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| Title | Protocols for Determining the Mean Epilimnetic Total Phosphorus Concentration and Secchi Disc Depth in the Wapato Basin of Lake Chelan | |||
| Month-Year Published | May 1995 | |||
| Online Availability |
1214 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short Description |
Several water quality studies determined that Lake Chelan is one of the most pristine water bodies in North America due to low concentrations of nutrients and other pollutants. The goal of the Lake Chelan Water Quality Plan is to maintain the ultra-oligotrophic condition of Lake Chelan by protecting it from increasing population pressures. A 1989 water quality study of Lake Chelan resulted in a Total Maximum Daily Load (TMDL) which identified sources and estimated total phosphorus (TP) loads due to various land uses. The TMDL also set limits on each of those loads so that epilimnetic TP values would not exceed 4.5 ug/L. (Also see abstract below) | |||
| Publication Number | 95-e16 | |||
| Author(s) | Seiders, K., G. Pelletier, B. Ehinger, J. Rector, S. Lombard, and C. Kirchmer | |||
| Print Availability |
Not maintained in stock. Copy must be made from archive version.
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| Number of pages | 35 pp. | |||
| Keywords | county, lake, methods, order, phosphorus, protocol, quality, study, TMDL, Total Maximum Daily Load, water, water quality | |||
| Subject Waterbodies |
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| Abstract | Long Description |
Several water quality studies determined that Lake Chelan is one of the most pristine water bodies in North America due to low concentrations of nutrients and other pollutants. The goal of the Lake Chelan Water Quality Plan is to maintain the ultra-oligotrophic condition of Lake Chelan by protecting it from increasing population pressures. A 1989 water quality study of Lake Chelan resulted in a Total Maximum Daily Load (TMDL) which identified sources and estimated total phosphorus (TP) loads due to various land uses. The TMDL also set limits on each of those loads so that epilimnetic TP values would not exceed 4.5 ug/L. In 1994, Chelan County PUD1 received a grant to monitor TP and other constituents in Lake Chelan in order to determine if the water quality goal is being met. TP concentrations in Lake Chelan are currently near the detection limit of commonly used analytical methods. Careful sampling and analytical procedures are needed to determine TP concentrations in Lake Chelan. This document describes the methodology needed to estimate the mean TP concentration in the epilimnion of the Wapato Basin of Lake Chelan. A method for measuring Secchi disc depth in Lake Chelan for the purpose of observing and detecting long term trends in water clarity at low cost is also included. Each of these protocols meet Ecology's requirements for planning water quality monitoring activities. |
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This page last updated August 17, 2011
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