Before revision: Function The broad crested weir at the Thorp grist mill in Thorp, Washington, USA Commonly, weirs are used to prevent flooding, measure water discharge, and help render rivers more navigable by boat.
After revision: Function The broad crested weir at the Thorp grist mill in Thorp, Washington, US Commonly, weirs are used to prevent flooding, measure water discharge, and help render rivers more navigable by boat.