The Glenderamackin catchment covers the watercourses upstream of Keswick that join to form the River Greta. The catchment is steep and mountainous and part of the Lake District National Park, covering 100 km².
Due to its position in the landscape, Keswick town has a long history of flooding. Land use changes, agricultural drainage and an increase in extreme rainfall events contribute to an increasing flood risk in Keswick and devastating floods have occurred in 2005, 2009 and most recently in 2015, when over 515 properties were flooded. In 2012, a £6 million flood defence scheme was completed, led by the Environment Agency, to protect 180.Because of the investment in Keswick in recent years, appraisals in 2018 have concluded that it is not currently viable to construct further flood defences through the town.
Managing the landscape to allow it to store and slow flood water could help to reduce flood risk to Keswick. Measures such as peat restoration, tree planting and water storage areas could also provide habitat for a wider range of species, improve water quality and help to manage the large volumes of gravel that get washed downstream during floods. The landscape is dominated by farming and any changes should also improve the sustainability of the farm business.