 In 2007 ownership of the reservoir was transferred from Scottish Water to the City of Edinburgh Council, the Council undertook modifications to the outflow in 2007–2008 as part of the Water of Leith Flood Prevention Scheme so that the reservoir could be used to store flood water and regulate the downstream flow of the Water of Leith.Harperrig reservoir lies in the middle of a basin on the northwestern side of the Pentland Hills some from south west of Edinburgh.The dam is in height and is in length.