In 1892, an Act of Parliament allowed the City of Birmingham to claim 72 square miles of upland in Mid-Wales for a scheme to supply the urban population with fresh water. This area was the gathering ground for the Elan and Claerwen rivers. The Watershed Line, defined by the scheme’s hydrologists, was calculated as the point at which the drainage of water changed direction. Simply put, all rain that fell on ground inside the Watershed Line belonged to the City of Birmingham. A series of huge dams allowed the rain to be captured and stored as it drained from the tributaries of the two rivers. The water could then be released into an aqueduct, allowing a constant flow to Birmingham.

The Watershed Line was marked by concrete posts, the majority of which still stand today. There is scant archival documentation recording the placement of the posts, but it has been suggested that a number of contractors were responsible. This would account for the subtle differences in the posts’ shape and construction.

In 2019 Kate created Walking the Pipe, a community project of songs, events and walks inspired by the 73 ½ mile aqueduct that has carried water from Mid-Wales to Birmingham for almost 120 years. As Wales emerged from the final lockdown in Spring 2021, Kate became resident artist in the Elan Valley. From May to September, she walked the Watershed Line and photographed every concrete post she encountered. In the evenings, staying alone in a remote cottage without electricity, Kate read by candlelight, listened to audiobooks and wrote new songs.

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Information sourced from the Kate Green website.