The invention relates to a device for use in protecting watersheds from turf treatment contaminants particularly in relation to sports fields and golf courses. The invention further relates to methods and systems for the use of a plurality of the devices in a system to control, impede, or reduce the level of contaminants from turf treatments which enter drainage systems and catch basins associated with turf surfaces, turf sports fields, parks and golf courses. The invention relates to the device alone or in combination with a catch basin cover or in combination with a catch basin directly or in combination with a drainage riser.