Environmental Engineering Reference
In-Depth Information
27. A trapezoidal channel is 4 ft wide at the bottom and 6 ft wide at the water
surface. The water depth is 40 in. If the flow velocity through the channel
is 130 ft/min, what is the flow rate through the channel in cubic feet per
m inute?
28. An 8-in.-diameter pipeline has water flowing at a velocity of 2.4 fps. What
is the flow rate through the pipeline in gallons per minute? Assume the pipe
is flowing full.
29. A pump discharges into a 3-ft-diameter container. If the water level in the
container rises 28 inches in 30 seconds, what is the flow into the container
in gallons per minute?
30. A 10-in.-diameter pipeline has water flowing at a velocity of 3.1 fps. What
is the flow rate through the pipeline, in gallons per minute, if the water is
flowing at a depth of 5 in.?
31. A channel has a rectangular cross-section. The channel is 6 ft wide with water
flowing to a depth of 2.6 ft. If the flow rate through the channel is 14,200
gpm, what is the velocity of the water in the channel in feet per second?
32. An 8-in.-diameter pipe flowing full delivers 584 gpm. What is the velocity
of flow in the pipeline in feet per second?
33. A special dye is used to estimate the velocity of flow in an interceptor line.
The dye is injected into the water at one pumping station and the travel
time to the first manhole 550 ft away is noted. The dye first appears at the
downstream manhole in 195 seconds. The dye continues to be visible until
the total elapsed time is 221 seconds. What is the velocity of flow through
the pipeline in feet per second?
34. The velocity in a 10-in.-diameter pipeline is 2.4 fps. If the 10-in. pipeline
flows into an 18-in.-diameter pipeline, what is the velocity in the 8-in. pipe-
line in feet per second?
35. A float travels 500 ft in a channel in 1 min, 32 sec. What is the estimated
velocity in the channel in feet per second?
36. The velocity in an 8-in.-diameter pipe is 3.2 fps. If the flow then travels
through a 10-in.-diameter section of pipeline, what is the velocity in the
10-in. pipeline in feet per second?
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