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Pow of Inchaffray
Pow Water - - 730255.jpg
Upper reaches of the Pow near Balgowan
Other name(s) Pow Water
Physical characteristics
River mouth River Earn
Length 9 miles (14 km)
Basin features
Basin size 2,047 acres (8.28 km2)
Population 79 residential properties, 21 agricultural properties and 2 commercial properties
Pow Water viewed from Abbey Bridge (geograph 3200798)
The Pow from Inchaffray Abbey Bridge

The Pow of Inchaffray (also known as the Pow Water) is a drainage ditch in Strathearn, Scotland. It is approximately 9 miles (14 km) long and drains 3.2 square miles (8.3 km2) of fertile agricultural land. The Pow dates back to the Middle Ages and was dug on the orders of the canons of the nearby Inchaffray Abbey; it was expanded under permissions granted by Robert the Bruce. A drainage commission became responsible for the Pow in 1696 under an act of the Parliament of Scotland. This body, the only local drainage commission in Scotland, continues to maintain the Pow and collect revenue from local landowners. A modernised act to govern the commission was passed in 2018.


The Pow starts at Methven Moss and runs in a south-westerly direction for 9 miles (14 km) until it meets the River Earn near to Innerpeffray, about 2.5 miles (4.0 km) to the south-east of Crieff. The Pow's drainage basin is 2,047 acres (828 ha) which includes 79 residential properties, 21 agricultural properties and 2 commercial properties. It has ten major tributaries which total approximately 4.7 miles (7.6 km) of watercourse. The Pow's purpose is disputed with some claiming it to be for the drainage of groundwater and others that it is a flood prevention measure.


Pow is a Scots language term that dates to the Early Middle Ages and means an artificial ditch. The Pow was first dug on the orders of the canons of the Augustinian Inchaffray Abbey. The abbey, one of the largest in Scotland at the time, was located on an island in marshland and the Pow was intended to help drain the surroundings. Abbot Maurice of Inchaffray was chaplain to Robert the Bruce and prior to the 1314 Battle of Bannockburn claimed to have witnessed a miracle whereby the arm bone of Saint Fillan appeared in a previously empty reliquary. Robert the Bruce credited the miracle with providing his subsequent victory on the battlefield. In thanks to Maurice he granted the abbey permission to extend the Pow. The abbey went into decline after the Scottish Reformation and was gradually abandoned. Despite this the Pow remained in use.


In 1696 the Pow was brought under the formal management of a drainage commission (similar to the internal drainage boards of England and Wales) by the "Act in favour of Sir Robert Murray of Abercairney and other heritors upon the Pow of Inchaffray" passed by the Parliament of Scotland. The commission was empowered by the act to tax heritors, those landowners that benefited from the Pow, for the maintenance and improvement of the ditch. It noted that "the grass and corns of several heritors of the said lands are frequently lost and rendered useless". This act was repealed and replaced by an 1846 act (the "Pow of Inchaffray Drainage Act 1846") of the Parliament of the United Kingdom which included measures for the construction of new flood defences.

A private bill, aimed at establishing the commissioners as a body corporate to take into account changes in the size of the drainage basin and to the number of heritors, was submitted to the Scottish Parliament by the drainage commissioners in March 2017 to replace the 1846 act. It received royal assent as the "Pow of Inchaffray Drainage Commission (Scotland) Act 2019" on 17 January 2019.

The Pow drainage commission is the only local drainage commission in Scotland. It is responsible for some of the country's most fertile agricultural land and has also worked to allow residential development to take place on part of the drainage basin. The Pow has a population of non-native beavers and the commissioners have been in discussion with Scottish Natural Heritage to carry out a trial of beaver-proof fencing and water-gates.

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