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Open-File Report 76-393

Prepared by the U.S. Geological Survey in cooperation with the Edwards Underground Water District, the Texas Water Development Board, and the city of San Antonio

Statistical Analysis of Water-Level Springflow, and Stream Data for the Edwards Aquifer in South-Central Texas

By Celso Puente

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Abstract

Water-level, springflow, and streamflow data were used to develop simple and multiple linear-regression equations for use in estimating water levels in wells and the flow of three major springs in the Edwards aquifer in the eastern San Antonio area. The equations provide daily, monthly, and annual estimates that compare very favorably with observed data.

Analyses of geologic and hydrologic data indicate that the water discharged by the major springs is supplied primarily by regional underflow from the west and southwest and by local recharge in the infiltration area in northern Bexar, Comal, and Hays Counties.

Posted August 2009

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Suggested citation:

Puente, Celso., 1976, Statistical analysis of water-level springflow, and stream data for the Edwards aquifer in south-central Texas: U.S. Geological Survey Open-File Report 76-393, 59 p.



Contents

Abstract

Introduction

Geology and hydrology of the area

Hydrologic data

Water levels

Springflow

Streamflow

Regression analyses of hydrologic data

Simple linear regression

Multiple linear regression

Use of the equations

Conclusions

Selected references



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