| Subsurface
Drainage Systems |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Ø | Reflects effects
of deep drainage |
|||||||||||
| systems |
||||||||||||
| - | Tile drainage
systems |
|||||||||||
| - | Lateral, deep
drainage ditches |
|||||||||||
| Ø | Describe by: |
|||||||||||
| - | Assigning
hydrologic soil group for |
|||||||||||
| undrained and
drained soil |
||||||||||||
| - | Fraction of area
drained |
|||||||||||