Passive Capillary (PC) Drainage is the only drainage system that can be pulled into the green at narrow three foot spacing for more efficient drainage. Layering is common in putting green soils and occurs when a sandy root zone overlies a finer textured native soil, which is typical after years of topdressing. In these push-up greens the interface is often too close to the surface, resulting in "wet soil" problems for the turf. Even in USGA greens, excess water tends to perch where the sandy root zone interfaces the gravel layer. This perched water is held at a slight suction, so it is unable to enter conventional drainage systems.
Passive Capillary Drainage works two ways...
PC Drainage elements are placed at the bottom of a narrow sand curtain, which gives water trapped at the soil interface an exit. The unique element has an open stainless steel mesh core to remove large amounts of water quickly through gravity flow. The element is made of highly conductive fiberglass, in which the spaces between the fibers match the pore sizes of a sandy root zone. The result is a system that drains fast with passive gravity drainage and wicks away excess soil moisture with capillary suction throughout the day. No motors, pumps, or energy using equipment is required. The PC Drainage system creates a very effective" hanging water column” suction effect that follows the natural contours of the green, is installed only where drainage problems exist, and helps improve turf health by providing better drainage in chronically wet soils.