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| Parameter | Units | Description |
|---|---|---|
Percolation rate | kgm-2s-1 | The newly proposed 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. Such defined percolation is an input for hydrological models together with e.g. water runoff. This parameter is proposed as a rate rather than the accumulated one accumulation following WMO approach in such casesrecommendations. The accumulated value can be still encoded as usually using it the rate with accumulation specified in PDT. |
Justification: The newly proposed 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. Such defined percolation is an input for hydrological models together with e.g. water runoff. There is only "Water runoff and drainage" defined in the WMO tables which is not suitable for this newly proposed parameter.
Real-life example: The newly proposed percolation rate what be the parameter K3 in the SURFEX 3-layers scheme (right picture ISBA 3-L; it is called gravitational drainage there).
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