CBSE Class 10 Science 2017 · Paper 31/1 · Question 18

(a) Any two ways, for example: 1. Put up posters and distribute pamphlets, and go door to door, with practical tips: turn off the tap while brushing, repair leaking taps and pipes, use a bucket instead of a shower or a running hose, and reuse water (for example, water left after washing vegetables) for plants. 2. Organise a street play (nukkad natak), a rally or a talk for the residents' welfare association, showing how water is wasted and how rooftop rainwater harvesting can be set up in the colony. (b) Rainwater harvesting: rainwater from rooftops and open ground is collected and led into recharge pits or wells (filled with sand, gravel and pebbles), check dams or ponds, from where it seeps into the ground and recharges the groundwater. Replenishing the groundwater in this way helps keep the water table from going down further.