Civil Engineering - Engineering Hydrology

Question - 1

A catchment has an area of 150 ha and a runoff/rainfall ratio of 0.40.If due to a 10 cm rainfall over the catchment a stream flow at the catchment outlet lasts for 10 h, the average stream flow in the period is

  • A 1.33 m3/s
  • B 16.7 m3/s
  • C 100 m3/min
  • D \(6\times { 10 }^{ 4 }{ m }^{ 3 }/h\)

Question - 2

By DAD analysis, the maximum average depth over an area of A km2 due yo one dat storm is found to be D cm.For the same area , the maximum avarage depth for a three day storm can expected to be

  • A <D cm
  • B >D cm
  • C =Dcm
  • D insufficient data

Question - 3

From isohyets maps study, at Roorkee a maximum rainfall depth of 250 mm in 12 h rainfall equal to or greater than 250 mm occuring at least Roorkee at least once in 50 yr is

  • A 0.99
  • B 0.64
  • C 0.61
  • D 0.34

Question - 4

The probability that a 100 yr flood is equalled or exceeded at once in 100 yr is

  • A 99%
  • B 64%
  • C 36%
  • D 1%

Question - 5

What is probable maximum precipitation?

  • A Projected precipitation for a all past recorded storm
  • B Maximum precipitation for all past recorded storm
  • C Upper limit of rainfall
  • D Effective precipitable water

Question - 6

Which one of the following defines Aridity Index(AI)?

  • A \(AI=\left( \frac { PET-AET }{ PET } \right) \times 100\)
  • B \(AI=\left( \frac { PET }{ AET } \right) \times 100\)
  • C \(AI=\left( \frac { AET }{ PET } \right) \times 100\)
  • D \(AI=\left( \frac { AET-PET }{ AET } \right) \times 100\)

Question - 7

The rainfall during three successive 2 h periods are 0.5 cm, 2.8 em and 1.6 cm. The surface runoff resulting from this storm is 3.2 cm. The  \(\phi \)index value of this storm

  • A 0.20 cm/h
  • B 0.28 cm/h
  • C 0.30 cm/h
  • D 0.80 cm/h

Question - 8

The total observed runoff volume during a 4h storm with a uniform intesity of 2.8 cm/h is \(25.2\times { 10 }^{ 6 }{ m }^{ 3 }\) from a basin of 280 km2 of area.What is the average infiltration rate for the basin?

  • A 3.6 nm/h
  • B 4.8 nm/h
  • C 5.2 nm/h
  • D 5.5 nm/h

Question - 9

A 6h storm has 6 cm of rainfall and the resulting runoff was 3 cm.If \(\phi \) index remains at the same value ,which one of the following is the runoff due to 12 cm of rainfall in 9h in the catchment?

  • A 4.5 cm
  • B 6.0.cm
  • C 7.5 cm
  • D 9.0 cm

Question - 10

A 3 h storm on a small drainage basin produced rainfall intensities of 3.5cm/h, 4.2 cm/h and 2.9 cm/h in successive hours.If the surface runoff due to the storm is 3 cm, then the value of \(\phi \)index will be?

  • A 2.212 cm/h
  • B 2.331 cm/h
  • C 2.412 cm/h
  • D 2.533 cm/h
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