The DWG tab functions to help the user separate tasks that are
done using the GeoFluv method in Natural Regrade from other tasks
that are done in a CAD environment that do not relate to the
GeoFluv method. For example, the user may make minor edits to
ridgelines and not upset the projects hydrologic balance whereas
editing channel profiles can result in knickpoints and immediate
erosion consequences. The command buttons are ordered from
top to bottom in logical sequences for working with a draft GeoFluv
design that is made when running the Draw Design Surface button in
Output tab.
Check Ridgeline Slope: The Check Ridgeline Slope command
allows the user to inspect the sub-watershed ridge and swale toe
slopes in the entire design. This is useful because it is
possible that the user input settings: the Surface for Elevations,
GeoFluv boundary line, valley input lines, Global settings and
Current Channel Settings may result in areas where the resulting
valley wall slopes do not drain into the channels, but instead the
storm water runoff runs sub-parallel to the channel for some
distance. This could result in rill or gully erosion.
The Check Ridgeline Slope command helps the user identify areas
where this may be happening and determine why it is happening so
that the design may be edited to correct the problem.
When the command is run, a pop-up dialog gives the user the options
to generate a report, draw symbols corresponding to the slope
values in the report, and to specify the type of symbol used and
the layer it is drawn on, and to scale the symbol. After the
user specifies the preferences and clicks, OK, the command runs and
displays the specified information.
The naming convention for the lines is to identify the
sub-watershed, e.g., main L2R1 (note L and R are capitalized when
identifying channels and their subwatersheds), followed by the
sub-watershed ridge or swale line identification where lower case
‘r’ indicates a sub-watershed ridge line and a lower case ‘s’
indicates a sub-watershed swale line. The sub-watershed ridge
or swale line letter is followed by a number indicating its
sequential order from the head of the sub-watershed. Using
this convention, the ‘main L2R1 r1’ designation identifies the
first sub-watershed ridge on the right valley wall (r1) of the
sub-watershed that holds the first tributary entering from the
right valley wall (R1) of the second tributary entering from the
left valley wall (L2) of the main channel.