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_________________?

Related Mcqs:

1. 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

2. 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

3. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to__________________?

   A. load factor
   B. plant factor
   C. utilisation factor
   D. both (A) and (B)

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. 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

10. The most suitable chemical which can be applied to the water surface for reducing evaporation is________________?

    A. methyl alcohol
    B. ethyl alcohol
    C. cetyl alcohol
    D. butyl alcohol