Questions & Answers: "Water Resources"

Proposal: Everyday Water Conservation

To conserve water, several key strategies can be implemented daily. At home, fixing leaks immediately and installing low-flow fixtures on taps and showers are essential. Practicing mindful habits, like turning off taps while brushing teeth and taking shorter showers, significantly reduces consumption. Reusing water from RO purifiers for cleaning or watering plants is also effective. For outdoor use, simple rooftop rainwater harvesting systems can collect monsoon runoff. This collected water can be utilized for gardening, washing vehicles, or cleaning common areas, reducing reliance on municipal supply. Community awareness campaigns are vital to educate residents on these impactful practices, fostering collective responsibility. By adopting these individual and collective measures, we can significantly decrease our water footprint, ensuring a sustainable water future for our community and promoting responsible resource management.

One of the most ingenious traditional irrigation methods is the system of Kuhls found in the hilly regions of Himachal Pradesh. A Kuhl is a diversion channel that taps water from a glacier or stream and carries it over long distances to irrigate fields in downstream villages. The system is managed by the community. A temporary headwall, often made of river boulders, is built across a stream to divert water into the channel. The community collectively maintains the Kuhl, clearing silt and repairing damages. This system is a remarkable example of community-managed, gravity-based irrigation that has sustained agriculture in mountainous terrain for centuries.

In recent times, heavy monsoon rainfall has caused devastating floods across various parts of India. States like Himachal Pradesh and Uttarakhand have witnessed catastrophic flash floods and landslides, where intense cloudbursts have caused rivers like the Beas and Alaknanda to swell dangerously, washing away roads, bridges, and homes. In the plains, states like Assam frequently experience widespread flooding from the Brahmaputra river, displacing millions and submerging vast tracts of agricultural land. Similarly, heavy downpours have led to urban flooding in major cities, highlighting the challenges of managing extreme weather events exacerbated by climate change and unplanned development.

India has several major inter-state water disputes over the sharing of river resources. Some of the most prominent ones include:

• Cauvery Water Dispute: Involving Karnataka, Tamil Nadu, Kerala, and Puducherry.
• Krishna Water Dispute: Involving Maharashtra, Karnataka, Telangana, and Andhra Pradesh.
• Ravi and Beas Water Dispute: Involving Punjab, Haryana, and Rajasthan.
• Mahanadi Water Dispute: Involving Odisha and Chhattisgarh.
• Mahadayi/Mandovi Water Dispute: Involving Goa, Karnataka, and Maharashtra.
• Vansadhara Water Dispute: Involving Odisha and Andhra Pradesh.

(Note: This answer is based on a typical urban locality like Nashik, Maharashtra, and should be adapted by the student.)

In and around my locality in Nashik, several rainwater harvesting systems are becoming common. The most prevalent system in modern apartment buildings is rooftop rainwater harvesting. Rainwater from the terrace is collected and channelled through pipes into a filtration tank and then stored in an underground sump. This collected water is primarily used for non-potable purposes like washing cars, cleaning common areas, and gardening. Additionally, many new constructions are incorporating recharge pits or borewells. These systems direct rooftop water into the ground to replenish the groundwater table, which is a crucial practice in a region that relies heavily on borewells.

Industries are a major source of water pollution. Many industries discharge untreated or inadequately treated effluents directly into rivers and streams. These effluents often contain a dangerous mix of chemicals, heavy metals like lead and mercury, detergents, and organic waste. The textile, chemical, and leather industries are particularly known for releasing toxic dyes and chemicals. Furthermore, thermal power plants release large quantities of hot water, which reduces the oxygen levels in water bodies, harming aquatic life. This industrial pollution not only makes the water unfit for human consumption but also destroys entire aquatic ecosystems.

Mistake: The statement incorrectly claims that urbanisation has led to proper water utilisation.

Corrected Statement: Multiplying urban centres with large and dense populations and urban lifestyles have led to the over-exploitation and misuse of water resources, causing depletion of groundwater and increased water scarcity.

Mistake: The statement falsely claims that dams do not affect a river's flow.

Corrected Statement: Regulating and damming of rivers significantly affects their natural flow and causes the sediment to settle at the bottom of the reservoir, leading to rockier stream beds and poorer habitats for aquatic life downstream.

Mistake: The statement incorrectly claims that rooftop rainwater harvesting is popular despite high water availability.

Corrected Statement: Today in Rajasthan, the practice of rooftop rainwater harvesting is on the decline as many households now depend on the perennial water supply from the Indira Gandhi Canal, even though some still prefer the taste of rainwater.

Water becomes a renewable resource through the hydrological cycle. The sun's heat causes evaporation from water bodies, which then condenses to form clouds and returns to the earth as precipitation (rain, snow), constantly renewing the supply.

Water scarcity is the lack of sufficient available water resources to meet the demands of a region. Its main causes are over-exploitation, excessive use, and unequal access among different social groups, often exacerbated by growing populations.

Advantages: Multi-purpose projects provide irrigation, electricity, flood control, and recreation.

Disadvantages: They cause large-scale displacement of people, deforestation, loss of biodiversity, and can trigger earthquakes and interstate water disputes.

In the semi-arid regions of Rajasthan, rainwater harvesting is a traditional and sophisticated practice. The most common method involves building underground tanks or 'tankas' for storing drinking water. These are large, circular pits connected to a sloping rooftop catchment area via pipes. The first spell of rain is often allowed to wash away, cleaning the roof and pipes. Subsequent rainwater is collected and stored in the 'tanka', which keeps the water cool and makes it a reliable source of drinking water until the next rainy season. In some areas like Jaisalmer, 'Khadins' are used for agriculture. These are long earthen embankments built across gentle slopes to harvest rainwater, which then saturates the soil for growing crops.

Modern adaptations of traditional rainwater harvesting are integrating age-old wisdom with new techniques to conserve water. In many urban areas, rooftop rainwater harvesting is being revived. Instead of just storing water in tanks, modern systems often direct the runoff into recharge pits or injection wells. This helps replenish depleted groundwater aquifers, a critical need in cities. In states like Karnataka and Tamil Nadu, it is now legally mandatory for new buildings to have rainwater harvesting structures. Communities are also reviving old water bodies like 'johads' (earthen check dams) and tanks, using modern engineering to improve their efficiency and storage capacity. These methods combine the traditional principle of capturing every drop with the modern goal of ensuring long-term water security.