Capacity Inflow Ratio for a Reservoir

The capacity inflow ratio (CIR) is the ratio of the capacity of a reservoir to the inflow into the reservoir. It is an important parameter used in the design and management of reservoirs. The CIR can vary over time depending on various factors such as rainfall, evaporation, and water usage.

Decreases with Time

The correct option is B, which states that the CIR decreases with time. This is because as the water level in the reservoir rises, the capacity of the reservoir increases, and the CIR decreases. Conversely, as the water level in the reservoir decreases, the capacity of the reservoir decreases, and the CIR increases.

Factors Affecting CIR

There are several factors that can affect the CIR of a reservoir, including:

1. Rainfall: When there is heavy rainfall, the inflow into the reservoir increases, and the CIR decreases.

2. Evaporation: When there is high evaporation, the capacity of the reservoir decreases, and the CIR increases.

3. Water usage: When there is high water usage, the capacity of the reservoir decreases, and the CIR increases.

4. Seasonal variations: The CIR can vary over different seasons due to changes in rainfall, evaporation, and water usage.

Importance of CIR

The CIR is an important parameter used in the design and management of reservoirs. It is used to determine the size of the reservoir, the amount of water that can be stored, and the rate at which water can be released. The CIR is also used to predict the water level in the reservoir and to manage the inflow and outflow of water.

Conclusion

In conclusion, the capacity inflow ratio (CIR) for a reservoir is the ratio of the capacity of the reservoir to the inflow into the reservoir. The CIR can vary over time depending on factors such as rainfall, evaporation, and water usage. The correct option is B, which states that the CIR decreases with time as the water level in the reservoir rises.