Sub-Surface Layers for ECMWF's ERA40 Model

This table describes the 4 sub-surface layers used in ECMWF's ERA40 model. All depths are in meters.

LayerECMWF Name Top
(m)		Bottom
(m)
1 STL1/SWVL1 0 0.07
2 STL2/SWVL2 0.07 0.28
3 STL3/SWVL3 0.28 1.00
4 STL4/SWVL4 1.00 2.89

ECMWF has an online description of the soil water units here.