Perforated land drainage is designed to collect surface water by allowing it to seep through the small holes cut in the dwells of the coil and then allowing it to flow to its destination such as a Stormwater Attenuation Tank (Soakaway), or into a water course, such as a stream, lake or river. Perforated land drainage systems can be used in many applications such as agriculture to assist draining fields, construction to help relieve flooding and relieve static underground loads and retaining walls. It is also useful in sports fields, lawn or garden drainage and can also feature in French drains to improve drainage.