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A hydroelectric scheme operating under a head of 80 m will be classified as_____________? A. low head scheme B. medium head schemeC. high head scheme D. none of the above
The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by_____________? A. (0.99)10B. 1 – (0.99)10 C. (0.9)’00 D. l-(0.9)100
Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ? A. slope-area method B. area-velocity method C. moving boat method D. ultra-sonic method
The stream which does not have any base flow contribution is called________________? A. perennial stream B. intermittent streamC. ephemeral stream D. none of the above
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)°l0C. 1/(1-0.9°10) D. 1/(1+ 0.9010)
A unit hydro graph has one unit of_______________? A. rainfall durationB. 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/ND. (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/secB. 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