USGS-derived 1-percent Annual Exceedance Probability Flood-Flow Estimates at Flood Insurance Study Locations Across Pennsylvania

One-percent annual exceedance probability (AEP) flood-flow estimates were computed at flood insurance study (FIS) locations across Pennsylvania using methods identified in Scientific Investigation Report (SIR) 2019-5094. Following guidance outlined in SIR 2016-5149, valid statistical reaches (VSRs) were identified for streamgages, which were used to assist with the determination of the applicable method used to compute a USGS-derived 1-percent AEP flood-flow estimate at an FIS location. Methods included: weighting, weighting and transferring, and regression equations. The USGS-derived 1-percent AEP flood-flow estimates were then compared to 1-percent AEP flood-flow estimates published in FIS's and furnished by the Federal Emergency Management Agency (FEMA).

Data and Resources

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modified 20220330
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publisher U.S. Geological Survey
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Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
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  • amerigeoss
  • annual-exceedance-probability
  • annual-peak-flow
  • basin-characteristics
  • bulletin-17b
  • bulletin-17c
  • ckan
  • expected-moments-algorithm
  • federal-emergency-management-agency
  • flood-flow-computation
  • flood-flow-estimate
  • flood-flow-frequency
  • flood-flow-regions
  • flood-insurance-study
  • geo
  • geoss
  • log-pearson-type-iii
  • lp3
  • national
  • north-america
  • pennsylvania-streamstats
  • period-of-record
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  • regression-analysis
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  • ungaged-stream-flood-estimates
  • united-states
  • updated-regression-equations
  • usgs-60367b40d34eb12031174c34
  • weighted-flood-flow-estimates
isopen False
license_id notspecified
license_title License not specified
maintainer Mitchell R Weaver
maintainer_email mweaver@usgs.gov
metadata_created 2025-11-20T11:26:15.537567
metadata_modified 2025-11-20T11:26:15.537572
notes One-percent annual exceedance probability (AEP) flood-flow estimates were computed at flood insurance study (FIS) locations across Pennsylvania using methods identified in Scientific Investigation Report (SIR) 2019-5094. Following guidance outlined in SIR 2016-5149, valid statistical reaches (VSRs) were identified for streamgages, which were used to assist with the determination of the applicable method used to compute a USGS-derived 1-percent AEP flood-flow estimate at an FIS location. Methods included: weighting, weighting and transferring, and regression equations. The USGS-derived 1-percent AEP flood-flow estimates were then compared to 1-percent AEP flood-flow estimates published in FIS's and furnished by the Federal Emergency Management Agency (FEMA).
num_resources 2
num_tags 31
title USGS-derived 1-percent Annual Exceedance Probability Flood-Flow Estimates at Flood Insurance Study Locations Across Pennsylvania