Movement of a pesticide from a treated field by surface water and eroding sediment. Loss of formulation off foliage during spray application, particularly at high volume.         [ I-J-K]  [ M-N] [ O-P] [ Q-R]   [ U-V] [ W-X-Y-Z
Water which, having fallen, flows across the surface of the ground (or a landfill or other accumulation of material), picking up materials such as soil, agricultural chemicals and other transportable materials, continuing into a watercourse.
The build up of water occurring at ground surface level at times when rainfall cannot be absorbed by the soil, as particularly occurs in urban areas where the ground is covered by concrete and other non-permeable materials.