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HOUSTON, TX (CBSMiami) – Thousands of Houston residents have been forced leave their homes as rising flood waters inundate the city.

READ MORE: Residents Rescued After Surfside Condo Building Partially Collapsed

The nation’s fourth largest city is under water and it’s only going to get worse because forecasters say the slow moving Tropical Storm Harvey has at least two more days to go.

The Coast Guard spent Sunday pulling people off roofs in Houston as Harvey left many residents with no way to go but up to safety.

This Houston Fire Department captain was involved in more than 75 rescues on Monday.

And people on privately owned boats put their own safety at risk to try and save others.

Officials have urged people not to seek shelter in attics that don’t have any windows, but many have climbed up onto their roofs or hung signs.

The city’s 911 system has fielded 75,000 calls.

Thousands have left their homes and everything they owned behind.

“It’s all just materialistic stuff that’s always kept in your mind and it’s always going to be there so it’s good but it’s just hard,” said Tyler Robinson who was rescued from the flood water.

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Nerves are frayed at many of the cities shelters, where neighbors have little else but each other.

“They’re completely soaked,” said Nikki as tears welled up. “I don’t even know what to say, they’re not even my kids but I tell you what I love them like they’re my own. And I don’t know them from Adam.”

Nearly 30,000 people are expected to need shelter in the days and weeks ahead.

Harvey’s flood waters have left many cities and towns have been left almost unrecognizable. Initial predictions that storm’s worst would dump around 40-inches of rain in some areas, have been scrapped. That number is now 50 inches as Harvey is poised to still rain down for at least two more days.

Houston is the capital of the U.S. oil and gas industry. Flooding from Harvey has knocked out 15-percent of U.S. refining capacity and a quarter of production. Analysts say the storm will impact prices at the pump, possibly increasing them by five to 15-cents a gallon.

Four-thousand national and state guard troops are being brought in for relief and recovery efforts.

President Donald Trump said he will visit the region.

Many people across the country have asked how they can help. In response, the mayor of Houston has set up the Hurricane Harvey Relief Fund to accept tax-deductible flood relief donations.

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It’ll be run by the Greater Houston Community Foundation. For more information you can head to