Hi everyone,

I'm currently conducting experiments using a stream table with a recirculating pump system. The setup includes a sediment bed (gravel-bed channel), and I’m trying to accurately calibrate the discharge flowing through the system.

Unfortunately, I don’t have access to a velocity meter or flow sensor. The flow depth is very shallow (about 2 cm), which limits the options for standard instruments. I’ve attached a photo and video of the setup for reference.

Last year, when I asked about measuring flow velocity, some colleagues recommended using a tennis ball and camera. At the moment, however, I don’t have access to a camera in the lab.

So far, I’ve been relying on:

- The bucket method (measuring volume over time)

- The floating method, using surface velocity and applying an 85% correction factor

However, I’m unsure about the accuracy—especially under low-flow conditions—where even small timing errors or water losses during the bucket transfer can introduce significant uncertainty.

Has anyone successfully calibrated a stream table without direct velocity or flow measurement tools?

Any advice, alternative methods, or references would be greatly appreciated!

Thank you in advance!

Best regards,

Maryam Akbari