of the next village, as these eris are interconnected. (ii) Ooranis: These are small ponds to collect rainwater. The water is used for various domestic purposes (drinking, washing and bathing). These ponds cater the nearby villages.
More to Know kallanai Dam, also known as Grand Anicut, is the fourth oldest dam in the world, constructed by King Karikala Chola of the Chola Dynasty in the nd century A.D.(CE). It still serves the people of Tamilnadu, The dam is located on the River Kaveri, approximately km from the city of Tiruchirapalli. Environmental Management Advantages of rainwater harvesting Rainwater harvesting helps to (i) Overcome the rapid depletion of ground water levels. (ii) To Meet the increase demand of water.
(iii) Reduces flood and soil erosion (iv) Water stored in ground is not contaminated by human and animal wastes and hence can be used for drinking purpose. . Electrical Energy Management Electricity or electric power is produced by generators. The generators are operated by the turbines attached to it.
The turbines are rotated by steam, moving water or wind power to produce electricity. Conservation of electrical energy The following measures can be taken even at home and school to save electricity (i) Use energy efficient appliances to save electricity like Compact Fluorescent Lamps (CFL), Light Emiting Diode (LED) bulbs and other electric equipments. (ii) Switch off the lights and fans, television and other electrical appliances when not in use. (iii) Switch of the mobile phone chargers when not in use.
(iv) Maximise the use of solar radiation. Solar water heating system can be used instead of electric geysers. (v) Minimise the use of air conditioners. .
E-Wastes and its Management E-wastes are generally called as electronic wastes , which includes the spoiled, outdated, non-repairable electrical and electronic devices. These wastes contain toxic metals like lead, cadmium, chromium and mercury, though also contain iron, copper, silicon, aluminum and gold which can be recovered. Neverthless, only % of e-wastes produced are recycled. Sources of e-wastes Electronic devices: Computers, laptops, mobile phones, printers, monitors, televisions, DVD