Question

Correct order, in decreasing trend, of principal components of India's water budget.

• A. Potential flow in rivers > Precipitation > Natural recharge > Evapotranspiration
• B. Precipitation > Evapotranspiration < Potential flow in rivers > Natural recharge
• C. Potential flow in rivers > Precipitation > Evapotranspiration > Natural recharge
• D. Precipitation > Potential flow in rivers > Evapotranspiration > Natural recharge

Hint:

Precipitation is always the biggest term, and only a small share of rainfall ends up recharging groundwater.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
We have to rank four terms of India's water balance, precipitation, evapotranspiration, potential flow in rivers, and natural recharge to groundwater, from the biggest quantity to the smallest.

Step 2: Key Formula or Approach:
Central Water Commission estimates put India's average annual precipitation at about 4000 billion cubic metres (BCM). Since every other term is only a share of this rainfall, precipitation has to sit at the top of the ranking.
Of this total, about 53 percent, close to 2131 BCM, goes back to the atmosphere as evapotranspiration from crops, soil, forests and water bodies.
A further part leaves as surface runoff into rivers, the potential flow in rivers term, worked out at about 1869 BCM, which is less than the evapotranspiration figure.
Only a small slice of the rain manages to soak in deep enough to add to groundwater. Natural recharge is placed at roughly 432 BCM, well below both of the terms above it.

Step 3: Detailed Explanation:
Putting the four numbers together: precipitation (about 4000 BCM) is largest since it is the source term everything else is drawn from.
Evapotranspiration (about 2131 BCM) comes next, because a mostly hot climate like India's sends more than half the rainfall straight back to the air.
Potential flow in rivers (about 1869 BCM) is third, this is the part of rainfall that runs off the land surface into streams without evaporating or infiltrating deeply.
Natural recharge (about 432 BCM) is smallest, since only a limited share of water percolates past the root zone to reach the water table.
This gives precipitation, then evapotranspiration, then potential flow in rivers, then natural recharge, which is option 2.
Options 1 and 3 wrongly put potential flow in rivers above precipitation, which cannot happen because river flow is only ever part of the rainfall and never bigger than it.
Option 4 swaps evapotranspiration and river flow, understating how much water India actually loses to evapotranspiration compared with surface runoff.

Step 4: Final Answer:
The correct decreasing order is precipitation, evapotranspiration, potential flow in rivers, natural recharge, matching option 2. The stray reversed arrow printed between evapotranspiration and potential flow in rivers in the source paper should be read as greater than for the chain to stay internally consistent, a known residual uncertainty from the scanned option text.