FLOOD OF APRIL 1979 ON PEARL RIVER IN JACKSON, MISSISSIPPI AND VICINITY
by L.E. CarroonPrepared by the U.S. Geological Survey
1982
HYDROLOGIC INVESTIGATIONS ATLAS-655
CONTENTS
Introduction
Flood history
Flood frequency
Description of flood
Area inundated
Flood profiles
Acknowledgments
Additional information
Selected references
FIGURES
1. Peak discharge of annuals floods, Pearl River at Jackson, Mississippi, 1874, 1881, 1900-80
2. Peak gage height of annual floods above 15.0 foot gage height, Pearl River at Jackson, Mississippi, 1874, 1881, 1900, 1902-80
3. Frequency of floods, Pearl River at Jackson, Mississippi
4. Isohyetal map of total rainfall April 12-14, 1979
5. Water surface elevations, discharge, and precipitation at selected locations
6. Water-surface profiles of selected floods on Pearl River from Ross Barnett Dam to Byram-Florence Road
ABSTRACT
This atlas presents hydrologic information on the frequency, water-surface elevations, and areal extent of flooding along a 30-mile reach of the Pearl River from the Ross Barnett Reservoir (Madison and Rankin Counties) downstream to Byram, Hinds County, Mississippi. The principal city in the area is Jackson, Hinds County. This atlas provides a permanent re- cord of the flood of April 1979, which is the greatest flood since at least 1874. This information provides a technical basis on which to make flood-plain management decisions.
The areal extent of flooding was determined from aerial photo- graphs made April 17, 1979, very near the time of the flood crest, supplemented by aerial photographs made a day earlier at a stage 0.4 ft lower. Flood profiles were defined from field surveys of a number of points that have been monitored since about 1969 after each flood equal to or greater than 45,000 cubic feet per second, supplemented by many additional flood marks left by the 1979 flood.
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