Correct Option
The correct option isConstruction of percolation pits and trenches.
Explanation
Groundwater recharge is the hydrological process through which surface water moves downward to replenish aquifers. This process relies on the permeability of the ground surface and the retention time of water on the soil. Artificial recharge methods are employed to enhance natural infiltration rates, particularly in areas with high runoff.
Option Analysis
- Concretization of urban surfaces. is Incorrect: Concretization creates impermeable surfaces that prevent water from infiltrating the soil. This increases surface runoff and significantly reduces the volume of water reaching the water table.
- Construction of percolation pits and trenches. is Correct: Percolation pits and trenches are porous structures designed to capture rainwater and facilitate its slow seepage into the ground. These structures increase the contact time between water and soil, effectively recharging groundwater aquifers.
- Deforestation to reduce transpiration. is Incorrect: Although deforestation reduces transpiration, the removal of vegetation destabilizes soil structure and increases the velocity of surface runoff. This reduces the soil's water absorption capacity and leads to erosion, thereby hindering effective recharge.
- Diverting rainwater into sewage drains. is Incorrect: Diverting rainwater into sewage drains results in the loss of freshwater resources. It mixes clean rainwater with pollutants, preventing it from recharging the groundwater and increasing the load on sewage treatment infrastructure.
Key Takeaway: Effective groundwater recharge requires permeable surfaces and structures like percolation pits that allow water to infiltrate the soil, whereas impermeable surfaces and rapid runoff obstruct this process.