7D Buried Valleys
This hydrogeologic setting is characterized by thick deposits of sand and gravel that have been deposited in a former topographic low (usually a pre-glacial river valley) by glacial meltwaters. These deposits are capable of yielding large quantities of ground water. The deposits may or may not underlie a present-day river and may or may not be in direct hydraulic connection with a stream. Glacial till or recent alluvium often overlies the buried valley. Usually the deposits are several times more permeable than the surrounding bedrock. Soils are typically a sandy loam. Recharge to the sand and gravel is moderate and water levels are commonly relatively shallow, although they may be quite variable.
Setting: 7D6 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
5-15 |
5 |
9 |
45 |
Net Recharge |
10+ |
4 |
9 |
36 |
Aquifer Media |
Sand & Gravel |
3 |
9 |
27 |
Soil Media |
Gravel |
2 |
10 |
20 |
Topography |
0-2 |
1 |
10 |
10 |
Impact of Vadose Zone |
Sand & Gravel |
5 |
9 |
45 |
Hydraulic Conductivity |
1000-2000 |
3 |
8 |
24 |
GWPP Index |
207 |
|
Setting: 7D8 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
30-50 |
5 |
5 |
25 |
Net Recharge |
10+ |
4 |
9 |
36 |
Aquifer Media |
Sand & Gravel |
3 |
9 |
27 |
Soil Media |
Silty Loam |
2 |
4 |
8 |
Topography |
2-6 |
1 |
9 |
9 |
Impact of Vadose Zone |
Sand & Gravel |
5 |
9 |
45 |
Hydraulic Conductivity |
1000-2000 |
3 |
8 |
24 |
GWPP Index
|
174 |
|
Setting: 7D13 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
5-15 |
5 |
9 |
45 |
Net Recharge |
4-7 |
4 |
6 |
24 |
Aquifer Media |
Sand & Gravel |
3 |
8 |
24 |
Soil Media |
Muck |
2 |
2 |
4 |
Topography |
0-2 |
1 |
10 |
10 |
Impact of Vadose Zone |
Silt/Clay |
5 |
5 |
25 |
Hydraulic Conductivity |
700-1000 |
3 |
6 |
18 |
GWPP Index
|
150 |
|
Setting: 7D15 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
15-30 |
5 |
7 |
35 |
Net Recharge |
10+ |
4 |
8 |
32 |
Aquifer Media |
Sand & Gravel |
3 |
9 |
27 |
Soil Media |
Gravel |
2 |
10 |
20 |
Topography |
2-6 |
1 |
9 |
9 |
Impact of Vadose Zone |
Sand & Gravel |
5 |
9 |
45 |
Hydraulic Conductivity |
1000-2000 |
3 |
8 |
24 |
GWPP Index
|
192 |
|
Setting: 7D17 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
5-15 |
5 |
9 |
45 |
Net Recharge |
4-7 |
4 |
6 |
24 |
Aquifer Media |
Sand & Gravel |
3 |
8 |
24 |
Soil Media |
Silty Loam |
2 |
4 |
8 |
Topography |
0-2 |
1 |
10 |
10 |
Impact of Vadose Zone |
Silt/Clay |
5 |
5 |
25 |
Hydraulic Conductivity |
1000-2000 |
3 |
8 |
24 |
GWPP Index
|
160 |
|
Setting: 7D18 |
General
|
Feature |
Range |
Weight |
Rating |
Index |
Depth to Water |
5-15 |
5 |
9 |
45 |
Net Recharge |
4-7 |
4 |
6 |
24 |
Aquifer Media |
Sand & Gravel |
3 |
8 |
24 |
Soil Media |
Sandy Loam |
2 |
6 |
12 |
Topography |
0-2 |
1 |
10 |
10 |
Impact of Vadose Zone |
Silt/Clay |
5 |
5 |
25 |
Hydraulic Conductivity |
700-1000 |
3 |
6 |
18 |
GWPP Index
|
158 |