# Highway Engineering Questions and Answers – Hydrologic Analysis

This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Hydrologic Analysis”.

1. The design aspects of the surface drainage system are classified into how many types?
a) One
b) Two
c) Three
d) Four

Explanation: The design aspects are classified into hydrological and hydraulic analysis, these two are the important aspects of drainage system.

2. What is the objective of hydrological analysis?
a) Estimate maximum quantity of water
b) Design
c) Maintenance
d) Repair of CD structural defects

Explanation: The main aim of hydrological analysis is to estimate the maximum quantity of the water reaching the pavement.

3. The portion of water which flows on surface is called __________
a) Run off
b) Catchment
c) Percolated water
d) Storm water

Explanation: The portion of the water flowing on the surface after percolation into the ground and remaining on surface is called run off.

4. The factors not affecting run off is?
a) Intensity of soil
b) Type of soil
c) Topography of soil

Explanation: The run off is not afford by type of road, in national highway and state highway there may not be having more run off but they don’t affect the runoff.

5. The number of steps followed for surface drainage system is __________
a) One
b) Two
c) Three
d) Four

Explanation: The four steps include collection, finding the drainage, determine the run off and to estimate peak quantity.
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6. The rational formula is __________
a) Q=CiA
b) Q=ki
c) Q=AV
d) Q= CA

Explanation: The rational formula is given by Q=CiA where, Q is the run off, C is the run off coefficient and A is the area of the drainage.

7. The value of C is taken as ____ for bitumen pavements.
a) 1
b) 2
c) 0.9
d) 0.95

Explanation: The run off coefficient may be taken as 0.9 for bitumen and CC pavements, as in these pavements water is drained off very easily.

8. What is the minimum velocity required in drainage to maintain flow?
a) Self cleaning velocity
b) Sewage velocity
d) Maximum velocity

Explanation: The minimum velocity in which the water can flow with out any pressure is called as self cleaning velocity.

9. The area of the drainage is expressed in __________
a) 10 sq.km
b) 100 sq.km
c) 1000 sq.km
d) 10000 sq.km

Explanation: The drainage area is calculated for every 1000 sq.km for the drainage area present in the locality.

10. For a bitumen pavement calculate the discharge in m3/sec if intensity of the rainfall is 40 mm/sec and area of drainage is 100 m2.
a) 360
b) 36
c) 3.6
d) 0.36

Explanation: Q=CiA
Q=0.9*40*100
Q=3.6m3/sec.