For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is_______________?

Related Mcqs:

1. 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

2. A unit hydro graph has one unit of_______________?

   A. rainfall duration
   B. rainfall excess
   C. time base of direct runoff
   D. discharge

3. Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas. Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below ?

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are true but R is not the correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

4. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called________________?

   A. proportionality
   B. flexibility
   C. setting
   D. sensitivity

5. The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000) will be________________?

   A. V2 Q m3/sec
   B. 0.5 Q mVsec
   C. 2 Q m3/sec
   D. 4 Q m3/sec

6. 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

7. The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be________________?

   A. 50 mm
   B. 60 mm
   C. 90 mm
   D. 140 mm

8. To determine the discharge at a section in a stream from its rating curve, the required data are_______________?

   1) slope of water surface at the section
   2) stage at the section
   3) current meter readings at the section
   The correct answer is?

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

9. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that______________?

   A. demand cannot be met by inflow
   B. reservoir was not full at the beginning
   C. both (A) and (B)
   D. none of the above

10. 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