third truth: understanding how pollution reaches urban rivers
Through diffuse pollution. Rainwater flows through the surface of the city carrying the trash that our urban lifestyle produces. Municipality and citizens have to work together to stop trashing cities.
Due to poor structure. In some neighborhoods or cities, there is no sewage collection system, so citizens dump their sewage straight to creeks and rivers. In other cases, the Municipality collects the sewer, but it pours it in rivers by the lack of sewage treatment plants.
Due to clandestine connections. Some people choose to connect their sewage pipes straight to creeks and rivers, instead of making the connection in the municipal collection system, even knowing it is an illegal practice.