Index To Evaluate Lake Restoration

by Donald B. Porcella, Principal Scientist; Tetra Tech, Inc., Lafayette, Calif.,
David P. Larsen, Research Aquatic Biologist; Corvallis Environmental Research Lab., United States Environmental Protection Agency, Corvallis, Oreg.,
Spencer A. Peterson, Research Aquatic Biologist; Corvallis Environmental Research Lab. United States Environmental Protection Agency, Corvallis, Oreg.,


Serial Information: Journal of the Environmental Engineering Division, 1980, Vol. 106, Issue 6, Pg. 1151-1169


Document Type: Journal Paper

Discussion: Jones R. A. (See full record)
Errata: (See full record)
Closure: (See full record)

Abstract: A lake evaluation index (LEI) is proposed to express the overall quality of lake water based on a mathematical combination of the commonly measured limnological variables total phosphorus (TP), total nitrogen (TN), chlorophyll (CA), Secchi depth (SD), dissolved oxygen (DO), and macrophyte coverage (PMAC). Values used in the LEI are averages for the July-August period. Epilimnetic zone concentrations of TP, TN, and CA are calculated. Macrophyte coverage is expressed as the percent of the area which could potentially be occupied actually. A term net DO is calculated by summing the absolute differences between observed and saturated DO for volume increments from surface to bottom, divided by the lake volume. The LEI was developed to express the overall change in water quality that might occur when lakes are restored and to evaluate the effectiveness of varoius treatment methods for a wide variety of lakes.

Subject Headings: Lakes | Ecological restoration | Water quality | Dissolved oxygen | Nitrogen | Mathematics | Phosphorus | North America | United States | California | Tennessee | South Dakota

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