How is the flow depth measured in a Palmer-Bowlus flume?

In a Palmer-Bowlus flume, flow depth is measured from the floor of the flume to the water surface at the measuring point. This technique is essential for accurately determining the flow rate in open channels. The measurement taken from the bottom of the flume allows for consistency and reliability, as it takes into account variations in the water surface elevation above the flume’s base.

Measuring from the floor ensures that the depth reflects the actual flow characteristics at that specific location within the flume, as flow can significantly vary due to changes in water volume or flume configuration. Accurate measurement at this referenced point is crucial for calculating flow rates and assessing the performance of the flume under varying conditions.