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

A stilling well is required when the stage measurement is made by employing: Correct Answer Float gauge recorder

Explanation:

The stage of a river is defined as its water-surface elevation measured above its datum (either MSL or any arbitrary datum).

Types of Automatic Gauge Recorders:

Float Gauge

  • Most common type.
  • Float operated in stilling basin is balanced by a counterweight over the pulley of the recorder.
  • Displacement of float due to rising and lowering of water surface elevation caused angular displacement of pulley and input shaft of the recorder.

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Bubble Gauge

  • In this, compressed air or gas bleeds out at a very slow rate at the bottom of the river.
  • A pressure gauge measures the gas pressure which in turn is equal to the water column above the outlet.

Types of Manual Gauge Recorders:

Staff Gauge

  • Simplest to use.
  • Measured with the help of graduated staff in contact with the water surface.

Wire Gauge

  • In this weight is lowered by a reel to touch the water surface.
  • The mechanical counter measures the rotation of the wheel which is proportional to the length of wire paid out.

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