Guardian: Joshua Alvarez and his family fear for their lives when the monsoon rains come. Last August their two-bedroom flat in Manila was flooded when severe tropical storm Trami dumped 15 inches of rain (380mm) in a few hours and the local reservoir overflowed. They fled to a flyover with thousands of others as five large areas of the capital were inundated with muddy waters up to three metres deep and a state of calamity was declared in three Philippine provinces. In 2012, typhoon Haikui battered the megacity...