MP Board · Class 10 · Science · Sustainable Management of Natural ResourcesWhat is water harvesting? Explain the traditional water harvesting systems practiced in different parts of India and discuss their benefits in ensuring sustainable water management.

Introduction to Water Harvesting

\nWater harvesting is the activity of collection and storage of rainwater using techniques such as rainwater harvesting tanks, check dams, and percolation ponds. It is an ancient practice in India designed to cope with the erratic and seasonal nature of rainfall. Sustainable water management relies heavily on harvesting rainwater to recharge groundwater aquifers and meet domestic and agricultural needs.

1. Traditional Water Harvesting Systems in India

\nDifferent regions of India developed unique water management systems suited to their local geography and climate:

• Khadins, Tanks, and Nadis in Rajasthan:

  • Rajasthan receives scanty rainfall.
  • Systems like Khadins (a traditional method of water harvesting designed to harvest surface runoff water for agriculture) and Johads are widely used.
  • Embankments are built to hold rainwater, allowing it to percolate into the soil to nourish crops.

• Bundhis in Madhya Pradesh and Uttar Pradesh:

  • These are earthen embankments built across minor streams or slopes to store monsoon runoff.
  • The stored water slowly seeps into the ground to recharge groundwater levels.

• Ahars and Pynes in Bihar:

  • Ahars are traditional floodwater harvesting systems consisting of a catchment basin bounded by embankments.
  • Pynes are diversion channels led from rivers to collect water into ahars.

• Surangas in Karnataka and Kerala:

  • These are horizontal wells or tunnel wells dug into hill slopes to tap groundwater for drinking and irrigation purposes.

• Kulhs in Himachal Pradesh:

  • These are indigenous canal systems that channel glacial meltwater from streams to villages situated downhill.

2. Benefits of Traditional Water Harvesting Systems

• Groundwater Recharge: Water stored in structures like tanks and ponds gradually percolates into the ground, raising the water table and reviving dried-up wells.
• Drought Mitigation: These systems act as a buffer against droughts, ensuring a steady supply of drinking water and irrigation during dry spells.
• Ecological Balance: Unlike massive mega-dams, traditional systems do not cause displacement of people, loss of forests, or severe ecological destruction.
• Local Management: These structures are managed by local communities, ensuring high accountability, maintenance, and equitable distribution of water.

Conclusion

\nTraditional water harvesting systems represent a sustainable approach to resource management. Reviving these age-old techniques can solve modern water crises efficiently and ecologically.