Bulletin 17C was released on March 29, 2018. Download the new guidelines here.

The Subcommittee on Hydrology of the Advisory Committee on Water Information has developed new Guidelines For Determining Flood Flow Frequency Bulletin 17C, an update to the previous Bulletin 17B that was published in March 1982. The new guidelines are available as a U.S. Geological Survey report.

This website provides access to the new document and supplementary materials that will be useful to analysts as they apply the new methods.

What is Bulletin 17C?

Flood Frequency Resources

Software

Frequently Asked Questions (FAQs)

Archive of Public Review Materials

If you have any questions regarding the Bulletin 17C public comment period please email: gs_b17c@usgs.gov.

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