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Q5(c):
Write critical notes on the following:
(c) Groundwater depletion and ways for its replenishment
Solution :
1. Theoretical Foundations of Groundwater Depletion
Groundwater exists in subterranean aquifers—permeable rock or sediment layers saturated with water. Depletion occurs when the rate of extraction (via tube wells, boreholes, and commercial pumping) exceeds the natural rate of recharge (percolation of precipitation through soil layers). [Per the Hydrologic Cycle balance equation: $I - O = \Delta S$, where $I$ is Inflow, $O$ is Outflow, and $\Delta S$ is the change in aquifer storage].
2. Drivers of Depletion
- Agricultural Over-extraction: Intensive irrigation for water-intensive crops (e.g., paddy, sugarcane) in arid regions.
- Urbanization and Impermeable Surfaces: Concrete structures prevent natural infiltration, leading to surface runoff instead of aquifer recharge.
- Deforestation: Loss of vegetation reduces the soil's water-holding capacity and slows down infiltration rates.
- Climatic Variability: Erratic monsoon patterns lead to diminished soil moisture retention and reduced annual recharge.
3. Visual Representation of Groundwater Systems
4. Methodologies for Groundwater Replenishment
Replenishment strategies aim to artificially induce the infiltration of surface water into the underground reservoir.
| Technique | Mechanism |
|---|---|
| Rainwater Harvesting | Collecting runoff from rooftops and channeling it into percolation pits or recharge wells. |
| Check Dams | Constructing small barriers across streams to slow water flow, increasing residence time for soil infiltration. |
| Contour Bunding | Creating small embankments along the contours of a field to prevent runoff and encourage deep percolation. |
| Afforestation | Planting deep-rooted vegetation to enhance soil porosity and trap moisture. |
5. Ecological Consequences
Excessive depletion leads to Land Subsidence (the collapse of empty pore spaces in soil) and Saltwater Intrusion in coastal aquifers, where osmotic potential is altered, rendering water unfit for irrigation or human consumption. [Referencing the Darcy's Law: $Q = -KA(dh/dl)$, demonstrating that hydraulic head loss leads to a direct reduction in groundwater discharge capability].
Final Solution: Groundwater depletion is a critical anthropogenically-induced imbalance where extraction exceeds natural recharge. It must be addressed through a paradigm shift in water management, utilizing decentralized rainwater harvesting, reforestation, and mandatory artificial recharge structures in urban planning to restore the equilibrium of the hydraulic head within aquifers.
More Questions from Class 12 Biology Environmental Issues EXERCISES
- Q1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
- Q1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
- Q2: List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?
- Q2: List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?
- Q3: Discuss the causes and effects of global warming. What measures need to be taken to control global warming?
- Q3: Discuss the causes and effects of global warming. What measures need to be taken to control global warming?
- Q4: Match the items given in column A and B:
- Q4: Match the items given in column A and B: Column A Column B (a) Catalytic converter (i) Particulate matter (b) Electrostatic precipitator (ii) Carbon monoxide and nitrogen oxides (c) Earmuffs (iii) High noise level (d) Landfills (iv) Solid wastes
- Q5(a): Write critical notes on the following: (a) Eutrophication
- Q5(a): Write critical notes on the following: (a) Eutrophication
- Q5(b): Write critical notes on the following: (b) Biological magnification
- Q5(b): Write critical notes on the following: (b) Biological magnification
- Q5(c): Write critical notes on the following: (c) Groundwater depletion and ways for its replenishment
- Q6: Why does ozone hole form over Antarctica? How will enhanced ultraviolet radiation affect us?
- Q6: Why does ozone hole form over Antarctica? How will enhanced ultraviolet radiation affect us?
- Q7: Discuss the role of women and communities in protection and conservation of forests.
- Q7: Discuss the role of women and communities in protection and conservation of forests.
- Q8: What measures, as an individual, would you take to reduce environmental pollution?
- Q8: What measures, as an individual, would you take to reduce environmental pollution?
- Q9(a): Discuss briefly the following: (a) Radioactive wastes
- Q9(a): Discuss briefly the following: (a) Radioactive wastes
- Q9(b): Discuss briefly the following: (b) Defunct ships and e-wastes
- Q9(b): Discuss briefly the following: (b) Defunct ships and e-wastes
- Q9(c): Discuss briefly the following: (c) Municipal solid wastes
- Q9(c): Discuss briefly the following: (c) Municipal solid wastes
- Q10: What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
- Q10: What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
- Q11(a): Discuss briefly the following: (a) Greenhouse gases
- Q11(a): Discuss briefly the following: (a) Greenhouse gases
- Q11(b): Discuss briefly the following: (b) Catalytic converter
- Q11(b): Discuss briefly the following: (b) Catalytic converter
- Q11(c): Discuss briefly the following: (c) Ultraviolet B
- Q11(c): Discuss briefly the following: (c) Ultraviolet B
CBSE Solutions for Class 12 Biology Environmental Issues
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
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