Predicting Runoff Initiation Times Under Field Conditions in Tropical (Hawaii) Soils

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Abstract
Runoff initiation times measured during field rain‐simulation studies on 10 important Hawaii soils are examined in relation to antecedent soil‐water status. The experimental data show considerable scatter due mainly to natural soil variability within a soil series. However, the data exhibited a fairly proportional relationship between runoff initiation time and antecedent soil saturation deficit (final minus initial soil‐water content), in accordance with a simple Green‐Ampt type equation. The results indicate a potential method for estimating erosive portions of rainstorms and subsequent soil loss hazards in relation to varying antecedent soil‐water contents during different seasons of the year.
Funding Information
  • Agricultural Research Service (12‐14‐5001‐40, 12‐14‐5001‐19)

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