### Kingdom of Saudi Arabia

### Ministry of Higher Education

**Quiz **

### Majmaah University

### College of Engineering

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Academic Year:- 1434-1435 / 2013-2014 Term:- Odd

Level:-6 Civil Engineering

Subject:-Hydraulics-2

Time:- 45 Minutes

Max. Marks:10 (2.5x4=10)

Subject Code:- CE 241

**Answer any Four questions: **

**Question-1** Find the flow rate in a rectangular channel of 4.0 m wide and 2.0 m deep, if the bed slope is 0.0001 and roughness height is 0.02 mm.

**Question-2** A trapezoidal channel has side slope, 3 horizontal to 2 vertical the flow is 20m 3 /s at the bed slope 1in 3000. Design the channel for the best hydraulic form. Assume Manning constant n= 0.01

Question-3 water from a reservoir is discharged to atmosphere through a 10 cm diameter pipe

450m long. The entry from the reservoir to the pipe is sharp and the outlet is 12 m below the surface level in the reservoir. Taking f = 0.01, calculate the discharge.** **

Question-4 Water flows between two reservoirs trough a 30 cm diameter rough pipe for which f=0.025. if the difference of water surface elevation in the two reservoirs is 20 m. estimate the rate of flow and percentage loss due to form resistance (entrance and exit) if the pipe is 3000 m long.

**Question-5** Flow passes through a branched system of 2 parallel pipes as shown for which the following data are available:

Pipe

1

2

Diameter (m)

0.1

0.15

Length (m)

300

250

If the total flow is 0.4 m 3 /s. find the head loss across the branched system. f

0.024

0.022