Tool Name	Isochrones Variable Speed
Tool ID	30
Library ID	ta_hydrology
Version	1.0
Author(s)	V.Olaya (c) 2004, V.Wichmann (c) 2015

Description

Calculation of isochrones with variable speed.
In case a cell in an optional input grid is NoData, the corresponding parameter value will be used instead of skipping this cell.
This is the non-interactive tool version, where the target point can be specified either as point shapefile (the first point in the file will be used) or by target coordinates.

References

Al-Smadi, Mohammad (1998): Incorporating spatial and temporal variation of watershed response in a gis-based hydrologic model. Faculty of the Virginia Polythecnic Institute and State University. MSc Thesis. online

MartÃnez Ãlvarez, V.; Dal-RÃ© Tenreiro, R.; GarcÃa GarcÃa, A. I.; Ayuga TÃ©llez, F. (n.d.): ModelaciÃ³n distribuida de la escorrentÃa superficial en pequeÃ±as cuencas mediante SIG. EvaluaciÃ³n experimental.

Olaya, V. (2004): Hidrologia computacional y modelos digitales del terreno. Alqua. 536 pp.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	DEM
Slope	grid, input	SLOPE
Catchment Area	grid, input	FLOWACC
Curve Number	grid, input, optional	CN
Manning's N	grid, input, optional	MANNING
Target Point	shapes, input, optional	TARGET_PT	A point shapefile with the target point.
Output
Time Out(h)	grid, output	TIME
Speed (m/s)	grid, output	SPEED
Options
Avg. Manning's N	floating point number	AVGMANNING		Default: 0.150000
Avg. Curve Number	floating point number	AVGCN		Default: 75.000000
Mixed Flow Threshold (ha)	floating point number	THRSMIXED		Default: 18.000000
Channel Definition Threshold (ha)	floating point number	THRSCHANNEL		Default: 360.000000
Avg. Rainfall Intensity (mm/h)	floating point number	AVGRAINFALL		Default: 1.000000
Channel side slope(m/m)	floating point number	CHANSLOPE		Default: 0.500000
Min. Flow Speed (m/s)	floating point number	MINSPEED		Default: 0.050000
Target X Coordinate	floating point number	TARGET_PT_X	The x-coordinate of the target point in world coordinates [map units]	Default: 0.000000
Target Y Coordinate	floating point number	TARGET_PT_Y	The y-coordinate of the target point in world coordinates [map units]	Default: 0.000000