MEAN ANNUAL RUNOFF IN THE EAST GULF COAST PLAIN OF MISSISSIPPI, 1939-85

by R.E. Southard

Prepared by the U.S. Geological Survey

1989

WATER RESOURCES INVESTIGATIONS REPORT 88-4079

CONTENTS

Abstract
Introduction
Mean annual runoff
Variation in runoff
Reference

FIGURES

1. Location of continuous-gaging stations and mean annual runoff

2. Mean annual precipitation in Mississippi for the base period 1951-80

3. Annual mean runoff for the 12 index stations

4. Minimum, mean, and maximum monthly runoff for the 12 index stations

TABLES

1. Continuous-gaging stations used to determine mean annual runoff

ABSTRACT

Mean annual runoff values or ranges in cubic feet per second per square mile of drainage area for streams draining the East Gulf Coastal Plain of Mississippi are shown in this map report. The map is based on runoff values at 62 continuous-record gaging stations computed for a common 47-year base period of October 1938 through September 1985. Mean annual runoff values at these stations ranged from 1.31 cubic feet per second per square mile in the central and north-central parts of the State to 2.02 cubic feet per second per square mile along the Gulf Coast. Mean annual runoff, which is useful in designing storage and flood-control im- poundments and in determining the quantity of water available for use from a stream or reservoir can be estimated at ungaged sites on streams by multiply- ing the runoff value from the map by the drainage area above the site. The part of Mississippi not included in this runoff map is the Mississippi River Alluvial Plain, where streamflow is affected by diversions, withdrawals, irrigation return flows and regulation.

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