Simulation of flood hydrographs for Georgia streams

Water-Resources Investigations Report 86-4004


  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Open Access Version: External Repository
  • Download citation as: RIS | Dublin Core


The O'Donnell method was used to compute unit hydrographs and lagtimes for 355 floods at 80 gaging stations in Georgia. An average unit hydrograph and an average lagtime were computed for each station. These average unit hydrographs were transformed to unit hydrographs having durations of one-fourth, one-third, one-half, and three-fourths lagtime, then reduced to dimensionless terms by dividing the time by lagtime and the discharge by peak discharge. Hydrographs were simulated for these 355 floods and their widths compared with the widths of the observed hydrographs at 50% and 75% of peak flow. The dimensionless hydrograph based on one-half lagtime duration provided the best fit of the observed data. Multiple-regression analysis was used to define relations between lagtime and certain physical basin characteristics. Drainage area and slope were significant for the rural stream equations and drainage area, slope, and impervious area were significant for the Atlanta urban-stream equation. A hydrograph can be simulated from the dimensionless hydrograph, the peak discharge of a specific recurrence interval, and the lagtime obtained from regression equations for any site with a < 500 sq mi drainage area in Georgia. For simulating hydrographs at sites with basins > 500 sq mi, the USGS computer model CONROUT can be used. (Author 's abstract)

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Simulation of flood hydrographs for Georgia streams
Series title Water-Resources Investigations Report
Series number 86-4004
DOI 10.3133/wri864004
Edition -
Year Published 1986
Language ENGLISH
Publisher U.S. Geological Survey,
Contributing office(s) South Atlantic Water Science Center
Description v, 41 p. :ill., maps ;28 cm.
Country United States
State Georgia
Google Analytic Metrics Metrics page