SOILSERIES Hydrology is tabular data that can be used in conjunction with any of the NATMAP products except NATMAP soilscapes.

SOILSERIES Hydrology provides extensive information on the water regime and hydrology of each soil. This is the essential dataset for those involved with groundwater modelling and flow prediction. It has many uses in the environmental sector and applications in related sectors.

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SOILSERIES Hydrology 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
SERIES	4	Soil series code
SERIES_NAME	ADVENTURERS'	Soil series name
DROCK	999	Depth (cm) to rock
HYD_ROCK	14	Hydrological rock type, Boorman, Hollis and Lilley (1995)
DGLEY	0	Depth to gleying (cm) 999 implies NO gley layer
DIMP_DP	999	Depth (cm) to slowly permeable layer, i.e. in which effectively there is no downward percolation of water - 999 implies NO slowly permeable layer (Jones 1985, Robson and Thomasson 1977).
IAC_DP	200	Integrated air capacity (downward percolation), Hodgson (1976, 73-83).
DIMP_UD	999	Depth (cm) to slowly permeable layer - upward diffusion, ie in which effectively there is no downward percolation of water (Jones 1985, Robson and Thomasson 1977) - 999 implies NO slowly permeable layer
IAC_UD	200	Integrated air capacity (upward diffusion), Hodgson (1976, 73-83)
HOST	11	HOST (Hydrology of Soil Type) class, Boorman, Hollis and Lilley (1995) Full explanation of HOST system
BYFLOW	N	Bypass flow (Yes/No)
BFI	0.93	Baseflow index. Dimensionless variable (range 0 to 1.0) that expresses the fraction of the average flow volume represented by the contribution from groundwater storage
SPR	2	Standard Percentage Run-off. Dimensionless variable (range 0 to 100 %) that represents the percentage of rainfall that causes the short-term increase in flow at the catchment outlet seen after the storm event

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Depth to a slowly permeable layer

The Depth to the slowly permeable layer refers to the depth to a soil layer having a lateral saturated conductivity of less than 10cm/day (Avery, 1980), which impedes the downward percolation of excess soil water and causes periodic saturation in the overlying layer. Soil water storage is reduced under such conditions and there is an increased rapid response to heavy rainfall.

Depth to gleyed layer

Gleying, the presence of grey and ochreous mottles within the soil, is caused by intermittent waterlogging. The particular definition of gleying used identifies soil layers wet for at least 30 days each year, or soils that are artificially drained (Hollis, 1989).

Integrated Air Capacity

The Integrated Air Capacity (IAC), or 'drainable' pore space, of a soil layer, is defined as its volumetric air content at a tension of 5KPa (roughly at field capacity). Integrated air capacity (IAC) is the average percentage air volume over a depth of 1m. This provides a surrogate for permeability in permeable soils and substrates (Hollis and Woods, 1989). In slowly permeable or impermeable soils and substrates, IAC indicates the capacity of a soil to store excess water.

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