Decreases in Runoff and Sediment Yield by Drainageby Jonathan D. Istok, Oregon State Univ, Dep of Soil, Science, Corvallis, OR, USA,
Larry Boersma, Oregon State Univ, Dep of Soil, Science, Corvallis, OR, USA,
Abstract: Runoff and sediment yield from three small agricultural watersheds were measured during four winter rainfall seasons. Following two rainfall seasons of data collection, a subsurface drainage system was installed on one of the three watersheds. Measurements indicate that runoff and sediment yield from this watershed were decreased by 65% and 55%, respectively, following drainage. It is concluded that the effects of subsurface drainage on watershed behavior need to be included in river basin resource planning.
Subject Headings: Watersheds | Subsurface drainage | Runoff | Sediment | Rain water | Rainfall-runoff relationships | Seasonal variations | Drainage systems
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