Limitations
Some of the known limitations of this tool are discussed below.
Relationship between hydrological parameters
The tool outputs a number of hydrological parameters including mean annual runoff (mm/yr), mean annual precipitation (mm/yr) and evapotranspiration (mm/yr).
Please note, that the parameters provided by this tool do not meet the expected constraint:
[Mean annual runoff = Mean annual precipitation + Mean annual evapotranspiration] X
This constraint is not met as each parameter is obtained from a different GIS data source, each of which differ with respect to temporal resolution and coverage, spatial resolution and modelling methodology.:
Parameter |
Description |
GIS Layer : Band |
Spatial Re solution (m) |
Te mporal Reso lution |
Tem poral Cov erate |
|---|---|---|---|---|---|
|
Mean annual precipitation (mm/yr) |
WorldClim 2: |
927.66 |
Long term mean |
1970 - 2000 |
|
Mean annual precipitation (mm/yr) |
TerraClimate: pr |
4638.3 |
Long term mean |
2000 -2019 |
|
Mean annual runoff (mm/yr) |
UNH-GRDC Composite Runoff Fields V1.0 |
55659.74 |
Long term mean |
< 2000 |
|
Mean annual runoff (mm/yr) |
TerraClimate: ro |
4638.3 |
Long term mean |
< 2000 |
|
Mean annual eva potranspiration (mm/yr) |
TerraClimate: pet |
4638.3 |
Long term mean |
2000 -2019 |
|
Mean annual eva potranspiration (mm/yr) |
Regridded Monthly Terrestrial Water Balance Climatologies (UDEL) |
55659.7 |