March 20, 2021
Water a precious resource
Key Learning Objectives
1.5 hours (Approximately)
Students will be able to explain need of water. Water is a useful natural resource. We humans are consuming water for different purposes at an alarming rate. If water usage is not regulated properly, then we might have to face water scarcity.
- Concepts to understand:
2.1 Water distribution on the earth
Water is an important natural resource. 71% if the earth’s surface is covered by water. The water is distributed as follows among all the water resources.
- 97% of water available on the earth is found in oceans. Only 3% is water available as fresh water.
- Of total water resource, 2.1% of water available is frozen in ice caps and glaciers, and 0.9 % of water available is found in ground water.
- Only 0.009% water is available as fresh water in lakes, pond, river, etc.
The following pie chart, represent the water distribution on earth’s surface.
2.2 Water cycle
We all know that water evaporates on heating and forms water vapour. Similarly, water evaporates from the surface of water resources like pond, ocean surface, river, lake, swamp, etc. Water also escapes trees in form of water vapour. This process is known as transpiration. The water vapour rises in the atmosphere. The higher the vapour rise it cools down and condenses to form small water droplets. These small water droplets collectively form clouds. As the amount of water droplets in the cloud increases, these droplets combine to form bigger water drops. These drops fall on the ground in form of rain. In cold region the water droplets freeze to form icicles. Thus, cold regions experience snow fall or hailstorm.
The rainwater seeps in the ground and gets collected in form of ground water. Ground water can be extracted by means of borewells, or wells. Rain increases the water level in ponds, lakes, river, etc. Thus, replenishing the water in water resources.
We use fresh water from these resources and use it for various activities like household use, industrial and agricultural purposes. The following image represents the water cycle.
2.3 Need for water conservation.
We know that only 0.009% of the total water available on the earth is used by humans for various purposes as follow:
- a) Household use: Fresh water is used for cooking, bathing, drinking washing utensils, washing clothes, cleaning purposes, etc. Fresh water is supplied to our home from municipal corporation. in some cities, households are provided with 24 hours supply. The amount of water used in such households is not regulated and it gets wasted frequently. Whereas in many villages and towns, fresh water is scarcely available, and they only get water for 15-20 minutes. In such places, people need to store waters for appropriate use and water wastage is near to zero or minimum.
- b) Industrial use: Fresh water provided to factories is used to produce various goods or used for cleaning purpose. For example, water used for dying clothes is mixed with chemicals and is unfit for any other use. Such water is then discarded to drainage system or released into fresh water and may lead to contamination of freshwater resource.
- c) Agricultural use: Water is used in farms for cultivation of crops. This water mixes with the chemical fertilisers used while farming and may seep into ground and mix with ground water, thus polluting ground water. Also, water used for cultivation of crops is lost due to evaporation. Thus, precious resource is wasted.
To avoid wastage of water, we need to conserve the water in many ways. Following are such ways to conserve water.
- Rainwater harvesting: In areas receiving ample rainfall, the rainwater is collected at the rooftops of commercial or residential buildings, filtered and then collected in underground tanks. This water can be used for various purposes like cleaning utensils, washing clothes, watering plants, household cleaning, etc. It can also be used to wash cars, or for dying clothes in factories.
- Modern methods of irrigation: Adopting to modern method of irrigation like drip irrigation reduces the over spillage of water in farms for crop cultivation and water is conserved.
- Regulated water usage: In cities where water supply is provided for 24 hours should be regulated and population should be encouraged to store water and use it judiciously so that we can share this precious resource with others in need.
- Groundwater recharge: The ground water being used for various purposes depletes the water table. If the ground water levels are not restored, then the ground water will soon deplete. To prevent ground water from exhausting, we can construct recharge wells where rainwater will get collected and gets filtered and then mixed with the ground water.
- Repurposing water by filtering and boiling: Household water obtained from cleaning clothes or bathing can be collected in a vessel, and can be repurposed by filtering, cleaning and boiling. This water can be used for various other purposes like washing vehicles. Thus, by repurposing the water, we can reduce the use of fresh water for industrial use.
- Desalination of seawater: Ocean water is salty, and we cannot use it directly for drinking or cooking purposes. It can also not be used for industrial as well as agricultural purposes. Thus, we need to remove the salt and the dissolved minerals from the oceanic water and filter it before using it. In desalination plants oceanic water and sea water is collected in a huge vessel and is boiled. The water vapour formed by evaporating water is then collected in other vessel and is condensed to form drinkable liquid water.
Due to unregulated water usage for household and industrial activities, people living in a town are facing water shortage. Activities like gardening and agriculture uses 25% of the daily water consumption. You need to develop a game where importance of water conservation is conveyed to the player by various stages.
Game Design Overview:
Imagine the player is a mayor of a small town where industries are prospering. The town receives water supply from a nearby lake and receives 70 mm of water annually. Due to excessive water usage households are facing water cut on weekly basis. You need to create awareness among the user for judicious use of water by various level of game.
How to Design the Game:
The first step is to identify where the water losses are occurring the most or where the water is being overused.
Once you have identified the highest amount of water being wasted. You will have to create an algorithm flowchart that only allows a limited amount of water required for a given purpose. If the water exceeds a certain amount, then it will lead to water wastage. Hence, it is important to only supply limited amount of water and the algorithm should be able to monitor the limit.
Recommended Water Consumption
Toilet Flushing (daily)
Washing clothes (weekly)
Washing House (daily)
Washing Utensils (daily)
If water exceeds by more than 5 litres, then the game will be over indicating that the mission of saving water has failed
If the processes are successful, then you are required to save atleast 20 litres of water every day. Once you have saved 100 litres of water, then the game will be successful. Additionally, note that 1 day time in real life can be equated to 2 mins in game time.
In between the game, there will be other emergency water requirements which you have to decide whether you have to use water or not. For example, watering plans, cleaning your shoes, washing your dog etc. You will have to judiciously decide and use water
You can also parallelly install rain harvester on rooftop of your home that will give you bonus water.
Learning Objective Based Evaluation (0-2)
Higher Order Thinking Skills
Learning Objective Based Evaluation Total Score
Higher Order Thinking Skills Total Score
Learning Objective Based Evaluation
1 point Questions:
Q1. Out of the water available on the earth, how much % of freshwater is available?
Q2. Which is the correct order of processes in the water cycle?
- Evaporation > Condensation > Collection > Precipitation
- Evaporation > Collection > Precipitation > Condensation
- Evaporation > Condensation > Precipitation > Collection
- Condensation > Evaporation > Precipitation > Collection
Q3. Which of the following methods can be used for conserving water in our day-to-day life?
- Rainwater harvesting
- Wastewater farming
- Regulated Water Use
- Desalination of Sea water
- All of the above
2 point Question:
Q4. If you are a consumer, how will you use water effectively?
- Judiciously use water by practicing limited water use with less wastage
- Judiciously use water by practicing unlimited water use
- By encouraging others to waste water
- Use more than 200 litres of water for bathing
Evaluation of HOTS (Higher Order Thinking Skills)
Identification of the Problem Statement:
Q5. What is the objective of the game that you have designed? (1 point)
Q6. Does the game designed solve the problem? Justify your answer. (1 point)
Solution of the Problem Statement:
Q7. How does the game designed address the problem? (1 point)
Q8. Can the solution be implemented in real life? Justify your answer (1 point)
Innovation in the Problem Statement:
Q9. What are the innovative aspects of the solution for which the game is designed? (2 points)
Creativity in the Game Design:
Q10. Describe and explain the unique design elements used in the game. (2 points)
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