### 2.2.2.2. Depth to Bedrock[¶](#depth-to-bedrock "Permalink to this headline")

The hydrologically and biogeochemically active portion of the soil column can be restricted to a thickness less than that of the maximum soil depth. By providing a depth-to-bedrock dataset, which may vary spatially, the number of layers used in the hydrologic and biogeochemical calculations, \\(N\_{bedrock}\\), may be specified, subject to the constraint \\(N\_{bedrock} \\le N\_{levsoi}\\). The default depth-to-bedrock values are from [Pelletier et al. \[2016\]](https://escomp.github.io/ctsm-docs/versions/master/html/tech_note/References/CLM50_Tech_Note_References.html#pelletieretal2016).

