A. 1 + (0.9)010
B. 1 – (0.9)°l0
C. 1/(1-0.9°10)
D. 1/(1+ 0.9010)
Related Mcqs:
- 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)10
B. 1 – (0.99)10
C. (0.9)’00
D. l-(0.9)100 - 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 - The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be__________________?
A. 50 cm
B. 55 cm
C. 56 cm
D. 60 cm - 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 - If the R.L’s of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be________________?
A. aqueduct
B. superpassage
C. syphon
D. syphon aqueduct - 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 - 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 - For a flood control reservoir, the effective storage is equal to_______________?
A. useful storage – valley storage
B. useful storage + surcharge storage
C. useful storage + surcharge storage + valley storage
D. useful storage + surcharge storage -valley storage - The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be_________________?
A. 637 hectares/m3/sec
B. 837 hectares/m3/sec
C. 972 hectares/m3/sec
D. 1172 hectares/m3/sec
