Summary:

#### Depth to Bedrock

The hydrologically and biogeochemically active portion of the soil column may be restricted to a thickness less than the maximum soil depth. To account for this, a depth-to-bedrock dataset can be provided, which may vary spatially. This allows the number of soil layers used in the hydrologic and biogeochemical calculations, `N_bedrock`, to be specified, subject to the constraint that `N_bedrock` must be less than or equal to the total number of soil layers, `N_levsoi`. 

The default depth-to-bedrock values are from the Pelletier et al. [2016] study.