The associated model and definition that demonstrating the use of this component can be downloaded here.
Flow Saturation
Using surface water flow paths to display saturation gradients.
The FlowCatchment
component uses the collection of precalculated flow paths to calculate the relative amount of surface infiltration across a given landform.
To do so, it takes the points that make up each of the flow paths and identifies the nearest segment of the mesh of surface. That segment then has a ‘volume’ of water added to it. Areas of the landform covered by many sets of flow paths will register as having a greater volume of water.
The precision of this volume is controlled by two parameters, The Start Volume
parameter is a ‘budget’ of water that each flow path represents. The Segment Loss
parameter is the rate of loss that occurs at each point within the flow path. So if a path begins with a Start Volume
of 1000
and a Segment Loss
of 0.1
, each point within the path will add 10
to the nearest mesh/surface segment and subtract 10
from the volume assigned to that path. When the flow path ends it discharges all of the remaining volume (if any) at its end point.
Identify the saturation levels across terrain given flow paths
Mode  Name  ID  Description  Optional  Type 

Mesh 
M

Base landscape form (as a mesh) for the flow calculation 
MeshParameter


Flow Paths 
C

The flow paths as generated by the flows component 
CurveParameter


Start Volume 
V

The quantity of water that each path ‘starts with’ 
NumberParameter


Segment Loss 
T

The decimal percent (e.g. 0.15 for 15%) of the initial volume that is lost in each segment 
NumberParameter

If
Segment Loss
is set to 0 then theStart Volume
value will always be used at each point.