Contextualization

Water is a fundamental component for life on Earth. In addition to its biological importance, it is crucial for agriculture, industry, energy generation, transportation, and other human uses. However, pollution, deforestation, climate change, and other human activities threaten the quality and availability of water.

Therefore, understanding how water flows over the Earth's surface (the so-called water cycle), how it is stored and filtered by nature (in rivers, lakes, underground aquifers, and springs), and how our actions can impact this dynamic is essential. In this sense, the analysis of watersheds and hydrographic networks and their interaction with the modeling of the Earth's surface allows us to understand the drainage pathways and the importance of vegetation cover in water conservation and filtration.

It is also important to discuss how urbanization has altered our relationship with water and the implications of this for water quality, the emergence of floods, the loss of aquatic biodiversity, and other challenges. The conservation of springs and natural reservoirs is vital to mitigate these problems and ensure that future generations can also enjoy this invaluable resource.

Practical Activity

Activity Title: Building a Watershed Model.

Project Objective:

This activity aims to provide students with a deeper understanding of the concept of a watershed, the water cycle, the importance of vegetation for water source conservation, and the impact of urbanization on water distribution.

Project Description:

Students will work in groups of 3 to 5 people to build a model representing a watershed. Each group will integrate different elements to demonstrate the water cycle, surface runoff processes, the importance of vegetation for water source conservation, and the impact of urbanization.

Required Materials:

• High-edged styrofoam tray
• Modeling clay or clay
• Colored water (just add food coloring to the water)
• Small plants or green scraps to represent vegetation
• Small blocks to represent urban constructions

Step-by-Step for Project Execution:

1. Each group will start by shaping the styrofoam to form the contours of a watershed with its hills and valleys.
2. Using clay or modeling clay, students should create the main river path and its tributaries along the valley.
3. The group should then add plants on top of the hills and along the river path to represent vegetation.
4. Next, they should add blocks to represent an urban center in the watershed.
5. Now, the group will simulate rain pouring colored water on top of the hills. They should observe how the water moves through the watershed, the paths it takes, how it interacts with vegetation, and with the city.
6. Finally, the group should discuss and write down their observations on how the rain moved, where the water accumulated, and what the impacts were on the urban area.

Project Delivery:

Each group must present their model to the class and share their observations. They should also document the project by writing a report that includes:

1. Introduction:

Students should write a contextualization on the theme 'Water Conservation' and the relevance of studying watersheds. They should also explain the objective of the practical activity.

2. Development:

Students should describe what the model represents, explain how they assembled it, and detail the processes they tried to simulate (water cycle, surface runoff, urbanization impact). Here, they should present their observations and discussions on what happened when it 'rained' on the model.

3. Conclusion:

Students should express what they learned from the practical activity, including how their results relate to the real world. They should answer: What did the activity teach about water conservation? What are the implications of what they observed for real life?

4. Bibliography:

Students should cite all sources they used to research the concepts involved and to help in creating their models.