UN agencies have begun a joint assessment mission with the Government of Sri Lanka after record rains caused flash floods in parts of the capital, Colombo, and other areas on Thursday.The floods, which have affected several districts, have been caused by what is reportedly the heaviest rainfall in Colombo in 18 years.Over 1 Lakh 86 thousand people, the majority of them in Colombo, have been affected.The flooding has left tens of thousands of families homeless, disrupted traffic and submerged the country’s Parliament in four feet of water.