IOri!\ EPA REGION VI I

Transcription

1 "'""-'. w OR KI NG PAPER SERIES r f, S REPORT ON._-OKOPill I LAI<E DICKINSON COUNTY IOri!\ EPA REGION VI I CORVAIL IVIRONMENT AL I

2 ,L -"'-"", 7.,1,..::,x -, -'"' - :7 REPORT ON VEST OKOOOJ I LAKE,, DICKINSON munty IOWA EPA REGION VI WORKING PAPER No. 58 WITH THE COOPERATION OF THE IOWA DEPARTMENT OF ENvIRONMENTAL QUALITY AND THE IOWA r-la.tional GUARD

3 i CONTENTS Foreword list of Iowa Study lakes Lake and Drainage Area Map i i iv v Sections I. Introduction 1 I I. Conclusions I I I. lake Characteristics IV. lake Water Quality Summary v. Literature Reviewed VI. Appendices 9

4 i i FOREWORD The National Eutrophication Survey was initiated in 1972 in response to an Administration commitment to investigate the nationwide threat of accelerated eutrophication to freshwater lakes and reservoirs. OBJECTIVES The Survey was designed to develop, in conjunction with state environmental agencies, information on nutrient sources, concntrations, and impact on selected freshwater lakes as a basis for formulating comprehensive and coordinated national, regional, and state management practices relating to point-source discharge reduction and non-point source pollution abatement in lake watersheds. ANALYTIC APPROACH The mathematical and statistical procedures selected for the Survey's eutrophication analysis are based on related concepts that: a. A generalized representation or model relating sources, concentrations, and impacts can be constructed. b. By applying measurements of relevant parameters associated with lake degradation, the generalized model can be transformed into an operational representation of a lake, its drainage basin, and related nutrients. c. With such a transformation, an assessment of the potential for eutrophication control can be made. LAKE ANALYSIS In this report, the first stage of evaluation of lake and watershed data collected from the study lake and its drainage basin is documented. The report is formatted to provide state environmental agencies with specific information for basin planning [ 33(e)], water qulity criteria/standards review [ 33(c)], clean lakes [ 314(a,b)], and water quality monitoring [ lo6 and 35(b)] activities mandated by the Federal Water Pollution Control Act Amendments of 1972.

5 i i i Beyond the single lake analysis, broader based correlations between nutrient concentrations (and loading) and trophic condition are being made to advance the rationale and data base for refinement of nutrient water quality criteria for the Nation's freshwater lakes. Likewise, multivariate evaluations for the relationships between land use, nutrient export, and trophic condition, by lake class or use, are being developed to assist in the formulation of planning guidelines and policies by EPA and to augment plans implementation by the states. ACKNOWLEDGMENT The staff of the National Eutrophication Survey (Office of Research & Development, U. S. Environmental Protection Agency) expresses sincere appreciation to the Iowa Department of Environmental Quality for professional involvement, to the Iowa National Guard for conducting the tributary sampling phase of the Survey, and to those wastewater treatment plant operators who voluntarily provided effluent samples and flow data. The staff of the Water Quality Division of the Department of Environmental Quality provided invaluable lake documentation and counsel during the Survey, reviewed the preliminary reports, and provided critiques most useful in the preparation of this Working Paper series. Major General Joseph G. May, the Adjutant General of Iowa, and Project Officer Colonel Cleadeth P. Woods, who directed the volunteer efforts of the Iowa National Guardsmen, are also gratefully acknowledged for their assistance to the Survey.

6 ;1/ NATIONAL EUTROPHICATION SURVEY STUDY LAKES, STATE OF IOWA LAKE NAME Ahquabi Big Creek Reservoir Black Hawk Clear Darling Lost Island MacBride Prairie Rose Rathbun Reservoir Red Rock Reservoir Rock Creek Silver Spirit Viking West Okoboji COUNTY Warren Pol k Sac Cerro Gordo Washington Clay, Pal'o Alto Johnson Shelby Appanoose, Wayne Marion Jasper Worth Dickinson Montgomery Dickinson

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15 v. LITERATURE REVIEWED 8 Anonymous, Management plan for water quality -Iowa Great Lakes. Eugene A. Hickok and Associates, Wayzata, Minnesota. Bachmann, Roger W., and John R. Jones, Water quality in the Iowa Great Lakes. MS, Dept. Zoo. & Ent., IA St. U., Ames. Harrison, Harry M., Personal communication IA Cons. Comm., Des Moines. lake morphometry).

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