(b) The following data were collected from a stream-gauging operation in a river. Compute the discharge by (i) mid-section method (ii) mean-section method. Distance from left water edge (m) 0.0 اران اداهاراه 1.5 3.0 4.5 6.0 7.5 9.0 Depth (m 0.0 1.3 2.5 1.7 1.0 0.4 0.0 At 0.2d 0.0 0.7 1.0 0.8 0.7 0.5 0.0 Velocity (m/s) At 0.8d 0.0 0.5 0.7 0.6 0.5 0.4 0.0

5. Estimate the discharge in the stream cross section shown below using the given data. Determine channel dimensions by scale. 8 Cross section Scale: Horiz. 1"-50" Vert. 1" 5' Station 2 3 4 4 Profile Scale: 1" 2' Velocity (ft/s) 0.75 1.91 5.21 4.78 1.34 5 8 6. A pitot tube is placed in a flowing channel, as shown below. Estimate the velocity measured by the pitot tube. Speculate on whether the measurement represents average velocity across the cross section. Determine dimensions by scale. Water level

A wide river with a water surface elevation 1/8000 of depth of flow D. If the depth of flow in the river is decreased by one third and the surface slope is decreased by 40%. If he ratio of the discharge is 2.58. Determine the percentage change in discharge. A 70.25% B-61.24% C 61.24% D -70.25%

Triangular notch with vertical angle of 90° measures a flow rate. If the value of Cd = 0.6 and there was an error of 2.5 mm in the measurement the head, then calculate the percentage error in estimation of discharge of 21 lit/s.