The data pertaining to a stream-gauging operation at a gauging site are given below. The rating equation of the current meter is v= 0.51 N, + 0.03 m/s where N, = revolu- tions per second. Calculate the discharge in the stream. Distance from left water edge (m) Depth (m) Revolutions of a 1.0 3.0 5.0 7.0 9.0 11.0 12.0 1.1 2.0 2.5 2.0 1.7 1.0 current meter kept at 0.6 depth Duration of 39 58 112 90 45 30 observation (s) 100 100 150 150 100 100

Q: what is the moment at point O

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Open Channel Flow

Open channel flow is a branch of fluid mechanics. It deals with the flow of fluid in an open conduit or free surface. In an open channel flow, gravity induces the flow of water whose surface is open to the air. This flow is free-falling rather than confined in rigid body conduits. The open channel flow depends upon two parameters that are the cross-section of the conduit and the velocity profile. Practical examples of open channel flow are streams, rivers, canals, and other drainage systems.In open channel flow, the cross-sectional area of at least one of the sides is exposed to air, and the surface of water faces atmospheric pressure. This flow is also known as free gravity flow. The cross-sectional area of the conduit can be either man-made or a natural channel. For instance, the flow in rivers and streams are natural conduits, and the flow in a canal and sanitary systems are man-made or engineered channels.