Trimble Quadri Help

Virtual Flow Path

General description

When running an analysis, a "Virtual Flow Path" will move all accumulated water from the starting point to the ending point and continue the analysis from the latter point. In this context it can be used to analyze - e.g. the effect of placing a culvert under a road or building a diversion ditch alongside a road.

Note: The concept does not consider dimensioning in any way - it will move all accumulated water from its start location to its end location without delay

New Object

Press the "New Object" icon - it will highlight when active.
Pick a start point
Hold "Shift" to enable snap
When hovering the cursor it will display the elevation below
Elevation with red color is above the starting point
Elevation with green color is below the starting point
Pick your end point or next point
Repeat 4 to create a polyline
Hit "Enter" to save or "Esc" to cancel

Edit Object

Select the object first
The "Edit object" button should enable - press the button
The selected object should be in edit mode with grip points enabled
Press down your mouse button and hold the grip point, drag it to a new location and release the mouse button
Repeat 4 until all grip points are adjusted
Hit "Enter" to save or "Esc" to cancel

Workflow example

Step 1

The analysis shows an area of trapped water on the upside of your designed road.

Step 2

Create a "Virtual Flow Path" (culvert) with a starting point as illustrated

Step 3

Find an end point on the other side of the road. A green elevation value will indicate that your end point is lower than your start point.

Step 4

A proposed object and location for a culvert is created

Step 5

Running the analysis again shows that much of the trapped water will pass through the culvert, but not all.

Step 6

Deactivate the "Virtual Flow" tool. Select the object and press "Edit mode". Drag the grip points to a better suited location and press "Enter" to save.

Step 7

Run the "Point Flow" calculation again. The analysis and result should now indicate that the new location will capture most of the trapped water.

>> Analysis >> Watershed >> Design

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