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

If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be__________________?

A. 1 + (0.9)010
B. 1 – (0.9)°l0
C. 1/(1-0.9°10)
D. 1/(1+ 0.9010)

A unit hydro graph has one unit of_______________?

A. Rainfall duration
B. Rainfall excess
C. Time base of direct runoff
D. Discharge

For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is________________?

A. N/(m+l)
B. M/(n+l)
C. M/n
D. (n+l)/m

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

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_______________?

A. 0.2 x 106
B. 0.6 x 106
C. 2.4 xlo6
D. 7.2 xlo6

The shape of recession limb of a hydrograph depends upon________________?

A. Basin characteristics only
B. Storm characteristics only
C. Both (a) and (b)
D. None of the above

The flow-mass curve is graphical representation of__________________?

A. Cumulative discharge and time
B. Discharge and percentage probability of flow being equaled or exceeded
C. Cumulative discharge, volume and time in chronological order
D. Discharge and time in chronological order

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

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