owners, the watershed association undertook a project to restore the nine mile run stream in urban pittsburgh. schombert: the urban impacts on that watershed have been enormous. flooding flows, combined sewer overflows, gave it the nickname of "stink creek" for many, many years. hecht: before the stream restoration, when you have a rain event, the stream would just be barreling, just filled with tons and tons of water, and the water would move very quickly, eroding the stream banks further. narrator: the rushing water ran all the combined sewage straight into the monongahela river, which is a main supplier of drinking water for the region. hecht: what has happened because of the restoration is the water overflows its banks, it floods into these nice flood plains with native plants. and then slowly the water percolates back down into the stream. narrator: this allows the land to naturally filter and clean the sewer overflows before they enter the river. the restoration included extensive environmental changes to improve the stream and infrastructure changes to reduce the csos into the watershe

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urban areas across the country. baltimore lost about 30% of its population from 1970 to 2010, cleveland lost nearly 50% during the same time period, pittsburgh'sn about 41% since 1970 and more than half of the people living in youngstown, ohio, packed up and left over the last four decades. wes, i want to go to you first. i don't know if america knows but you have moved back to baltimore which is one of the great american cities but a city that has seen its fair share of problems and flight out of the city. i wonder, let's talk first why? why did you choose to go back to baltimore? >> you know, it was a question that even a lot of my friends asked me when i said i'm going back to baltimore, they were like why? honestly i believe in the baltimore story. i believe in the fact i'm a very proud baltimorens and we are proud people, proud of our city and have a lot of infrastructure that's in place that's actually showing where we're making a renaissance. if you look at school readiness indicators in baltimore, 12 years ago we were at 27% of kids were at school readiness now we have around 73% of kids at school readiness. new infrastructure coming b