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.