Flood-plain hydrology is primarily concerned with floodflow rates and with the depths and areal extent of inundation associated with floods of specific recurrence intervals. Factors that may cause flood characteristics to change are important. The technical procedures used to calculate flood frequency and magnitude depend on basic data, principaly reords of steam flow. The main source of observed data is the U.S. Geological Survey's gaging station network. A typical gaging station, modern gages, and measurements of discharge are briefly outlined. The length of record is a prime factor in flood-frequency analysis. Long-term flood-frequency characteristics of a small stream are discussed. Two approaches to flood magnitude and frequency computation for ungaged or inadequately gaged sites are: regression analysis; and unit hydrographs and statistically derived design rainstroms. Comments are also made on the modification of flood characteristics by man, flood-plain use, and water- surface profiles of 100-year flood events.

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00138119
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 6 1976 12:00AM