Technical Memorandum BCWA

Transcription

1 Technical Memorandum BCWA Date: February 8, 2017 To: Bear Creek Watershed Association From: Russell N. Clayshulte, Manager Re: BCWA TM BCR 2016 Summary Table 1 BCR Summary Statistics... 1 Table Summary Compared to Long-Term Trends... 3 Figure 1 Total Nitrogen BCR... 3 Figure 2 Total Phosphorus BCR... 3 Figure 3 Total Phosphorus Distribution within Water Column... 4 Figure 4 BCR Temperature... 4 Figure 5 BCR Specific Conductance... 4 Figure 6 BCR ph... 5 Figure 7 BCR Dissolved Oxygen... 5 Figure 8 BCR Temperature Compliance... 5 Figure 9 BCR Dissolved Oxygen Compliance... 6 Figure 10 BCR Total Phosphorus... 6 Figure 11 BCR Total Nitrogen... 6 Figure 12 BCR Chlorophyll-a... 7 Figure 13 BCR Secchi Depth... 7 Figure 14 BCR Carlson TSI... 7 Figure 15 BCR Total Phosphorus Pounds... 8 Figure 16 BCR Total Nitrogen Load... 8 Figure 17 BCR Estimated Inflow... 8 Table 1 BCR Summary Statistics Bear Creek Reservoir Summary Statistics Reservoir Growing Season July to September Reservoir Monitoring Parameters Reservoir Chlorophyll (Site 40) Average Growing Season Chlorophyll-a [ug/l (-1m)] 14.6 Average Annual Chlorophyll-a [ug/l (-1m)] 10.1 Peak Chlorophyll-a [ug/l] 23.9 Total Phosphorus Average Annual Total Phosphorus [ug/l]: Water Column 63 Average Annual Total Phosphorus [ug/l] -1m 39 Average Annual Total Phosphorus [ug/l] -10m 93 Growing Season Total Phosphorus [ug/l]: Water Column 95 Growing Season Total Phosphorus [ug/l]: -1m 57 Growing Season Total Phosphorus [ug/l]: -10m 134 Peak Annual Total Phosphorus [ug/l] Water Column 422

2 Total Nitrogen Average Annual Total Nitrogen [ug/l]: Water Column 784 Average Total Nitrogen [ug/l]: -1m 759 Average Total Nitrogen [ug/l]: -10m 799 Growing Season Total Nitrogen [ug/l]: Water Column 670 Growing Season Total Nitrogen [ug/l]: -1m 669 Growing Season Total Nitrogen [ug/l]: -10m 671 Clarity (All Profiles) Average Annual Sechhi Depth (meters) 1.22 Growing Season Average Secchi Depth (meters) 0.66 Dissolved Oxygen (site 40 Profile) Annual Average at -1/2m - 2m [mg/l] 8.56 Seasonal Average at -1/2-2m [mg/l] 6.80 Seasonal Minimum at -1/2-2m [mg/l] 4.62 ph Annual Average at -1/2m - 2m [mg/l] 8.18 Seasonal Average at -1/2-2m [mg/l] 8.10 Seasonal Maximum at -1/2-2m [mg/l] 8.91 Specific Conductance Annual Average at -1/2m - 2m [us/cm] 398 Seasonal Average at -1/2-2m [us/cm] 615 Seasonal Minimum at -1/2-2m [us/cm] 261 Phytoplankton Species Phytoplankton Co-dominant Species - Site 40 (July- October 2016) Aphanizomenon flosaquae Cladophora sp. Cryptomonas erosa Cymbella minuta Cymbella mexicana Diatoma vulgare Microcystis aeruginosa Melosira ambigua Melosira granulata Melosira varians Rhoicosphenia curvata Synedra ulna Peak Phytoplankton Aphanizomenon flos-aquae Density cells/ml = 29,006 Aphanizomenon flos-aquae Peak Biovolume (um 3 /ml) = 40,202,900 Loading - Annual Pounds Total Nitrogen -Total Load In to BCR 84,580 Total Nitrogen -Total Load From BCR 90,227 Total Nitrogen -Total Deposition into BCR -5,646 Total Phosphorus -Total Load In to BCR 5,657 Total Phosphorus -Total Load From BCR 4,369 Total Phosphorus -Total Deposition into BCR 1,288 Bear Creek Watershed Association Page 2

