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Q: Why are floods common in rivers with headwaters in areas with cold snowy winters in spring?
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Why do lakes and rivers do not freeze suddenly in winters?

Lakes, and to a lesser degree, rivers, freeze as the ambient temperature reduces below Zero. This never happens "suddenly" and it takes time for the water to assume the surrounding temperature.


What is one physical feature that many of the largest cities have in common?

One physical feature that many of the largest cities have in common is that they are located on rivers. Rivers provide a food source, water, and a transportation route.


What are 3 types of floods in Australia?

Three major types of floods include: * Slow onset floods - these occur gradually after there has been significant rain in a catchment area. Often, towns have plenty of warning that such floods are coming, and have the time to create levee banks for protection. Charleville, in western Queensland, is prone to slow onset floods as the waters flow down the Warrego River from further upstream, where heavy rain has fallen. The water takes days or even weeks to go down. * Fast onset floods - these are also caused by heavy monsoonal rains, but water comes up more quickly, often trapping motorists trying to cross swollen rivers and isolating towns quickly, then just as quickly subsiding. * Flash floods - usually caused by thunderstorms and sudden downpours. these fill rivers and drains quickly, sweeping away people who try to cross. Flash floods subside very quickly.


How is a floodplain useful?

Some river floods bring nutrients to the flooded soil.


How does biosphere affect flooding?

floods can cause massive destruction to both environment and society Floods destroy drainage systems in cities, causing raw sewage to spill out into bodies of water. Also, in cases of severe floods, buildings can be significantly damaged and even destroyed. This can lead to catastrophic effects on the environment as many toxic materials such as paint, pesticide and gasoline can be released into the rivers, lakes, bays, and ocean, killing maritime life. Floods may also cause millions of dollars worth of damage to a city, both evicting people from their homes and ruining businesses. Floods cause significant amounts of erosion to coasts, leading to more frequent flooding if not repaired.However, floods do make a slight positive impact on the environment. Floods spread sediment containing beneficial nutrients to topsoil that might never arrive there otherwise.