# Statement (I): The trap efficiency of a reservoir increases with age as the reservoir capacity is reduced by sediment accumulation. Statement (II): The trap efficiency is a function of the ratio of reservoir capacity to the total inflow. A small reservoir on a large stream has a low trap efficiency.

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Updated on: September 25th, 2023

1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true (II) is true

The statement (I) is false but statement (II) is true. The ratio of total sediments held by a reservoir to the total amount of sediments entering a reservoir is known as the trap efficiency of a reservoir (inflow sediments).

### Factors affecting the trap efficiency

Reservoir Capacity or Sedimentation: The reservoir capacity and the sedimentation rate are inversely connected. The amount of sediment deposited will rise as time goes on even though the pace of silting or sediment deposition slows down, decreasing the reservoir’s capacity. Consequently, trap efficiency is also affected. Statement I is untrue.

Reservoir and stream sizes: A larger reservoir on a smaller stream has a lower capacity inflow ratio and, as a result, has a higher trap efficiency.

Stream flow velocity: Lower trap efficiency, and higher flow velocity results in less sediment accumulation.

Summary:

## Statement (I): The trap efficiency of a reservoir increases with age as the reservoir capacity is reduced by sediment accumulation. Statement (II): The trap efficiency is a function of the ratio of reservoir capacity to the total inflow. A small reservoir on a large stream has a low trap efficiency.

Although statement (I) is untrue, statement (II) is accurate. The relationship between reservoir capacity and total inflow determines a reservoir’s trap efficiency.

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