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More extreme climate means more heavy rains. Heavy rains can cause small or big floods. Murphy's Law (if something goes wrong more things can go wrong) is certainly applicable for floods. If heavy rains happen in a wide area simultaneously with high tide on sea and strong towards the coast winds (so that the rivers can't flow waters to the sea), than levies and dikes in some cases can not hold the weight of the risen water levels and elapse, flooding the dry lands behind the dikes. If the upstream water holding capacities are reduced by deforestation of mountains and hills and by this caused erosion, and rivers are canalized in more straight lines for transport reasons the downstream area gets water from four directions (upstream, downstream, sidestream and rain) and this multiples to risk of floods. Up stream floods are also caused by erosion caused by deforestation. High ocean tides are of all ages: they occur as the moon is in the same line seen from the earth, then the gravity forces of both join together on the earth, creating little more 'oval' shape of liquid surfaces of the earth (read: oceans) and creating high(er) tide, than the moon on its own does every day. When high ocean tides, storm, actual rains occur (and by former rains the inland water levels are already high by rain in earlier weeks) problems could disasters can occur. Floods destroy everything that they pass on their way. Floods cause huge economic disasters both for not insured people/companies, under insured people/companies and insurance companies. Floods always take also not small numbers of human lives. In August 2005 the hurricane Katrina has destroyed almost the complete city and suburbans of New Orleans, Louisiana causing huge loss of lives (over 1300 people) and tremendous economic damage. The State of Emergency is more than 2 years after Katrina still effective in New Orleans.

Author: Gijs Graafland

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