We cover all variants of Drainages, for example; Point drainage, which intercepts water at gullies. Gullies connect to drainage pipes beneath the ground surface and deep excavation is required to facilitate this system. Channel drainage, which intercepts water along the entire run of the channel meaning that the interception rate of channel drainage is greater than point drainage and the excavation required is usually less deep. These operations are always best performed in spring or summer, when the ground is dry.