Changed deep drainage
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Impact
Deep drainage refers to the water that moves through the soil to below the root zone of plants. Deep drainage is an important part of the water cycle and the natural process that recharges groundwater sources and springs that may flow into creeks and rivers. The amount of deep drainage may increase when deep-rooted perennial vegetation is cleared or water in excess of crop or pasture needs is applied by irrigation. The affect of changed deep drainage depends on many factors including soil type, depth of watertable and land use.
Suggested indicator: Depth to groundwater
Increased deep drainage may be associated with:
| Potential associated impacts | Suggested indicators |
| Mobilisation of salts, nutrients and pesticides from the soil leading to increased concentrations of these substances in groundwater |
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A rise in watertable levels may contribute to:
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Development of spring flows in other parts of the landscape where waterlogging may occur |
Reduced deep drainage may be associated with:
| Potential associated impacts | Suggested indicators |
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Reduced groundwater recharge dropping watertable levels and leading to:
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Increased soil waterlogging |
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*Yet to be developed
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© The State of Queensland (Department of Natural Resources and Water) 2008.
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