Figure 49. Zone 3 is a flat grassy area about 10m wide at the urban/buffer interface. Its major function is to convert channelized urban flow into sheet flow and slow water velocity to less than 0.3 m/sec. Zone 3 performs some settling, filtering, and infiltration.
Credit: Photos are of the "Difficult Run" urban riparian project, courtesy of Judy Okay, Virginia Department of Forestry.