ENVIRONMENTAL GEOLOGY OF THE BIG SPRING GROUNDWATER BASIN, NORTHEAST IOWA


R.D. Libra, G.R. Hallberg, R. D. Rowden, E.A. Bettis III, S.J. Kalkhoff, and D.G. Baker


Iowa Department of Natural Resources, Geological Survey Bureau,
Guidebook Series 15, 1992, 51 p.

TABLE OF CONTENTS


Introduction

Stratigraphic setting
Hydrologic setting
Landuse
Water quality monitoring

Stop 1: Chicken Ridge overlook
Stop 2: Roberts Creek quarry
Stop 3: Well nest BS-2
Stope 4: Sass Farm area
Stop 5: Bugenhagen sub-basin

Upper Bugenhagen monitoring sites
Lower Bugenhagen monitoring sites

Stop 6: Silver Creek sites
Stop 7: Holocend alluvial stratigraphy and vegetation history of Roberts Creek basin

Introduction
Stratigraphy, lithology, and paleoecology
Lithologic influences on the quality of shallow groundwater in small valleys

Stop 8: Big Spring

Monitoring system
Seasonal variations in hydrology and water quality
Anatomy of a recharge event
Results of long-term monitoring at Big Spring
Big Spring Basin Demonstration Project results

References