The present invention relates to ground drainage apparatus comprising a ground anchor (13) and a length of conduit (10) providing a drainage channel for water. The length of conduit (10) is secured to the ground anchor (13) in such a way that when the ground anchor (13) is driven into the ground then the length of conduit (10) is dragged through a passage in the ground formed by the ground anchor (130 with the result that when the ground anchor is installed at a desired depth then the length of conduit (10) provides a drainage channel in the ground.