Lake Management Plan
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Questions? |
8.0.3 Totals and Average Loading by Watershed
Totals
Totals are approximated by averaging all the values. Data that is missing is not included. Storm events are included.
Average Totals Entering Pelican Lake |
|
2.26 |
Chlorophyll A ( lbs / day ) |
751.25 |
Total Suspended Solids ( lbs / day ) |
47,409,288,730 |
Fecal Coliform Bacteria ( Fecal Colonies / day ) |
13.27 |
Total Phosphorus ( lbs / day ) |
7.38 |
Ortho Phosphorus ( lbs / day ) |
57,912,060 |
Flow (GPD) |
Average Totals Exiting Pelican Lake |
|
1.57 |
Chlorophyll A ( lbs / day ) |
473.12 |
Total Suspended Solids ( lbs / day ) |
53,529,363,082 |
Fecal Coliform Bacteria ( Fecal Colonies / day ) |
8.22 |
Total Phosphorus ( lbs / day ) |
5.30 |
Ortho Phosphorus ( lbs / day ) |
53,827,313 |
Flow (GPD) |
Phosphorous
From observation of the total P loading the Pelican River is by far the highest contributor. This would priorities this stream for source identification. However concentration of TP is average compared to the other sites, and is nearly half of other area streams. This would suggest that heavy loading is due to the shear volume of water. See that the TP entering the lake is higher than the TP exiting. Most likely the lake is using the TP for normal aquatic growth. The site with the highest average TP concentration is Sherbrooke at 0.076 mg/L. The site with the lowest average TP is the Cormorant Lake outlet at .014 mg/L.
The Pelican River inlet is highest contributor of TP entering Pelican Lake with 9.07 lbs/day at Stroms Bridge , and 8.92 lbs/day at the Highway 20 culvert, but the Pelican River outlet carries 8.50 lbs/day of TP out of the lake. The smallest contributor of TP is Duck Lake with only 0.13 lbs/day.
Ortho Phosphorous
On average, approximately 55% of the total P entering Pelican Lake is OP. On some sites the OP is actually measured to be higher than the TP, such as the Burton Lake outlet. This is not possible. The cause of this is high concentrations of magnesium. See 1111 for more information.
The site with the highest concentration of OP is Spring Creek inlet at 0.032 mg/L, and the lowest is the Cormorant outlet at 0.01 mg/L.
Similar to TP, the Pelican River Inlet again is the highest loader of OP, at 5.44 lbs/day at Stroms Bridge , and 5.84 lbs/day at the Highway 20 culvert. The Pelican River outlet carries 7.88 lbs/day. The smallest contributor is Duck Lake at a mere 0.05 lbs/day.
Chlorophyll A
Average ChlA concentrations range between 0.002 and 0.019 mg/L. Primary loading occurs through the Pelican River inlet and outlet, with and average of 2.13 lbs/day at Stroms Bridge , 1.65 lbs/day at the Highway 20 culvert, and 1.71 lbs/day at the outlet. The smallest loading is Duck Lake at 0.03 lbs/day.
Total Suspended Solids
TSS averages around 1 to 3 mg/L per site and is evidence to the clarity of the Areas Rivers and streams. The Sherbrooke site is extremely higher than normal. This is most likely due to the rapids like nature of the stream as it enters the culvert.
Spring Creek at Sherbrooke is the highest loader of TSS at 970 lbs/day. Fortunately the wetlands between Sherbrooke and the outlet are absorbing TSS loading. 193 lbs/day enters Pelican Lake through the Spring Creek outlet, an 80% reduction from Sherbrooke .
Fecal Coliform
Spring Creek at Sherbrooke and the outlet have the highest average concentration of FC at 64 and 63 FC/100ml. Bob Creek inlet and Duck Lake are second at 33 and 36 FC/100ml. The site with the lowest concentration of FC is th4e Cormorant Outlet with an average of 2 FC/100ml.
The highest loader of FC is Spring Creek at 6.2 lbs/day at the inlet, and 5.7 lbs/day at Sherbrooke . The Pelican River outlet actually has a higher loading of FC at 10.9 lbs. The wetlands and pasture between the lake and the sampling site may be the cause of this.
The Bob Creek inlet has shown spikes in FC loading and concentration during storm events.
Flow
The Pelican River inlet accounts for nearly three quarters of the water entering Pelican Lake via streams at an approximate average of 70 cfs, or 44 million GPD. Duck Lake is nearly insignificant at 0.56 cfs or 360 thousand GPD.
