Multiple parts of Central Texas, including Kerr County, were shocked by flash floods Friday when the Guadalupe River and others rose rapidly.

A federally funded project at Rice University is trying to tackle that problem, but in just two counties so far.

The data also highlights critical risks in other areas along the Guadalupe River in Kerr County, revealing more than twice as many Americans live in flood prone areas than FEMA's maps show.

A flood watch is issued when conditions are favorable for flooding, according to the National Weather Service. It doesn't guarantee flooding will occur, but it means flooding is possible. Areas north of Dallas to the Red River will remain under flood watch until 7 a.m., according to the NWS in Fort Worth.

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Harvey inundated rivers, bayous, canals and highways in some of the most densely populated parts of the Houston metro area, which is home to 4.5 million people.

KPRC 2 FLOOD TRACKER: Get alerted if flooding is occurring in your immediate area Recommended Videos An aerial flood warning advisory has been issued for much of Harris County until about 11:45 a.m.

Crews from Houston, Galveston, Cypress Creek, Needham, New Waverly and North Montgomery County are in the Hill Country.

Texas has identified more than $50 billion in flood control needs, but lawmakers have devoted just $1.4 billion to address them