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Online Watershed Delineation Capability

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Workshop for
Watershed
Management Using
Web-Based Decision
Support Tools
Bernard A. Engel
Jin-Yong Choi
Tools
• Web-based Watershed Delineation
• L-THIA: Long-Term Hydrologic Impact
Assessment
• SEDSPEC: Sediment and Erosion Control
Planning, Design and SPECification
Information and Guidance Tool
Web GIS Based
Online Watershed
Delineation Capability
Bernard A. Engel
Jin-Yong Choi
What is Watershed
• Watershed: A
basin, drainage or
catchment area
that is the land
area that
contributes runoff
to an outlet point
Watershed
boundary
Outlet point
Rain
Runoff
What is Watershed Delineation
• Watershed Delineation: Define the
watershed boundary based on
topographical information about an outlet
point
• Outlet point: A point on a stream or river of
interest.
Why we need Watershed Delineation
(WD) capability
• Need to understand target area and its
features that are related with hydrologic
phenomena to be analyzed at outlet point
(e.g. peak runoff)
• Control boundary (watershed) is needed to
gather hydrologic data including soil, land
use, weather
• Watershed delineation is first hydrologic
analysis step
Methodology (1)
• Traditional Approach
– Hand drawn on a
paper topographic
map
– Contour line
(Continuous line for
the same elevation
points) use
– Requires experience
and labor
– Analogue approach
– Manual
Outlet point
Methodology (2)
• Using DEM and desktop GIS software
– Digital Elevation Model (DEM): Grid format,
Each grid has elevation (altitude) value
– GIS: Geographic Information System:
Computer program for digital mapping
– Possible automatic data preparation
• WebGIS tools
– WWW + GIS: Yahoo Map, MapQuest
– Preprocessed data, limited functionalities
Where to begin?
http://pasture.ecn.purdue.edu/~watergen
Display Functions
Auxiliary Functions
Layer
Control
On/Off
Map Display
Reference Map
Display Control
Zoom in/out
Pan, Full extent
WD Submit Button
Main Menu
Using the SDSS
Indian Creek, Tippecanoe County, Indiana
Outlet point selected
Using the SDSS
Indian Creek, Tippecanoe County, Indiana
Results Page
Watershed Delineation:
Indian Creek, Tippecanoe County, Indiana
Results Page
Results display
Run hydrologic models
- Impervious Area
- L-THIA
- SEDSPEC
- Peak Runoff Estimation
Using the SDSS
Indian Creek, Tippecanoe County, Indiana
Download and Print Map
On-line Digitizing Tool:
Indian Creek, Tippecanoe County, Indiana
Land Use Change Using On-line Digitizing Tool and Run L-THIA
On-line Digitizing Tool:
Indian Creek, Tippecanoe County, Indiana
Land Use Change Using On-line Digitizing Tool and Run L-THIA
Land Use Change Report
after Digitizing
Land Use Change Using
On-line Digitizing Tool
On-line Digitizing Tool -> Input Preparation
Indian Creek, Tippecanoe County, Indiana
Land Use Change Using On-line Digitizing Tool and Run L-THIA
Land Use Change Report
after Digitizing
Scenario 1:
Before Change
Scenario 2:
After Change
Thank you !
http://pasture.ecn.purdue.edu/~watergen
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