A drainage canal in the shape of trapezoid with a bottom width of 2.5m. and sideslope of 1 horizontal to 1.732 vertical or 60° with the horizontal carries water at a depth of 3 m. Compute the discharge in m3/sec using Mannings formula. S = 0.0004, n = 0.015.
Solution:
A rectangular channel 7.5m. wide has 1.2m. deep of water flowing with a mean velocity of 0.75 m/sec., determine the height of a standard sharp crested weir that will increase the depth in the channel of approach to 1.8m. Use Francis formula, neglecting the velocity of approach.
Solution:
If the head over an 80° triangular weir is 0.30 m, what is the discharge if C = 0.60.
Solution:
A spillway 12.9m. long releases flood run off from a reservoir 5 hectares in area. The elevation of the crest of spillway is 53.5 m. Determine the time for the water level in the reservoir to drop from elevation 55m. to 54m. Use Francis Formula.
Solution:
Compute the surface run off for a watershed area of one fourth hectares if i = 4500/(t + 40) where i is the rainfall intensity in mm/hr and “t” in minutes when t = 50 minutes with coefficient C = 0.40.
Solution:
A cylindrical tank 4m. in diam and 10m. high contains 6m. of oil (sp.gr. = 0.9) and and 4m. of water. An orifice 100 mm diam. is located at the bottom with Cc = 0.90 and Cv = 0.98. Determine the total time to drain all the liquid.
Solution:
A cylindrical vessel 400mm in diameter and filled with water is rotated about its vertical axis with speed such that the water surface at a distance of 100mm from the vertical axis makes an angle of 45° with the horizontal. Find the speed of rotation rpm.
Solution:
Water flows thru a 600 mmØ pipe from reservoir A to B. The difference of water surfaces between the reservoir is 20m. If the minor losses constitute 10% of the major losses, what is the amount of the frictional losses?
Solution:
A 20 cm diameter solid cylinder of height 8cm is immersed in liquid with a density of 850 kg/m3 contained in a tall metal cylinder having a diameter of 24 cm. Before immersion the liquid was 12cm. deep. If the volume displaced is 900cm3. how deep is it submerged?
Solution:
Compute the critical depth of a rectangular channel 5m. wide with a rate of flow of 10 m3/sec.
Solution:
The percentage of volume of an object having a density of 950 kg/m3 submerged in water is:
Solution:
An open cylindrical tank contains 1.2m. of salt water (sp. gr. = 1.03), 0.80 m. of gasoline (sp. gr. = 0.70) and 1.0 m. of oil (sp. gr. = 0.85). What is the pressure 2.5m. below the liquid surface.
Solution:
What is the actual stress on a 2m. diameter cylinder, 5mm. thick, containing water under a head of 5m.
Solution:
What head is required for a trapezoidal weir 2.0 m. long whose sides make an angle of 75°57’50” with the horizontal, so that the measured flow is 2.66 m3/sec.
Solution:
A sluice gate if in the form of a circular arc of radius 6m. as shown in the figure. Calculate the magnitude of the resultant force on the gate.
Solution:
A sand layer of the cross-sectional area shown in the figure has been determined to exist for a 450m. length of the levee. The coefficient of permeability of sand layer is 3 m/day. Determine the quantity of water which flows into the ditch in m3/sec.
Solution:
Three kilo Newtons of water per second flow through the 200mm Ø pipe. Compute the flow rate in liters per second in the 200 mm Ø pipe.
Solution:
Civil Engineering Online Review
