How do you make rainwater harvesting model for school project?

Answer 1

A model of a house, may be you can take a card board box and do some art work to covert that into the form of a house. Assuming a terrace building, make a parapet around the terrace portion (proportionately with small height). On one corner leave a small hole to connect a small pipe leading to a filter tank. Filter tank may be made of a small bottle, fill this with sand,pebbles and charcoal (sand at the bottom, pebbles above that and charcoal at the top - all these to be cleaned before putting inside the bottle). at the bottom of the bottle there must be a whole to be used as an outlet from the bottle. From this hole a pipe connected will take the water to a tank, where in you get the rain water collected (after filtering).