershed
hydrology and hydraulics. WMS includes
powerful tools to automate modeling
processes such as automated basin
delineation, geometric parameter
calculations, GIS overlay computations
(CN, rainfall depth, roughness
coefficients, etc.), cross-section
extraction from terrain data, and many
more! With the release of WMS 7, the
software now supports hydrologic
modeling with HEC-1 (HEC-HMS), TR-20,
TR-55, Rational Method, NFF, MODRAT, and
HSPF. Hydraulic models supported include
HEC-RAS and CE QUAL W2. 2D integrated
hydrology (including channel hydraulics
and groundwater interaction) can now be
modeled with GSSHA. All of this in a
GIS-based data processing framework will
make the task of watershed modeling and
mapping easier than ever before
The program.s modular design enables the
user to select modules in custom
combinations, allowing the user to
choose only those hydrologic modeling
capabilities that are required.
Additional WMS modules can be purchased
and added at any time. The software will
dynamically link to these subsequent
modules at run time.automatically adding
additional modeling capability to the
software.
Automated Watershed Delineation
Using digital terrain data, WMS can
automatically delineate a watershed and
sub-basins. As part of the delineation
process, basin data such as area, slope,
mean elevation, maximum flow distance,
and many other commonly-used hydrologic
parameters are automatically computed.
A new Delineation Wizard has been added
to WMS to guide first-time or novice
users of the software through the
delineation process. However, many
advanced features and options are
included in WMS: Use DEMs (grids) or
TINs for delineation. You can easily
manipulate the elevation data in either
type of dataset. Add any number of
interior outlet points and let WMS
subdivide the watershed automatically.
Manipulate stream networks to represent
man-made features or proposed changes in
the watershed. Override derived basin
boundaries to match your knowledge of
the watershed.
As part of the delineation process, WMS
finds all flow paths on the entire
terrain model. This allows you to
inspect flow patterns anywhere inside of
outside your watershed. Further, the
longest flow path in each sub-basin is
stored for use with the Time of
Concentration Calculator. No other
system available will match the accuracy
and flexibility of the delineation
functions in WMS!
GIS Tools
WMS will allow you to take advantage of
all types of GIS data available for
hydrologic and hydraulic modeling. The
GIS module of WMS 7 includes a complete
set of tools for importing, creating,
and manipulating GIS vector and raster
data. ArcGIS/ArcView is not a required
component of the WMS software! You will
find that WMS can work with your GIS
data effectively with or without ArcGIS.
A few of the powerful tools in WMS
include: Direct linkage with ESRI.s
ArcGIS 8.x - this lets you use the
powerful data catalog tools of ArcGIS in
conjunction with WMS. Terrain data can
be created, merged, and manipulated
using grids, TINs, or contour lines.
Data layers such as land use and soil
type can be clipped to match your
watershed. Attribute tables can be
joined and queried. Images (TIFF, JPEG,
MrSID) can be geo-referenced, joined,
and clipped. Attributes from data layers
can be assigned to your model using GIS
overlay operations. New .data tree.
interface allows you to turn on/off,
change display, change coordinate
systems, and review contents of each
data layer quickly and easily.
Coordinate System Conversions - Convert
data between geographic and planar
coordinate systems
Floodplain Modeling and Mapping
Whether you have used WMS to run a
HEC-RAS model or obtained hydraulic
analysis results elsewhere, the tools
for floodplain delineation and mapping
in WMS will create the results you need
for your flood study. The powerful
interpolation algorithms in WMS allow
you to create flood extents and flood
depth maps using digital terrain data
and water surface elevation data points.
You can use the fast and easy channel
hydraulics tools in WMS to create
approximate (Zone A) maps. If you need
a detailed analysis (Zone AE or AH), you
will find the HEC-RAS interface and
flood mapping tools are nicely
integrated and intuitive in WMS.
The full process of flood modeling and
mapping has been integrated into a
seamless process in WMS. Perform a
simulation with any hydrologic model
(HEC-1 or HMS, TR-20, TR-55, Rational
Method, MODRAT, NFF) and link the peak
flow or complete hydrograph to a HEC-RAS
model of the river channel in your
watershed. Complete the set up of
HEC-RAS with cross-section cutting, area
attribute mapping (roughness values
assigned by polygons), and automated
assignment of thalweg and bank locations
and downstream distances. Once a HEC-RAS
simulation is completed, you can import
the W.S.E. results directly from the
HEC-RAS project files and use them to
determine the flooding extents and
depths on the terrain model in WMS.
Stochastic Modeling
Uncertainty in modeling parameters can
now be analyzed using the automated
stochastic modeling tools in WMS. These
tools simplify and automate the process
of varying certain parameters (such as
CN or roughness) in a model, creating a
model input file, and running the
simulation over and over again. Some
applications of this technology are: Use
HEC-1 with CN randomization to create
probabilistic hydrograph results. Use
HEC-RAS with roughness randomization to
create probabilistic water surface
elevation results. Link HEC-1 and
HEC-RAS in series with randomization to
create probabilistic floodplain maps
Storm Drain Network Modeling
WMS has the capability of storm drain
analysis using the analysis code
distributed by the FHWA as part of their
HYDRAIN program. You can create a
complete storm drain network (unlimited
pipes and nodes) tightly integrated with
your surface runoff model - including
the option to link with any of the
hydrologic models supported by WMS.
StormDrain will perform all typical
hydraulic computation (HGL, WSE, etc.);
WMS provides various reporting tools for
results of the mode
2D (Distributed) Hydrology
After many years of research and
development, a 2D surface/groundwater
hydrologic model is now available in
WMS! The GSSHA model is the perfect
solution for studies which require
analysis of 2D surface flow and
groundwater/surface water interaction.
The model uses a 2D finite-difference
grid to analyze surface runoff, 1D
channel hydraulics, and groundwater
interaction in a comprehensive
hydrologic cycle model. Water quality
and sediment transport processes may
also be modeled with GSSHA. The model is
capable of single event or long term
rainfall simulation; radar rainfall data
is supported in either case. Typical
applications of this model are: Flood
forecasting (depth and velocity over
entire 2D domain) Thunderstorm
(localized rainfall) flood analysis
Surface ponding and infiltration
analysis Groundwater/surface water
interaction modeling
Data Compatibility
Obtaining and formatting digital data is
often the most time-consuming task in
watershed modeling. The WMS development
team has been hard at work ensuring that
WMS is compatible with as many file
formats as possible. Further, they have
dedicated a website to learning about
and obtaining GIS data to use with WMS.
Please visit the link below to learn
about where to download free data, how
to use it, and other informaiton.
WMS GeoSpatial Data Aquisition -
http://emrl.byu.edu/gsda/
Some of the more popular data formats
supported by WMS are: USGS DEMs -
download and use any format of DEM from
the USGS. USGS NED data - seamless
elevation data can be downloaded and
read into WMS. ArcGIS Raster (ASCII
format) - read elevation or attribute
data in gridded format from ArcGIS. ESRI
Shape files - read all shapes and
attributes into WMS. DXF and DWG CAD
files - WMS now supports the latest
versions of DXF and DWG. TIFF, JPEG, and
MrSID images - images along with
geo-referencing information can be read
by WMS.
URL: http://www.e-msi.com
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