OR/15/002 Appendix 3: Tables for vulnerability classification
Ó Dochartaigh B É,Doce D D, Rutter H K and MacDonald A M. 2015. User Guide: Groundwater Vulnerability (Scotland) GIS dataset, Version 2. Revised Report. British Geological Survey Internal Report, OR/15/002. |
These tables are used, with the rules in Section 3, to define the assigned vulnerability class for each given combination of input parameters. They have been slightly modified from the tables used to derive Version 1 of the groundwater vulnerability dataset (Ball et al. 2004), as follows:
- Vulnerability Class 4 has been subdivided throughout into two sub-classes, Class 4a and Class 4b. Class 4a includes areas where superficial deposits have low permeability; Class 4b includes areas where superficial deposits have moderate or high permeability. The tables have been amended to reflect this.
- Because of this change, one table (the original Table 2) has been removed as no longer needed.
The following abbreviations and legend are used in the tables:
- VH = Very High permeability
- H = High permeability
- M = Moderate permeability
- L = Low permeability
- n/a = not applicable
Highest ......................................................................................................................................Lowest | |||||
5 |
4a |
4b |
3 |
2 |
1 |
Fractured bedrock, no soil or superficial deposits | |
Fractured bedrock, no soil or superficial deposits |
5 |
Superficial deposits thickness (m) | ||
<1 | ||
Soil permeability | H |
5 |
M |
5 | |
L |
4a |
Superficial deposits thickness (m) | |||||
1-3 |
3-10 |
10-30 |
> 30 | ||
Superficial deposits |
VH or H |
4a |
4a |
3 |
2 |
M |
4a |
3 |
2 |
1 | |
L |
4b |
2 |
1 |
1 |
Superficial deposits thickness (m) | |||||
<3 |
3-10 |
10-30 |
> 30 | ||
Superficial deposits |
VH or H |
n/a |
1 |
1 |
1 |
M |
n/a |
1 |
1 |
1 | |
L |
n/a |
1 |
1 |
1 |
Depth to Water in Superficial Deposits (m) | |||||
<3 |
3-10 |
10-30 |
> 30 | ||
Superficial deposits |
VH or H | 4a |
4a |
3 |
2 |
Depth to Water in Bedrock (m) | |||||
0-3 |
3-10 |
10-30 |
30+ | ||
Bedrock permeability | VH or H |
5 |
5 |
4a |
3 |
M |
5 |
4a |
3 |
3 | |
L |
5 |
4a |
3 |
3 |
Depth to Water in Bedrock (m) | |||||
0-3 |
3-10 |
10-30 |
30+ | ||
Bedrock permeability | VH or H |
5 |
5 |
4a |
3 |
M |
5 |
4a |
3 |
3 | |
L |
5 |
4a |
3 |
3 |
Depth to Water in Bedrock (m) | |||||
0-3 |
3-10 |
10-30 |
30+ | ||
Bedrock permeability | VH or H |
4a |
4a |
3 |
3 |
M |
4a |
3 |
3 |
3 | |
L |
4a |
3 |
3 |
3 |
Depth to Water |
Bedrock |
High permeability superficial deposits thickness (m) | ||||
<3 |
3-10 |
10-30 |
>30 |
=>5m clay | ||
<10 m |
VH or H |
4a |
4a |
3 |
2 |
1 |
M |
4a |
3 |
3 |
2 |
1 | |
L |
4a |
3 |
2 |
2 |
1 | |
10-30 m |
VH or H |
4a |
3 |
3 |
2 |
1 |
M |
3 |
2 |
2 |
2 |
1 | |
L |
3 |
2 |
2 |
1 |
1 | |
>30 m |
VH or H |
3 |
3 |
2 |
2 |
1 |
M |
3 |
2 |
2 |
1 |
1 | |
L |
3 |
2 |
1 |
1 |
1 |
Depth to Water in Bedrock (m) |
BedrocK |
Moderate permeability superficial deposits thickness (m) | ||||
<3 |
3-10 |
10-30 |
>30 |
=>5m clay | ||
<10 m |
VH or H |
4a |
3 |
2 |
2 |
1 |
M |
4a |
3 |
2 |
2 |
1 | |
L |
3 |
2 |
2 |
1 |
1 | |
10-30 m |
VH or H |
4a |
3 |
2 |
2 |
1 |
M |
3 |
2 |
2 |
2 |
1 | |
L |
3 |
2 |
1 |
1 |
1 | |
>30 m |
VH or H |
3 |
2 |
2 |
2 |
1 |
M |
3 |
2 |
2 |
1 |
1 | |
L |
3 |
1 |
1 |
1 |
1 |
Depth to Water |
Bedrock permeability |
Low permeability superficial deposits thickness (m) | ||||
<3 |
3-10 |
10-30 |
>30 |
=>5m clay | ||
<10 m |
VH or H |
4b |
2 |
1 |
1 |
1 |
M |
4b |
2 |
1 |
1 |
1 | |
L |
3 |
2 |
1 |
1 |
1 | |
10-30 m |
VH or H |
3 |
2 |
1 |
1 |
1 |
M |
3 |
2 |
1 |
1 |
1 | |
L |
3 |
1 |
1 |
1 |
1 | |
>30 m |
VH or H |
3 |
2 |
1 |
1 |
1 |
M |
3 |
1 |
1 |
1 |
1 | |
L |
3 |
1 |
1 |
1 |
1 |