we find out as we catch a ride with a biologist. not all birds are chirpy. there are lagoon that is back up to the olympic village and park. you can see the garbage and the stench of open sewage. people staying nearby at the athletes village could take notice. they say the problem isn't new. the city has grown a lot in the last 50 years and sewage infrastructure didn't grow with it he says. today, all the rivers are contaminated. across the city the waterway that is host the sailing events face similar challenges. 49% of rio's homes are connected to sewage lines. government officials may not meet their target of hooking up 80% of homes before the games. on wednesday, ioc officials said they were confident water venues