the once mighty river rímac is now badly contaminated.l the state needs to play a more active role in getting things cleaned up. after a lot of to-ing and froing, we've managed to make an appointment with the head of a state-owned water utility. water is a political issue. during election campaigns, politicians like to pledge that they'll supply 100% of homes with water within 5 years. these are lies, because it's not that simple. how can i supply 100% of the population with water if there is simply no water? he says that the state needs to invest in more water treatment plants like this one. but so far, there's been no progress. back in valle escondido. abel cruz takes us to the hill where the nets are being set up. lima is surrounded by mountains like this, that are often shrouded in fog. the area is barren, sandy and rocky. and yet, according to estimates, some 150,000 people move here, year after year. driven by hopes of a better life. hopes that are usually dashed. locals are hard at work - with some very makeshift tools. a tin doubl