Defining context-specific scenarios to design vegetated buffer zones that limit pesticide transfer via surface runoff

Example of a buffer sizing nomogram, depending on the contributing area length, for 70% retention efficiency. Each color stands for a climatic scenario (defined by rainfall event and soil initial humidity status). Each curve shows the result for a contributive area slope of 5%, the shallow zone corresponding to a slope varying from 2 to 10%. For example, for a contributive area 175 m long, the VFS should be 13 m wide to infiltrate 70% of the incoming water during the summer rainfall occurring on a wet contributive area.61