It is required to estimate the amount of leak because of illegal connection thru a 30 cmØ pipe having f = 0.025. Two pressure gauges, 600m apart, installed upstream of the leak showed a difference in pressure of 140 kPa. Likewise, 2 pressure gauges 600 m apart downstream of the leak showed a pressure difference of 120 kPa. How much is the loss of H2O due to illegal connection?
Solution:
Determine the critical depth of a rectangular canal having a width of 6ft. which carries a discharge of 120 cfs.
Solution:
The PVC pipe is to be replaced by a sealed pipe. Its diameter is 95% of the old one with f = 2/3 also of the old pipe. Express the ratio of flow of the old pipe to the new one.
Solution:
Chemical that breakdown the unstable gas into two atoms of oxygen.
a) iron
b) chloride
c) nitrate
d) ozone
Answer:
A concrete spillway with permanent crest elevation at 40m. controls a reservoir having an area of 4 hectares. The length of the spillway if by removing flash boards water can be drawn from elevation 41.5 m. to elevation 40.5 m. in 24 minutes. C = 1.84.
Solution:
A concrete spillway with permanent crest elevation at 75m. controls a reservoir having an area of 5 hectares. The length of the spillway is 10.87m. How long will it take for the water to be drawn from elevation 76.5 m. to elevation 75.5m. if the flash boards are removed? C = 1.84.
Solution:
The ratio of volume of water to the volume of voids is known as:
a) moisture content
b) porosity
c) degree of saturation
d) none of these
Answer:
Hydraulic jump occurs from super-critical to
a) sub-critical
b) laminar
c) uniform
d) turbulent
Answer:
The results of a Standard Proctor Test is as follows:
Water Constant Weight (W) of moist soil
******% in Proctor Mold (grams)
******10 1.485
******12 1.606
******14 1.696
******16 1.755
******18 1.741
******20 1.651
The volume of the mold for this test is 1/30 cubic feet. Compute the value of maximum dry unit weight at optimum moisture content.
Solution:
The following data were obtained from a field density test on a compacted fill of sandy clay. Laboratory moisture density test on the fill material indicated a maximum dry density of 120 pcf at an optimum water content of 11 percent
Weight of moist soil removed from test hole = 1038 g
Weight of soil after oven drying = 914 g
Volume of test hole from rubber-balloon apparatus = 0.0169 cu.ft.
What was the percent compaction of the fill?
Solution:
A sample of uniform sand has a porosity of 43% and a water content of 12%. From laboratory tests emax = 0.85 and emin = 0.55. Assume Gs = 2.65. Compute the value of density index (Id).
Solution:
The natural water content of a saturated sample of clay is 400%. If the specific gravity of clay is 2.40, compute the porosity (n).
Solution:
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