A boat makes it way past flooded property. A boat makes it way past flooded property after Hurricane Florence past through Wallace, North Carolina, on Friday, Sept. 21, 2018. (Photo: Alex Wroblewski/Bloomberg)

Flood insurance premiums could rise and property values fall in the most deluge-prone areas under a plan the Trump administration intends to roll out in coming weeks to change the way risk is calculated under the National Flood Insurance Program.

Use private-sector data to calculate flood threat for each home

Instead of simply focusing on whether a home is inside or outside of the 100-year flood plain, the Federal Emergency Management Agency plans to use private-sector data to calculate the real flood threat for each home and set costs based on that data, according to people familiar with the effort and a briefing document obtained by Bloomberg.

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