PGOLID

Pelican Group of Lakes Improvement District

Celebrating 25 Years

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You are here: Home / Programs / Lake Modeling

Lake Modeling

Lake_Segments_mapIntroduction
PGOLID has an extensive data set from its monitoring programs. The lake monitoring program was started in 1996, and has resulted in consistent data from 1996 to 2020. The stream monitoring program was started in 2001 and has resulted in consistent data from 2001 to 2020. This data was inputted to a BATHTUB computer model (US Army Corps of Engineers) to determine the proportion of phosphorus loading from different sources to the lake. These results can be used to implement programs to improve or maintain the water quality by addressing the phosphorus sources. Potential phosphorus sources include septic systems, shoreline runoff, precipitation, internal loading and inlet loading.

Results
The model output for each lake shows the percentage of phosphorus loading from each of the different sources (Figure 1). Little Pelican, Pelican, and Fish Lakes look somewhat similar because they have major inflows from the Pelican River. Overall, the largest source of phosphorus loading to the lakes is the inlets, especially the Pelican River. Septic systems and shoreline runoff are minimal in comparison to the inlets.

Bass Lake looks different from the other lakes because it is fairly isolated, with no major inlets. The connection between Bass and Fish Lakes does not appear to move much water back and forth, but there is undoubtedly some exchange (~11%). Therefore, the septic systems and shoreline runoff have a larger proportional impact in Bass Lake than the other PGOLID lakes (Figure 1).

Model
Figure 1. Phosphorus loading sources for the PGOLID lakes.

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QUESTIONS?

PGOLID Water Resource Coordinator
218-846-1465
pgolid@rmbel.info

MAILING ADDRESS

PGOLID
PO Box 336
Pelican Rapids, MN 56572-0336

WHERE WE ARE

The Pelican Group of Lakes is located in Otter Tail County, approximately 13 miles south of Detroit Lakes, and encompasses four lakes: Pelican, Little Pelican, Bass, and Fish.

WHO WE ARE

We are a lake improvement district, which means we are a taxing entity through the county. PGOLID was formed to identify, quantify, study, and manage water resources as to preserve quality.

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