Audio By Vocalize A man easen the flow of sewer lines along the streets of Kisumu on March 28 2018. [File, Standard] Nairobi Once again, the rain came, and with it a familiar disaster: Streets turned to rivers, homes were submerged, businesses were shuttered, and vital services ground to a halt. This is not the first time, and unless urgent changes are made, it will not be the last. Nairobi’s latest floods lay bare a hard truth: poor urban planning and overstretched infrastructure have turned seasonal rains into citywide emergencies that spare no one. The choice of Singapore as the…