3 Bear Creek Watershed Association Page 3 Table Summary Compared to Long-Term Trends Parameter Mean Median Chlorophyll-a (ug/l) Top Total Nitrogen ug/l Top Bottom Water Column Total Phosphorus Top (ug/l) Bottom Water Column Secchi Depth (m) Top Total Nitrogen BCR Total Nitrogen ug/l 1, Figure Total Nitrogen BCR Bear Creek Reservoir Annual Average Total Phosphorus Trend 200 Total Phosphorus [ug/l] Figure 2 Total Phosphorus BCR

4 Total Phosphorus ug/l Bear Creek Watershed Association Page 4 Total Phosphorus Distributon In Water Column Reservoir Bottom Reservoir Top Figure 3 Total Phosphorus Distribution within Water Column BCR Temperature Average 1/2-2 Meters 0.00 J F M A M J J A S O N D Site 40 Central Pool Site 41- BC Outlet Site 42 - South Dam Figure 4 BCR Temperature BCR Specific Conductance Average 1/2-2 meters J F M A M J J A S O O N Site 40 Central Pool Site 41- BC Outlet Site 42 - South Dam Figure 5 BCR Specific Conductance

5 Bear Creek Watershed Association Page BCR ph Average 1/2-2 Meters J F M A M J J A S O N D Site 40 Central Pool Site 41- BC Outlet Site 42 - South Dam Figure 6 BCR ph BCR Dissolved Oxygen Average 1/2-2 Meters J F M A M J J A S O N D Site 40 Central Pool Site 41- BC Outlet Site 42 - South Dam Figure 7 Temperature C BCR Dissolved Oxygen BCR Temperature C (0.5-2m) Jan 5-Feb 5-Mar 5-Apr 5-May 5-Jun 5-Jul 5-Aug 5-Sep 5-Oct 5-Nov 5-Dec 23-5-Jan 22-Feb 7-Mar 25-Apr 20-Jun 11-Jul 25-Jul 9-Aug 22-Aug 12-Sep 26-Sep 17-Oct 17-Nov 5-Dec May site Site Site S(Jan-Mar) S(Apr-Dec) Figure 8 BCR Temperature Compliance

6 Dissolved Oxygen (mg/l) Bear Creek Watershed Association Page 6 DO Compliance Bear Creek Reservoir Site 40 Central Pool J F M A M J J A S O N D 5-Jan 22-Feb 7-Mar 25-Apr 23-May 20-Jun 11-Jul 25-Jul 9-Aug 22-Aug 12-Sep 26-Sep 17-Oct 17-Nov 5-Dec Average1/2-2m (mg/l) Profile Average (mg/l) DO Compliance (mg/l) Figure 9 BCR Dissolved Oxygen Compliance Figure 10 Figure 11 Phosphorus, ug/l BCR Water Column Average TP T Nitrogen, ug/l Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec BCR Total Phosphorus BCR Water Column Average TP BCR Total Nitrogen 2016 Bear Creek Reservoir Total Phosphorus Trends 2016 Bear Creek Reservoir Total Nitrogen Trends Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 Bear Creek Watershed Association Page Chlorophyll-a Bear Creek Reservoir Chlorophyll-a (ug/l) Figure 12 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec BCR Chlorophyll-a 0.0 Secchi Depth Bear Creek Reservoir Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Secchi Depth (feet) Figure 13 BCR Secchi Depth Carlson Seasonal Trophic Status Index [TSI] Figure 14 BCR Carlson TSI

8 Bear Creek Watershed Association Page 8 BCR Total Phosphorus Load (Pounds, %) Site 16a-Turkey Creek Inflow 2,142 38% Site 15a-Bear Creek Inflow 3,515 62% Figure 15 BCR Total Phosphorus Pounds Total Nitrogen Pounds Site 15a-Bear Creek Inflow, 55,441, 66% Site 16a-Turkey Creek Inflow, 29,140, 34% Figure 16 BCR Total Nitrogen Load BCR Estimated Inflow (acre-feet, %) Turkey Creek Inflow 11,936 30% Bear Creek Inflow 27,615 70% Figure 17 BCR Estimated Inflow