GRIB-API definition
UERRA details
| Definition | The percolation is the downward movement of water under hydrostatic pressure in the saturated zone.
This water might still end up in rivers and lakes as discharge but it is a slower process than water runoff or drainage.
|
Validity | instantaneous| Such defined percolation is an input for hydrological models together with e.g. water runoff. |
| Validity | accumulated (from the beginning of the forecast) |
| Comment |
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WMO GRIB2 definition
2land surface | hydrological products |
| Parameter |
Categoryvegetation/biomass category | Parameter Number | 33| hydrology basic products |
| Parameter number | 16 | percolation rate** |
| Type of statistical processing | 1 | accumulated |
**newly approved by WMO (release in May 2016)
| Level |
|---|
| Type of first fixed surface |
| | 177 | Deep soil (of indefinite depth) |
| Scale factor of first fixed surface |
| |
| Scaled value of first fixed surface |
| |
| Type of second fixed surface |
| |
| Scale factor of second fixed surface |
| | all bits to 1 | missing |
| Scaled value of second fixed surface |
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