# Catchment Area (Flow Tracing)

O.Conrad (c) 2001
Flow tracing algorithms for calculations of flow accumulation and related parameters. These algorithms trace the flow of each cell in a DEM separately until it finally leaves the DEM or ends in a sink.
References:
Rho 8 (this implementation adopted the original algorithm only for the flow routing and will give quite different results):
- Fairfield, J. / Leymarie, P. (1991):
'Drainage networks from grid digital elevation models',
Water Resources Research, 27:709-717
Kinematic Routing Algorithm:
- Lea, N.L. (1992):
'An aspect driven kinematic routing algorithm',
in: Parsons, A.J., Abrahams, A.D. (Eds.), 'Overland Flow: hydraulics and erosion mechanics', London, 147-175
DEMON:
- Costa-Cabral, M. / Burges, S.J. (1994):
'Digital Elevation Model Networks (DEMON): a model of flow over hillslopes for computation of contributing and dispersal areas',
Water Resources Research, 30:1681-1692

## Parameters

Grid system
Grid system
  Grid system
Elevation
Input Grid
Sink Routes
Input Grid
Weight
Input Grid
Material
Input Grid
Target
Input Grid
Catchment Area
Output Grid
Catchment Height
Output Grid
Catchment Slope
Output Grid
Total accumulated Material
Output Grid
Accumulated Material from _left_ side
Output Grid
Accumulated Material from _right_ side
Output Grid
Step
Integer
  Minimum: 1.0
Method
Choice
  Available choices: Rho 8, Kinematic Routing Algorithm, DEMON
DEMON - Min. DQV
Floating point
  DEMON - Minium Drainage Quota Volume (DQV) for traced flow tubes
  Maximum: 1.0
Flow Correction
Boolean