Demonstration of ill drained soils and land use pattern according to the drainage class

1. AG 2105
Soil and Water Management
Practical No. 14
Demonstration of ill drained soils and land use pattern according to the drainage class
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P.A.S.S. Pushpakumara

2. Seven classes of natural soil drainage are recognized
• Excessively drained
• Somewhat excessively drained
• Well drained
• Moderately well drained
• Somewhat poorly drained
• Poorly drained
• Very poorly drained
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7. How to Tell if Soil is Draining Well
• Dig a hole about 12 inches wide and at least 12 to 18
inches deep.
• It doesn’t have to be measured precisely for the test
to work.
• Fill the hole with water and let it drain completely.
• Fill the hole again and measure the depth of the
water.
• Measure the depth every hour for two or three hours.
• The water level of well-draining soil will drop at least
an inch per hour.
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8. Soil compaction and drainage
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9. Poor drainage
• Bright soil colors indicate good water drainage,
while a dull color or grayish tent could indicate poor
drainage.
• Somewhat poorly drained: Soil is wet for prolonged
periods, but not all the time.
• Poorly drained: Soil remains wet for a large portion
of the year.
• Very poorly drained: Soil remains wet year-round as
the water table remains at or near the surface year-
round.
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14. Thank you
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