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SAI INTERNATIONAL SCHOOL
                                                        Class-6

                                                   Lesson Notes
                                                  Subject-Physics
                                      Ch.- Water: The Life-giving Liquid
                         Subtopic- Water Conservation & Rainwater harvesting



               Water conservation: Saving water using it efficiently and reducing unnecessary
               wastage so that it is available for future use is called water conservation.
               Few simple actions we can do for water conservation are:
                      Water your lawn and garden in the morning or in the evening when outside
                       temperature is low to minimize evaporation.
                      Avoid flushing the toilet unnecessarily.
                      Don't let water run while shaving or washing your face, dishes and clothes.
                      Keep a bucket in the shower to catch water as it runs.
                      Collect water from your roof using a rainwater tank to water your garden.
                      Collect the water used for rinsing fruits and vegetable and then reuse it to
                       water houseplants.

               Dams:
                      Dam is constructed to hold back water and raise its level, forming a reservoir
                       behind it.
                      Floodgate of dams is used to manage or prevent water flow in specific land
                       regions.
                      Dams are also used to generate electricity.
                      Dams supply water to its surrounding when there is lack of rainfall and store
                       the excess water during heavy rainfall.


               Rainwater harvesting:
               Collection of rain water for using and reusing that for house hold purpose.
               Rainwater harvesting can be done by the following two ways:
                      Rooftop rainwater harvesting: this is the method of collecting rainwater from
                       the rooftop of a building through pipes into water tank.
                      This can be later filtered by simple methods for future use.
                      Pits or tanks: Pits and tank can be made in low lying areas to collect
                       rainwater. The water can be filtered and disinfected for consumption.
                      Rainwater harvesting is also used to replenish underground water.
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