Evs ppt
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This document discusses drought, including its definition, types, causes, history in India, and effects. It notes that drought is a condition of acute water scarcity caused by significantly lower than average rainfall over an extended period. There are three main types of drought: meteorological, based on rainfall amounts; hydrological, based on water levels in supplies; and agricultural, referring to insufficient water for crop growth. Key causes discussed include low rainfall, soil erosion, global warming, and deforestation. The document outlines some of the most drought prone areas in India and provides a table showing drought years from 1801-2010.
Evs ppt
- 1. By: Pabba Sharath Subject: Environmental studies Roll no: 16011BB032
- 2. ThroughouT This presenTaTion you will learn
- 3. INTRODUCTI ON TO DROUGHT TYPES OF DROUGHT CAUSES OF DROUGHT HISTORY OF DROUGHT EFFECTS OF DROUGHT MITIGATION OF DROUGHT
- 4. □Look at the pictures and tell what you observe?
- 6. A lack or of for an unusually period of , involving less than the usual over 3 months A lack or shortage of water for an unusually long period of time, involving 50% less than the usual rainfall over 3 months DroughT is
- 7. The land is barren and covered in thin dust. Cracks appears in the earth’s. This is drought
- 8. DROUG HT What do you mean by drought? The word drought instantly brings image of dry, parched land, no rainfall, crop failures, starvation and bad living conditions to our mind. In simple terms, drought is a condition of acute scarcity of water, food, fodder, and employment due to scanty rainfall in an area.
- 9. ARe we All vUlneRAble TO DROUGHT? It is one of the most widespread disaster that India faces, affecting more than 70% of cultivable land. Often, people do not react to drought like they do to other sudden disasters such as earthquakes, cyclones, and floods. Since drought conditions develop over period of time, and without immediately perceptible changes to environment. Hence drought is called a ‘ slow on set’ disaster.
- 11. HOw A DROUGHT sTARTs A drought starts when total rainfall is well below average for several month s Other signs of drought include: ➢ Very dry soil ➢ Trees have a sign of dying ➢ Weather getting hotter and hotter Very dry soil
- 12. CAUsesOF DROUGHT Deficiency Of Rain Water Soil Erosion Global Warming Deforestation
- 13. HeRe’s THe eARTH
- 14. Ozone Layer
- 15. Hole
- 16. This has increased the average temperature and caused climate changes to the earths atmosphere and also causes drought.
- 17. Types of droughT There are 3 types of drought. They are as follows:
- 18. MeTeorological droughT Meteorological drought is generally defined by comparing the rainfall in a particular place and at a particular time. This happens when the actual rainfall in an area is significantly less than the climatological mean of that area. Meteorological drought leads to soil moisture and this always has an effect on crops production.
- 19. hydrological droughT Hydrological Drought is associated with the affect of low rainfalls on water level in reservoirs, rivers & lakes . This type of drought are noticed sometimes after a meteorology drought. A hydrological drought change in water level affects eco-system.
- 20. agriculTural droughT Agricultural drought occurs when there isn’t enough water for a crop to grow at the particular time. This type of drought doesn’t depend only in the amount of rainfalls where water is used carelessly for irrigation and other purpose.
- 21. hisTory of droughT PERIOD DROUGHT YEARS NUMBER OF DROUGHT 1801-1830 1801, 1804, 1806, 1812, 1819, 6 1825 1831-1860 1832, 1833, 1837, 1853, 1860 5 1861-1890 1862, 1866, 1868, 1873, 1877, 1883 6 1891-1920 1891, 1897, 1899, 1901, 1904, 1905, 1907, 1911, 1918, 1920 10 1921-1950 1939, 1941 2 1951-1980 1951, 1965, 1966, 1971, 1972, 1974, 1979 7 1981-2010 1982, 1987, 2002, 2009 4
- 22. Some of the areaS prone to drought Drought-in-Maharashtra: Marathwada region Aurangaba d Nanded Latur Jalna Beed Parbhani Osmanaba d Hingoli
- 25. Gujarat- Saurashtra Dead- Land-of-Rann of Kutch
- 27. Drought-in-Odisa