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Home My WebLink AboutSAC presentation - Shepherd - Chowan River Basin PlanDepartment of Environmental Quality Division of Water Resources Planning Section 2021 Chowan River Basin Water Resources Plan and Updates 2 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary ❑ Chapter 1: Basin Characteristics ❑ Chapter 2: Monitoring Data and Water Quality Assessment ❑ Chapter 3 and Chapter 4: Watershed Chapters (HUC 10) ❑ Chapter 5: Nutrient Sensitive Water Summary ❑ Chapter 6: Water Quality Initiatives and Funding ❑ Chapter 7: Permitted and Registered Activities ❑ Chapter 8: Water Use and Availability 3 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary •First coastal river in NC recognized with nutrient enrichment issues •Nutrient Sensitive Water supplemental classification (1979) •Nutrient Reduction Goals (1982) •Chowan River Basinwide Water Quality Management Plans (2002 and 2007) •Increasing bloom activity every year since 2015 Melody White – Summer 2019 4 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary ❑Nutrient Reduction Goals (1982): ❑30 to 40 % reduction in phosphorus inputs ❑15 to 25 % reduction in nitrogen inputs ❑Chlorophyll a peak levels not to exceed 40 µg/L ❑Summer mean (June-September) chlorophyll a concentrations below the 25-30 µg/L Chowan River dock on Old Ferry Rd, Rockyhock, 7/7/20 5 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary Station ID Parameters Frequency D0000050 D0010000 D0001800 D5000000 D6250000^ D8356200^ D8950000+^ D9490000^ Fecal, Turbidity DO, pH, Specific Conductance, Temperature, Salinity Monthly Nutrients* Chlorophyll a* Hardness Total Suspended Solids Quarterly D4150000/ D4151000 Same as above, but all surface samples Same as above * Photic Zone Sample + Phytoplankton ^Microcystin 6 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary Chowan River at Colerain (D8950000) Cell Density and Chlorophyll a concentration 200 0 200 1 200 2 200 3 200 4 200 5 200 6 200 7 200 8 200 9 201 0 201 1 201 2 201 3 201 4 201 5 201 6 201 7 201 8 201 9 202 0 Ph y t o p l a n k t o n C e l l D e n s i t y 0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 55000 60000 65000 70000 75000 80000 85000 90000 95000 100000200000300000400000500000600000 Ch l o r o p h y l l a ( µ g / L ) -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 100150200250300350 Cyanobacteria Cell Density Non-Cyanobacteria Cell Density Chl a µg/L 7 June 2015 Moderate Bloom 20,000-30,000 Severe Bloom 30,000-100,000 Extreme Bloom >100,000 8 Elizabeth City State University – Algae bloom on the Chowan River (8/12/19)Melody White – Summer 2019 Dolichospermum bloom, Chowan River (7/2/18) Chowan River near Colerain (7/13/20) Steve Chesson Bess Landing on Chowan River near Colerain (2019) Chowan River at Cannon’s Ferry (6/29/20) CEEG 9 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary ❑Nutrient Reduction Goals (1982): ❑30 to 40 % reduction in phosphorus inputs ❑15 to 25 % reduction in nitrogen inputs ❑Chlorophyll a peak levels not to exceed 40 µg/L ❑Summer mean (June-September) chlorophyll a concentrations below the 25-30 µg/L Chowan River dock on Old Ferry Rd, Rockyhock, 7/7/20 10 Chowan River Basin Water Resources Plan Temporal Pattern Nutrient Sensitive Water Summary 197 6 197 7 197 8 197 9 198 0 198 1 198 2 198 3 198 4 198 5 198 6 198 7 198 8 198 9 199 0 199 1 199 2 199 3 199 4 199 5 199 6 199 7 199 8 199 9 200 0 200 1 200 2 200 3 200 4 200 5 200 6 200 7 200 8 200 9 201 0 201 1 201 2 201 3 201 4 201 5 201 6 201 7 201 8 Su m m e r M e a n C h l o r o p h y l l a ( µ g / L ) 0 5 1015 20 25 30 35 40 4550 55 6065 70 75 80 85 90 95100200 210 220 No t t o w a y R i v e r F l o w ( c f s ) 0 500 1000 1500 2000 2500 3000 3500 D0010000 Riddicksville D6250000 Winton D8356200 Gatesville D8950000 Colerain D9490000 Edenhouse Nottoway River Flow *Summer mean (June-September) chlorophyll a concentrations below the 25-30 µg/L 11 Chowan River Basin Water Resources Plan Nutrient Sensitive Water Summary *Summer mean (June-September) chlorophyll a concentrations below the 25-30 µg/L Su m m e r M e a n C h l o r o p h y l l a ( u g / L ) 12 Chowan River Basin Water Resources Plan Spatial Pattern Nutrient Sensitive Water Summary D0010000 D8356200 D6250000 D8950000 D9490000 D0010000 D8356200 D6250000 D8950000 CHO0153A CHO0154A CHO0153A CHO0154A 1.6 – 2.0 2.1 – 3.0 3.1 – 9.0 9.1 – 14.0 14.1 – 15.0 15.1 – 23.3 Chlorophyll a 75th Percentile Concentration (ug/L) Data from 2014-2018 0% >0 – 7% 7 – 10% > 10% Percent Exceedance of Chlorophyll a Standard (>40 ug/L) Data from 2019-2022 0% >0 – 7% 7 – 10% > 10% Percent Exceedance of Chlorophyll a Standard (>40 ug/L) Data from 2014-2018 *All chlorophyll a samples collected between 2014-2018 D4150000 D5000000 D0000050 D0001800 D4150000 D5000000 D0000050 D0001800 D9490000 13 Chowan River Basin Water Resources Plan Spatial Pattern Nutrient Sensitive Water Summary 1.6 – 2.0 2.1 – 3.0 3.1 – 9.0 9.1 – 14.0 14.1 – 15.0 15.1 – 23.3 Chlorophyll a 75th Percentile Concentration (ug/L) Data from 2019-2022 D0010000 D8356200 D6250000 D8950000 D9490000 CHO0153A CHO0154A 0% >0 – 7% 7 – 10% > 10% Percent Exceedance of Chlorophyll a Standard (>40 ug/L) Data from 2019-2022 D8356200 D6250000 D8950000 CHO0153A CHO0154A D9490000 *All chlorophyll a samples collected between 2019-2022 D4150000 D5000000 D0000050 D0001800 D4150000 D5000000 D0000050 D0001800 D0010000 14 Chowan River Basin Water Resources Plan Longitudinal Pattern Nutrient Sensitive Water Summary 20 1 9 – 20 2 2 M e a n P a r a m e t e r V a l u e s Questions https://deq.nc.gov/about/divisions/water-resources/water-planning/basin-planning/water-resource- plans/chowan/chowan Forest Shepherd: forest.shepherd@deq.nc.gov 16 Chowan River Basin Water Resources Plan Nitrogen Nutrient Sensitive Water Summary 17 Chowan River Basin Water Resources Plan Nitrogen Nutrient Sensitive Water Summary 18 Chowan River Basin Water Resources Plan Nitrogen Nutrient Sensitive Water Summary