For a flood control reservoir, the effective storage is equal to_______________?

Related Mcqs:

1. The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after_________________?

   A. 50 years
   B. 150 years
   C. 200 years
   D. 250 years

2. The useful storage is the volume of water stored in the reservoir between________________?

   A. minimum pool level and maximum pool level
   B. minimum pool level and normal pool level
   C. normal pool level and maximum pool level
   D. river bed and minimum pool level

3. For wave action in dams, the maximum height of freeboard is generally taken to be equal to_______________?

   A. 0.5 hw
   B. 0.75 hw
   C. 1.25 hw
   D. 1.50 hw

   where hw is height of wave

4. A multipurpose reservoir is the one which is_________________?

   A. designed for one purpose but serves more than one purpose
   B. planned and constructed to serve various purposes
   C. both (A. and (B.
   D. none of the above

5. The water stored in the reservoir below the minimum pool level is called_______________?

   A. useful storage
   B. dead storage
   C. valley storage
   D. surcharge storage

6. Trap efficiency of a reservoir is a function of_______________?

   A. capacity/inflow ratio
   B. capacity/outflow ratio
   C. outflow/inflow ratio
   D. none of the above

7. When the reservoir is full, the maximum compressive force in a gravity dam is produced______________?

   A. at the toe
   B. at the heel
   C. within the middle third of base
   D. at centre of base

8. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

   1) Water pressure
   2) Self weight
   3) Uplift
   4) Pressure due to earthquake
   The correct answer is

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

9. 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

10. 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)