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Irrigation—Principles & Practices

Unit 1.5 | Part 1 – 261

Appendix 12: Amount of Water Needed to

Pre-Irrigate a Dry Soil to Different Depths

(Approximate)*

Appendix 12: Amount of Water Needed to Pre-Irrigate

SOIL TYPE INCHES WATER PER FOOT INCHES WATER TO REACH
SOIL DEPTH 6 FEET DEEP

CLAY 1.4–1.8 8.6–10.8

SILTY CLAY 1.6–1.9 9.6–11.4

SANDY CLAY 1.6–1.9 9.6–11.4

SILTY CLAY LOAM 2.2–2.3 13.0–13.7

CLAY LOAM 2.0–2.2 12.2–13.0

SANDY CLAY LOAM 2.0–2.2 12.2–13.0

SILT-LOAM 1.8–2.0 10.8–12.2

LOAM 1.7–1.9 10.1–11.4

VERY FINE SANDY LOAM 1.7–1.9 10.1–11.4

SANDY LOAM 1.1–1.3 6.5–7.9

LOAMY VERY FINE SAND 1.1–1.3 6.5–7.9

LOAMY FINE SAND 1.0–1.2 5.8–7.2

LOAMY SAND 0.7–1.0 4.3–5.8

VERY FINE SAND 0.7–1.0 4.3–5.8

FINE SAND 0.7–1.0 4.3–5.8

SAND 0.7–1.0 4.3–5.8

COARSE SAND AND GRAVEL 0 .4–0.7 2 .2–4.3

• Based on available water holding capacity; plants have dried soil to permanent wilting point, 15 ATM.
  Assumes the soil is uniform throughout irrigation depth.