New & Noteworthy

T&M Chapters
Stage, Discharge, & Levels

USGS WaterAlert

2009 Streamflow Summary

Threatened and Recently Discontinued Streamgages

Streamgaging Calendar

USGS in Your State

USGS Water Science Centers are located in each state.

Other Water Sites

Office of Ground Water

Office of Water Quality

Office of Hydrologic Research

Guidelines for Determining Flood Flow Frequency

• Guidelines for Determining Flood Flow Frequency (pdf = 28M)
  
  Bulletin 17B of the Hydrology Subcommittee
  Revised September 1981; Editorial Corrections March 1982
• References for above report

• Bulletin 17-B Flood Frequency Guidelines Frequently Asked Questions (Hydrology Subcommittee, Hydrologic Frequency Anslysis Work Group)

• PeakFQ User's Manual

• PeakFQ FactSheet

• PeakFQ Software