Water — Sources, Conservation and Water-Borne Diseases

Overview

Water is a fundamental topic in Environmental Studies for CG TET Paper I, connecting science concepts with everyday life experiences of primary school children. This topic carries significant weightage as it integrates multiple learning areas—natural resources, health, hygiene, and environmental awareness—all central to the EVS curriculum framework.

For the CG TET examination, candidates must understand not just the factual content about water sources and diseases, but also how to make these concepts meaningful for children aged 6–11 years. Chhattisgarh's geographical context—with major rivers like Mahanadi, Indravati, and Shivnath, along with tribal communities dependent on traditional water sources—provides rich local material that examiners frequently draw upon.

Mastery requires knowing the three main areas: where water comes from (sources), how we protect it (conservation), and what happens when water becomes unsafe (water-borne diseases). Questions often test application—how would you teach this concept, or what activity would demonstrate water conservation to Class III students?

Key Concepts

• **Water Cycle (Jal Chakra)**: Water continuously moves through evaporation → condensation → precipitation → collection. This explains why water never "runs out" globally but can become scarce locally.

• **Sources of Water**: Divided into surface sources (rivers, lakes, ponds, streams) and groundwater sources (wells, tubewells, springs). Rainwater is the primary source that replenishes both.

• **Potable vs Non-potable Water**: Only about 1% of Earth's water is drinkable freshwater. Children must learn to distinguish safe drinking water from water suitable only for other uses.

• **Water Conservation**: The practice of using water efficiently and preventing wastage. Involves both individual actions (closing taps) and community measures (rainwater harvesting, check dams).

• **Water-borne Diseases**: Illnesses transmitted through contaminated water containing pathogens—bacteria, viruses, or parasites. Prevention requires safe water and sanitation.

• **Traditional Water Management in Chhattisgarh**: Indigenous systems like village ponds (talab), stepped wells, and community water bodies that tribal communities have maintained for generations.

• **Interdependence**: Plants, animals, and humans all depend on water; polluting one water source affects the entire ecosystem and community.

Key Facts

| Category | Must-Remember Facts | |----------|-------------------| | Earth's Water | 97% saltwater in oceans; 2% frozen in glaciers; only 1% available freshwater | | Major Rivers of Chhattisgarh | Mahanadi (largest), Indravati, Shivnath, Hasdeo, Arpa | | Water Purification Methods | Boiling, chlorination, filtration, RO systems, SODIS (solar disinfection) | | Daily Water Requirement | Humans need 2–3 litres of drinking water per day | | Groundwater Indicator | Water table—the level below which ground is saturated with water | | Rainwater Harvesting | Collection and storage of rainwater for later use; reduces groundwater depletion | | Water-borne Disease Agents | Bacteria (cholera, typhoid), viruses (hepatitis A, polio), parasites (amoeba, giardia) | | Safe Water Storage | Covered containers, narrow-mouth vessels, regular cleaning prevents contamination |

Common Water-Borne Diseases

| Disease | Cause | Main Symptoms | Prevention | |---------|-------|---------------|------------| | Cholera | Vibrio cholerae bacteria | Severe watery diarrhoea, dehydration | Boiled water, sanitation | | Typhoid | Salmonella typhi bacteria | High fever, weakness, stomach pain | Clean water, vaccination | | Jaundice (Hepatitis A) | Hepatitis A virus | Yellow skin/eyes, fatigue | Safe water, hygiene | | Dysentery | Bacteria or amoeba | Bloody diarrhoea, cramps | Clean water, handwashing | | Polio | Poliovirus | Fever, paralysis | Vaccination, sanitation | | Diarrhoea | Various pathogens | Loose motions, dehydration | ORS, clean water |

Worked Examples

**Example 1: Identifying Water Sources**

*Question*: Raju's village has a river, a handpump, and a pond. Classify these as surface or groundwater sources.

*Solution*:

• River → Surface water source (water flows on Earth's surface)
• Handpump → Groundwater source (draws water from below ground)
• Pond → Surface water source (collected rainwater on surface)

**Example 2: Teaching Water Conservation**

*Question*: Which activity would best help Class III students understand water wastage?

*Solution*: Step 1: Identify age-appropriate, hands-on activity Step 2: Connect to children's daily experience Step 3: Best activity—Ask children to collect water dripping from a leaky tap for one hour, then measure it. Multiply by 24 hours to show daily wastage.

This works because: children observe directly, perform measurement (math integration), and calculate real impact.

**Example 3: Disease Prevention**

*Question*: After floods in a Chhattisgarh village, what water safety advice should be given?

*Solution*:

• Do not drink floodwater or well water directly (may be contaminated)
• Boil all drinking water for at least 10–15 minutes
• Use chlorine tablets if boiling not possible
• Store water in clean, covered containers
• Wash hands with soap before eating and after toilet use
• Report any cases of diarrhoea to health centre immediately

Common Mistakes

• **Confusing water scarcity with water absence** → Water scarcity means usable freshwater is limited, not that water doesn't exist. Earth has abundant water, but most is saline or frozen.

• **Thinking boiling removes all impurities** → Boiling kills germs but doesn't remove chemical pollutants, dissolved salts, or heavy metals. For chemical contamination, filtration is needed.

• **Believing groundwater is always pure** → Groundwater can be contaminated by sewage seepage, industrial waste, and excessive fertilizer use. It needs testing before assuming safety.

• **Teaching water cycle as linear process** → Students often draw it as a straight line. Emphasise it's a continuous cycle with no beginning or end—water molecules keep moving through the system.

• **Ignoring local context in pedagogy questions** → CG TET expects answers connecting to Chhattisgarh's rivers, tribal water practices, and local festivals like Hareli (which involves water and agriculture). Generic answers score lower.

• **Confusing ORS with medicine** → ORS (Oral Rehydration Solution) replaces lost fluids and salts during diarrhoea; it doesn't kill germs or cure the disease. It prevents dehydration while the body fights infection.

Quick Reference

• Three R's of water conservation: **Reduce, Reuse, Recycle**
• Boiling time for safe drinking water: **10–15 minutes at rolling boil**
• ORS formula (home-made): **6 teaspoons sugar + ½ teaspoon salt + 1 litre clean water**
• Chhattisgarh's lifeline river: **Mahanadi** (originates in Sihawa, Dhamtari)
• Best EVS approach for water topic: **Activity-based learning with local water body visits**
• Key prevention message: **Safe water + Clean hands + Proper sanitation = No water-borne disease**