- INSTRUCTIONAL RESOURCES :
Ascertain students’ prior knowledge about different sources of water, volume and capacity, wastage of water in school, graphical representation of data.Facilitate students to share their knowledge and awareness via a group discussion about the misuse of water, storage of water and different designs to conserve water. Put forth questions like the ones given below:
- How water is misused at school, home, public places etc?
- How can you measure the capacity of a container having 3D geometrical shapes?
- Between a cylindrical container and a conical container having same base and same height whose volume is more?
- Which type of container will you construct to store more quantity of water?
- Why should we store water?
- What are the different sources of water?
- What could harvesting rainwater mean?
- How is rainwater harvesting beneficial?
- Divide the students into groups of 5. Distribute the KWHL Chart to the group members and ask them to fill it in.
- Ask the students to research on rainwater harvesting. You can showcase this video to give them an idea about the prototype of the rainwater harvesting structure (https://www.youtube.com/watch?v=cy7yYRlsmwA )
- ENGINEERING DESIGNING:
- Part- I:Planning for storage of collected rainwater-
Ask the students to design containers of various shapes (but same height and width) with the chart papers. Ask them to pour rice grains to sand in each container and see which one has the maximum capacity. Ask them to design a container based on this activity.
- Part-II : Constructing the rain water harvesting structures-
Encourage each group to distribute their work load evenly among the members for timely completion of the project.
The students and teams who need assistance can be guided with useful inputs which are available to you.
Inform the students that while constructing the structure they need to keep in mind:
- Which part of the school building can be the collection point of rain water?
- System needed to collect rain water
- Area within the school where collected rain water can be stored
- The location of conduits/pipes to take the water from the collection point to the storage area
- Length and width or height and radius of conduits and containers for holding maximum volume of water.
- Part-III : Testing and Re-designing-
Ask the students to present their models and test the volumes of structures by putting sand/rice grains or water into the containers.If the volume is not maximum then they will be instructed to redesign the structure by taking maximum base area and height.
- EXTENSIONS :
Students can be asked to design similar rainwater harvesting plans for the residential complex they stay in etc.