how to make a simple working model of rainwater harvesting
for making rainwater harvesting model you need hard paper box you can cut that box as per video and make a small hour then color it as you like to make it beautyfull after this just add two small plastic box with pipe place one box on top and place one box in ground floor then connect both box with small pipe to run water top to ground after this add water on top floor water will come in pipe at ground floor box its whole rainwater harvesting model system make this model at your home or school see video to understand more.