An area of regular post medieval drainage ditches is visible on aerial photographs. The ditches were most likely cut as part of the Knight family's attempt at improvement, probably sometime after 1841.

An area of regular post medieval drainage ditches is visible on aerial photographs on moorland to the southwest of The Chains Barrow,Exmoor. The ditches were most likely cut as part of the Knight family's attempt at improvement, probably around the time Frederic Winn Knight took over the running of the estate in 1841. Centred at approximately SS 7313 4173, the ditches run northwest to southeast across a southwest facing slope above an unnamed tributary of the River Barle. It appears that the ditches were designed to channel water into this tributary. The ditches are all cut in straight parallel lines, and cover an area of approximately 5 hectares. The whole area around The Chains is particularly boggy and peat covered, and it seems likely that the ditches were cut to drain the area prior to it being enclosed. According to Orwin, many miles of drainage ditches were cut across parts of Exmoor, but in some areas failed to provide adequate drainage for the land to be enclosed [2]. Large areas of Exmoor were successfully drained, although it appears that this area, which is still open and boggy moorland was not one of them. Other similar ditches are visible in the surrounding areas, some draining into natural streams and water courses, others appearing to drain into Pinkery Canal. Many of the ditches are associated with areas of peat cutting. [1-4]