Question

A stilling well is required when the stage measurement is made by employing

• A. Bubble gauge
• B. Float gauge recorder
• C. Vertical staff gauge
• D. Inclined staff gauge

Answer 1

The correct option is B Float gauge recorder

The Float-operated stage recorder is the most common type of automatic stage recorder in use. In this a float operating in a stilling well is balanced by means of a counterweight over the pulley of a recorder.
To protect the float from debris and to reduce the water surface wave effects on the recording, a stilling well is provided in all float-type stage recorder installations.