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Ag Data Mapping Solution - ADMS User Manual
Creating Topography & Watersheds
Creating the Topography Map
Running the Watershed Modeling Routine
Open into the ―Map Window‖

Select the desired ―Client‖, ―Farm‖ and ―Field‖.

Turn on the ―Altitude.grd‖ or ―Lidar.grd‖ for the field

Top Tool Bar select ―Process‖ and ―Watershed Modeling‖
1. In the ―Select Topography Source‖ drop down, select the layer
that was created in the ―Grid Points‖ method on the previous
page.
2. In the ―Elevation Unit‖ drop down box, select whether the
input data for the elevation surface is in feet or meters. This
setting is necessary for computing the slope of each cell in the
field. The horizontal units are in meters, by defining whether
the units are in feet or meters, the % slope is calculated
correctly.
3. For a starting point, leave the ―Flow Density‖ set at 50. This
number can be raised or lowered, to provide more or less
detail in the flow accumulation layer.
Raising this number provides more detailed flow paths.
4. Click ―Run‖ in the ―Create Watershed Layers‖ Frame:
5. When the progress bars disappear, a view like the one below
will be displayed. That view is the flow accumulation layer over
the top of the watershed‘s layer.
6. The flow paths should make sense to you when you look at
them. If they do not, there may be some false data in the topography layer that is not representative of what is happening
in the real world. Looking at the depressions layer to see if the
areas
defined as concave
―bowl‖ shaped areas in the
field are correct will help to
determine if the data is correct.
Excessive area
showing up in the depressions layer may indicate that
an outlet for water was not
represented correctly in the
topography map.
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