Fig. 3. Velocity fields in the vertical x₁x₂ plane just before an irrigation event for both the sandy (top) and the clay (bottom) soils. Note that the direction of the arrow is equal to the direction of the vector field at its base point; the longest vector is scaled to a length of 1, and all other vectors are scaled proportionately. Profiles of the components of the mean velocity vector, averaged over the two inner drip laterals, <u₁> and <u₂> , are also included in this figure. Terrain slope is 20%.