4. the Water of Leith As Stated in the Introduction, This Will Be a Briefer
4. The Water of Leith As stated in the Introduction, this will be a briefer account than those for the other rivers, following the same template in the upper reaches, but focussing on tributaries past and present once within the city boundary of Edinburgh, until the last stretch through Leith. The sources of the Water of Leith are springs at near 400m height on the northern slopes of West Cairn Hill and Colzium Hill, in the Pentland Range. These feed three streams, rather unimaginatively named, ‘West Burn’, ‘Mid Burn’, and ‘East Burn’, which join together near the hamlet of Colzium, to form the Water of Leith, at Grid Reference NT 086 589. From here, the small river winds north-east for c2.5km until it enters Harperrig Reservoir. This large artificial body of water has a surface area of 94 hectares, and is shaped something like an open-mouthed flounder, with its tail to the south-west, where the Water of Leith enters, and with its jaws to the east. The reservoir was opened in 1860, and its function was to store water which could be used, especially during dry spells, to compensate for water abstracted from the springs referred to above, their effusions having been piped into the Edinburgh water supply. Reservoir water was released as needed to maintain the river flow which drove many mills in the 19th century. Somewhat perversely, its function has turned full-circle, as with the mills defunct, it now holds back water which would otherwise increase the risk of flooding in Edinburgh after heavy rain.
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