Available water capacity (AWC) of Scottish soils

This available water capacity dataset is based on the digital (vector) version of the soils of Scotland 1:250 000 maps and the land cover of Scotland 1988 (MLURI, 1993). The field capacity and permanent wilting point values in this data set have been calculated for each soil horizon of each soil taxonomic unit (soil series) delineated within the 1:250 000 national soil map of Scotland based on pedotransfer functions (regression equations) derived for soils in Scotland, Wales and England (Cranfield University, 2008). The pedotransfer functions used the median sand, silt, clay and organic carbon contents from the Scottish soils knowledge and information base (SSKIB) and predicted bulk densities. The map shows the available water capacity of the most extensive soil in each 1:250 000 soil map unit.


Lilly, A, Baggaley, N and Donnelly, D.  2012.  Map of available water content to 1 metre depth in soils of Scotland.  Map prepared for EU project GS-SOIL-Assessment and strategic development of INSPIRE compliant Geodata-Services for European Soil Data. ECP-2008-GEO-318004.

These data are delivered under the terms of the Open Government Licence, subject to the following acknowledgement accompanying the reproduced James Hutton Institute materials: "Contains James Hutton Institute materials © [year]".

Soil Thickness Samples Point data (Borehole-based) map legend

Map legend

Key Available water capacity (mm)
< 100 mm
100 – 150 mm
150 – 200 mm
200 – 250 mm
250 – 300 mm
300 – 375 mm
≥ 375 mm
Title Available water capacity (Scottish soils)
Source The James Hutton Institute
Enquiries info@hutton.ac.uk
Scale(s) 1:250 000
Coverage All Scotland
Format GIS point data
Price Data can be downloaded for free under an Open Data licence from Scotland's soils website. A free WMS service is also available.
Uses Local to national level use
Downloads http://www.hutton.ac.uk/research/themes/safeguarding-natural-capital/soilshutton/soils-maps-scotland/download
Map viewer View in UKSO Map Viewer
Web map service http://druid.hutton.ac.uk/arcgis/
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