The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by_______________?

Related Mcqs:

1. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If <j) index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is___________________?

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

2. The best unit duration of storm for a unit hydrograph is________________?

   A. 1 hour
   B. one-fourth of basin lag
   C. one-half of basin lag
   D. equal to basin lag

3. S-hydrograph is used to obtain unit hydrograph of________________?

   A. shorter duration from longer duration
   B. longer duration from shorter duration
   C. both (A) and (B)
   D. none of the above

4. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be__________________?

   A. 20 3/sec
   B. 25 m3/sec
   C. 30 m3/sec
   D. 35 m3/sec

5. The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of_________________?

   A. same duration only
   B. same and shorter duration
   C. same and longer duration
   D. any duration

6. Instantaneous unit hydrograph is a hydrograph of________________?

   1) unit duration
   2) unit rainfall excess
   3) infinitely small duration
   4) infinitely small rainfall excess
   The correct answer is?

   A. (1) and (2)
   B. (1)and(4)
   C. (2) and (3)
   D. (3) and (4)

7. The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD. curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be__________________?

   A. 100 mm
   B. more than 100 mm
   C. less than 100 mm
   D. none of the above

8. The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be___________________?

   A. 70mm
   B. 80mm
   C. 90 mm
   D. 105 mm

9. Unit of runoff in M.K.S. system is________________?

   A. cubic metre/sec
   B. metre/sec
   C. cubic metre
   D. square metre

10. The runoff increases with________________?

    A. increase in intensity of rain
    B. increase in infiltration capacity
    C. increase in permeability of soil
    D. all of the above