The floods in Pakistan began in late July 2010, resulting from heavy monsoon rains in the Khyber Pakhtunkhwa, Sindh, Punjab and, Balochistan regions of Pakistan, which affected the Indus River basin. Approximately one-fifth of Pakistan's total land area was affected by floods, with the Khyber Pakhtunkhwa province facing the brunt of the damage and casualties (above 90% of all the deaths occurred in the province). Nationwide, there were 1,985 deaths. According to Pakistani government data, the floods directly affected about 20 million people, mostly by destruction of property, livelihood and infrastructure. UN Secretary-General Ban Ki-moon had initially asked for US$460 million (€420 million) for emergency relief, noting that the flood was the worst disaster he had ever seen. Only 20% of the relief funds requested had been received on 15 August 2010. The U.N. had been concerned that aid was not arriving fast enough, and the World Health Organization reported that ten million people were forced to drink unsafe water. The Pakistani economy was harmed by extensive damage to infrastructure and crops. Damage to structures was estimated to exceed US$4 billion (€2.5 billion), and wheat crop damages were estimated to be over US$500 million (€425 million). Total economic impact may have been as much as US$43 billion (€35 billion). Causes The floods were driven by rain. The rainfall anomaly map published by NASA showed unusually intense monsoon rains attributed to La Niña. On 21 June, the Pakistan Meteorological Department cautioned that urban and flash flooding could occur from July to September in the north parts of the country. The same department recorded above-average rainfall in the months of July and August 2010 and monitored the flood wave progression. Discharge levels were comparable to those of the floods of 1988, 1995, and 1997. The monsoon rainfall of 2010 over the whole country was the highest since 1994 and the second highest during last 50 years. A research by Utah State University analyzed conditional instability, moisture flux, and circulation features and the results support a persistent increase in conditional instability during the July premonsoon phase, accompanied by increased frequency of heavy rainfall events. The increased convective activity during the premonsoon phase agrees with the projected increase in the intensity of heavy rainfall events over northern Pakistan. Large-scale circulation analysis reveals an upper-level cyclonic anomaly over and to the west of Pakistan–a feature empirically associated with weak monsoon. The analysis also suggests that