On a tributary of the South Skunk River in Iowa, USDA-ARS has worked with a collaborating farmer to evaluate the use of saturated buffers. This site 1,000 ft. long by 120 ft. wide with switchgrass as the dominant vegetation. Tile drainage is intercepted at the field edge and then distributed laterally along the buffer through shallow subsurface tiles. Water then infiltrates into the soil below the vegetated buffer and slowly filters through the soil to the adjacent waterway.