This map shows where camps along the Guadalupe River were impacted by the July 4 flood. Meteorologists Pat Cavlin and Kim Castro detail how it all happened.

The risk of the catastrophic flooding that struck Texas Hill Country as people slept on July 4 and left at least 120 dead was potentially underestimated by federal authorities, according to an ABC News analysis of Federal Emergency Management Agency data, satellite imagery and risk modeling.

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.

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The deadly Texas floods have brought the state's approach to land approvals, especially in flood-prone areas, under more scrutiny.

NASA’s high-altitude WB-57 aircraft took off from Ellington Field Joint Reserve Base in Houston on Tuesday, and will conduct aerial surveys using its DyNAMITE (Day/Night Airborne Motion Imager for Terrestrial Environments) sensor.

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

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

Just days into his second term, President Donald Trump said he was going to recommend that the Federal Emergency Management Agency “go away,” dismissing the agency as bloated and ineffective. Kristi Noem,