The annual rainfall at station X and the average annual rainfall at 18 surrounding stations are given in table below. Check the consistency of the record at station X Determine the year in which a change in regime has occurred State how you are going to adjust the records for the change in regime Determine the average annual rainfall for the period from 1952 -1970 for the changed regime. Year 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 Station X 18-stations Ave 30.5 38.9 43.7 32.2 27.4 32 49.3 28.4 24.6 21.8 28.2 17.3 22.3 28.4 24.1 26.9 20.6 005 22.8 35.0 30.2 27.4 25.2 28.2 36.1 18.4 25.1 23.6 33.3 23.4 36.0 31.2 23.1 23.4 23.1 332

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Precipitation

Precipitation forms the basis of the water cycle on the Earth. The air is packed with water molecules in the form of moisture or water vapor. This water vapor usually rises to the atmosphere due to density differences. Precipitation represents any form of water, in liquid form or frozen form that forms in the earth's atmosphere. The water vapor up in the atmosphere condenses due to low temperature and it leads to the formation of clouds. The water vapor that forms clouds on account of condensation, is preferably known as cloud droplet. These cloud droplets when become heavy and can no longer sustain the weight of condensed water droplets, they come to the Earth in the form of rain, snow, ice pellets, and hail. Precipitation patterns, evaporation, and condensation are the three parameters that decide the global water cycle, climate change, and weather. Additionally, smoke and dust particles are equally important parameters for precipitation, as they provide the surface area for the water vapors to get condensed and to form water droplets. So they are known as condensation nuclei. The presence of other pollutants in the air also serves as condensation nuclei. Precipitation always results in the pure water supply to earth, as the salt from the seawater does not evaporate with the water.