Michael Pritchard Okay.

Tunnels leads to the sewers, sewers lead to the storm drains... Storm drains leads to sea.

They had pumps to keep the water out of the foundations.

The school drains the pool once a month.

Big structures often had drainage tunnels into the sewers in case of flooding down in the subbasements.

Some cities just release the water.

They literally flipped the switch.

Lately he'd been living in one of the downtown storm drains.

Looks like he was washed down the entire length of the runoff channel.

This is the city of San Francisco, which has 900 miles of sewer pipes under the city already, and it releases its waste water offshore.

I want a map covering the storm drain system in this area.

You can get a drainage grant these days.

We drain it and she'll fry.

Sewage treatment facility.

Its outer wall is solid rock but for a small culvert at its base which is little more than a drain.

Thanks, when we want your help, we'll get out the drain cleaner.

Under Los Angeles is a vast and intricate system of huge storm drains... built to siphon off the flash floods of the rainy season.

It has to substantially eliminate emissions of ammonia, nutrients, pathogens, heavy metals, odors, and have zero discharge of wastewater to ground or surface waters.

And then you had networks that developed.

Sewer rat!

Sewers.

The sewers?

I want a man at every other drain entrance along this line.

Now how many of you have ever gone to a state park or a national park where you had a big sign at the front saying,

So let me show you how the system works.

The waste water that leaks out is water that already now goes into that coastal environment, and the algae that leak out are biodegradable, and because they're living in waste water, they're fresh water algae, which means they can't

The dome has an incredible amount of water that washes off of it, as well as wastewater.

Fourteen people live in this place.

So different cities around the world treat their waste water differently.

It leaks. It's struck by lightning.

He'll head down this drain to where it comes out of the Rio Hondo.

It turns out, atrazine is the largest selling product for the largest chemical company in the world.

We know, because in the mid 19th century, wonderful Victorian engineers installed systems of sewers and wastewater treatment and the flush toilet, and disease dropped dramatically.

All drains lead to the ocean, kid.

Do they, perhaps, include green infrastructure, so that we can take runoff and water that's going out of our houses and clean it and filter it and grow urban street trees?

This is the old sewer.

125 for septic.

Water, water, water.

Well, what if we go to Madison Square Park, and we imagine it without all the cars, and bicycles instead and large forests, and streams instead of sewers and storm drains?

The waste systems all connect.

So, in fact, it's not permanently in the high seas.

Here's an image of what we could do in San Francisco Bay.

Yes, we are less prone to falling sick.

They were not related to her, but they tried to find out,

Don't worry. All drains lead to the ocean.