Degree Type

Thesis

Date of Award

2008

Degree Name

Master of Science

Department

Geological and Atmospheric Sciences

Major

Environmental Science

First Advisor

William W. Simpkins

Second Advisor

Chris Harding

Third Advisor

Michael R. Burkart

Abstract

Ada Hayden Lake, a 49.6 ha, gravel-pit lake containing 5.2 million m 3 of water, comprises the emergency water supply for Ames, Iowa. This study characterized and quantified groundwater/lake interaction for the assessment of water supply potential. Hydraulic head, delta18O, delta 2H, and 3H data collected from 23 piezometers show that Ada Hayden Lake is a flow-through lake. Geochemistry is characterized by high P concentrations (SRP=93.6 mug/L), denitrification, and methanogenesis. A 3-D, finite-difference groundwater flow model shows that groundwater contributes 85 percent of the lake's water budget and approximately 42 percent of the soluble reactive P load. Model-simulated pumping of 106 gal/d from the lake during drought induces flow from the South Skunk River and lowers lake stage 3.6 m after 30 days. Pumping 1000 gpm in the aquifer for a year produces a drawdown of 3.75 m, induces flow from the lake, and lowers lake stage about 0.09 m.

DOI

https://doi.org/10.31274/rtd-180813-7423

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Evan Gary Christianson

Language

en

Proquest ID

AAI1455124

OCLC Number

263652313

ISBN

9780549589280

File Format

application/pdf

File Size

217 pages

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