you can build a river flood alarm working model with a riverside city and village concept, where the alarm activates when the water level rises to a dangerous level.
Materials Needed:
Cardboard & Color Paper (for city, village, river, and landscape)
Plastic Tray or Small Tank (to represent the river)
Water (to simulate flooding)
Metal Probes (Nails or Wires) (to detect water level)
9V Battery (to power the circuit)
Buzzer & LED Light (for alarm indication)
Float Switch or Conductive Wire Sensor (for automatic water level detection)
Glue, Scissors, Tape (for assembly)
Steps to Build:
1. Create the River & Surroundings
- Use a plastic tray or a shallow container to represent the river.
- Surround it with cardboard land areas, creating a city on one side and a village on the other.
- Use color paper to make houses, roads, and trees for a realistic look.
2. Install the Flood Detection System
- Place two metal probes (wires, nails, or aluminum foil strips) inside the river.
- Keep one probe at the normal water level and another at the danger level (higher up).
- Alternatively, use a float switch that triggers when water reaches a certain height.
3. Connect the Alarm Circuit
- Connect the higher-level probe to a 9V battery and buzzer circuit.
- When water rises and touches the upper probe, it completes the circuit, making the buzzer and LED light turn on.
4. Demonstration & Working
- Pour water into the river to simulate rainfall or flooding.
- As the water rises, it reaches the upper probe, triggering the buzzer and LED light.
- This warns the people in the city and village about the flood.