### 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