R/prepare_SSURGO_hydro_data.R
prepare_SSURGO_hydro_data.RdGet and prepare basic soil hydraulic parameters from SSURGO via SDA
prepare_SSURGO_hydro_data(cokeys, max.depth)vector of component keys (cokey) in current SSURGO snapshot
target depth of aggregation (cm), corrected later by real soil depth as reported by slab()
a list containing:
SPC: SoilProfileCollection
agg: aggregate representation of hydraulic parameters, by cokey
The following soil hydraulic properties are included:
| variable | description |
| cokey | component key |
| hzname | horizon name |
| hz_top | horizon top depth (cm) |
| hz_bottom | horizon bottom depth (cm) |
| thick | horizon thickness (cm) |
| sat | VWC at saturation (cm/cm) |
| fc | VWC at field capacity defined by 1/3rd bar tension (cm/cm) |
| fc_tenthbar | VWC at field capacity defined by 1/3rd bar tension (cm/cm) |
| pwp | VWC at permanent wilting point or 15 bar tension (cm/cm) |
| awc | total sand content (<2mm fraction, mass %) |
| sand | total silt content (<2mm fraction, mass %) |
| silt | total clay content (<2mm fraction, mass %) |
| clay | total sand content (<2mm fraction, mass %) |
| dbthirdbar | bulk density at 1/3 bar tension (g/cm^3) |
| ksat | Ksat (um/second) |
| soil_fraction | volume fraction of soil (1 - coarse fragment volume fraction) |
Weighted mean soil hydraulic parameters are returned over the interval of 0-max.depth, calculated by aqp::slab().