River gauging

◆River gauging◆

🔸 River gauging involves the measurement of discharge of a river and the establishment of gauge post on one its banks.

🔸 The levels of water in a stream are taken by means of gauge post

🔸 Coconut is most suitable for use as surface float for measuring velocity in a river

🔸 The velocity of a stream obtained by using rod is the mean velocity

🔸 The science and practice of water flow measurement is known as hydrometry.

🔸 The slope area method is extensively used in estimation of flood discharge based on high water marks

🔸 The dilution Method of stream gauging is used measuring discharges in steady flow in a small turbulent stream.

🔸 Mean velocity with current meter at depth

👉 One point method : 0.6d

👉 Two point method : 0.2d to 0.8d

👉 Three point method : 0.2d, 0.6d & 0.8d

🔸 To obtain mean velocity of flow in a stream, the velocity determine by float is multiplied by factor equal to 0.85