Watershed Achievements Report
wq-cwp8-18
wq-cwp8-18
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Minnesota <strong>Watershed</strong> Red River Basin River <strong>Achievements</strong> Basin <strong>Report</strong> 2008<br />
<strong>Watershed</strong> <strong>Achievements</strong> <strong>Report</strong> Statewide<br />
2015<br />
Bois de Sioux <strong>Watershed</strong><br />
Bois de Sioux <strong>Watershed</strong> Nutrient Load<br />
Assessment<br />
Bois de Sioux <strong>Watershed</strong> with North Ottawa Drainage Basin<br />
The main purpose of this project is to monitor<br />
phosphorous nutrient loading at the North Ottawa<br />
Impoundment site in the Bois de Sioux <strong>Watershed</strong> and to<br />
assess the potential for the capture, removal and reuse<br />
of phosphorus from the watershed through aquatic plant<br />
management (primarily cattails) growing within Pool C<br />
of the impoundment. MPCA completed a pollutant load<br />
monitoring process between 2007 and 2009 to look at<br />
Minnesota watersheds and their contributions of TP and<br />
TSS. The Bois de Sioux <strong>Watershed</strong> is listed among the<br />
moderately high watersheds in the state with P yields<br />
ranging between .153- .377 lbs. /ac TP yield and 51-100<br />
lbs. /ac TSS yield.<br />
Historically, the International Water<br />
Institute (IWI) has been monitoring<br />
at sites upstream and downstream of<br />
the North Ottawa site to measure any<br />
positive effects that this site has on water<br />
quality. This project reviewed historical<br />
monitoring results as a reference to<br />
support loading and removal potential.<br />
The project timeline, May-September<br />
2014, allowed for summer sampling at<br />
targeted sites including the inlet, outlets<br />
and within the main retention pool<br />
(Pool C) in an attempt to gather baseline<br />
information as a reference for longer<br />
term monitoring. The project also included soil sampling<br />
and analysis work to collect baseline nutrient analysis<br />
within the three pools (A, B, C). Pools B and C within the<br />
impoundment are farmed unless there is a need to hold<br />
water beyond the capacity of Pool C.<br />
There is a need to understand watershed nutrient<br />
pathways and processes to help define a statistical range<br />
of input/output P and N for off channel flood storage<br />
sites. This information will lead and support best practices<br />
for managing existing sites and for planning and design<br />
across the watershed and where future impoundments<br />
will be constructed.<br />
Goals<br />
• Gather and review existing water quality data for<br />
project site.<br />
• Targeted monitoring of North Ottawa impoundment to<br />
measure nutrient loading.<br />
• Establish potential nutrient (phosphorus) removal<br />
potential through vegetation harvesting and removal.<br />
Results that count<br />
• Targeted monitoring at inlet and outlet of the<br />
impoundment from this project have yielded<br />
significantly different results when compared to<br />
historical data collected to measure water quality<br />
conditions and North Ottawa impoundment effects on<br />
water quality improvement.<br />
• Targeted monitoring of impoundment at inlet<br />
and outlets reflects the following reductions after<br />
treatment through the impoundment: P 38%, N 70%,<br />
TSS 84%.<br />
Pool C of the North Ottawa impoundment for the Bois de Sioux <strong>Watershed</strong><br />
Minnesota Pollution Control Agency www.pca.state.mn.us 95