HORIZON Hydraulics is tabular data that can be used in conjunction with any of the NATMAP products, excepting NATMAP soilscapes.

HORIZON Hydraulics includes very detailed descriptions of the hydraulic properties pertaining to each layer, or horizon for each of the soils. This data is based heavily on laboratory based analyses.

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HORIZON Hydraulics data and description

The table below describes the various properties within this data product. Each table contains the information outlined below.

Property	Example from data	Description
HORID	1	Unique Horizon Identifier (Defines one Horizon (depth range, series, landuse))
SERIES	17	Soil series code for each series, this is a 4 digit numeric code
SERIES_NAME	ANGLEZARKE	Soil series name
LU_GROUP	PG	Landuse Group - AR (Arable) PG (Permanent Grass) LE (Ley Grassland) or OT (Other)
DESIGNATION	E	Layer Designation - At a basic level A (Topsoil) B (subsoil) C (Parent Material) E (Elluvial) O (Organic)
UPPER_DEPTH	20	Horizon upper depth in cm (<0 indicated litter layer)
LOWER_DEPTH	35	Horizon lower depth in cm (999 implies depth below bottom of profile)
BULK_DENSITY	1.28	Bulk density (g/cm3) observed
PARTICLE_DENSITY	2.63	Calculated particle density (g/cm3)
TOTAL_POROSITY	51.2	Total pore space (%) volume - Shardlow data
THV5	16	THV5: volumetric water content (%) at 5 kPa tension (field capacity)
THV10	11.5	THV10: volumetric water content (%) at 10 kPa suction (equated with field capacity in sandy soils
THV40	6.1	THV40: volumetric water content (%) at 40 kPa suction
THV200	3.2	THV200: volumetric water content (%) at 200 kPa suction
THV1500	1.8	THV1500:volumetric water content (%) at 1500 kPa suction (wilting point)
KSAT_SV	804.1	Calculated saturated hydraulic conductivity (sub-vertical)
KSAT_LAT	859.7	Calculated saturated hydraulic conductivity (lateral)
TH_S	0.3401	Calculated water content at quasi-saturation (w/w)
TH_R	0.0085	Calculated residual water content (w/w)
VAN_ALPHA	0.1325	Calculated Van Genuchtens parameter, alpha.
VAN_N	1.5373	Calculated Van Genuchtens parameter (n)
VAN_M	0.3495	Calculated Van Genuchtens parameter (m)

Note: Quality information (*_QA) relevant to the texture, organic carbon and pH values is provided. Where the data is averaged from measured sample data the standard deviation is recorded unless their were too few samples in which case Not Applicable (NA) is entered. In some cases an expert soil scientist provided a meaningful value for the parameter in which case the value is labeled 'EXPERT'. Where no meaningful value is derivable a reason is given whether as a result of rock, rubble, ironpan or peat. The coarse and medium sand values have as yet only been derived for the 'A' horizons, therefore subhorizons are labeled 'ND' for Not Derived.

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