4. Determine the average monthly rainfall in 500 ha watershed based on the rainfall data for September of 5 rainfall gaging stations. The areas of the corresponding Thiessen Polygons are also indicated. Station Rainfall total Thiessen Polygon (September), mm area, ha 22 2190 1731 106 2040 75 D. 1560 203 1974 94 a. 1747 mm b. 17470 mm с. 1774 mm d. 17740 mm 5. If the probability that an annual rainfall of 3000 mm will be equaled or exceeded is 4%, the return period is а. 10 years b. 15 years с. 20 years d. 25 years

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Q: Hope your help hydraulic CEE 340

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A: since the given question is multiple type therefore as per guidelines only one question will be…

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.