Dog River Watershed Management Plan
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1 Dog River Watershed Management Plan Preliminary Water Quality Data Analysis Doug Robison, PWS ESA is where solutions and service meet.
2 Water Quality - Regulatory Primer Designated Use Categories Swimming and whole body water contact sports Fish and wildlife Water quality standards Numeric maximum or minimum concentrations for parameters of concern Total Maximum Daily Load (TMDL) program Established by the federal Clean Water Act 303(d) list = impaired water bodies TMDL = maximum amount of pollution a water body can assimilate and still meet standards TMDL s require pollutant load reductions
3 Dog River Watershed 95 square miles, urban watershed 15 named tributaries/segments: Alligator Bayou Perch Creek Robinson Bayou Rabbit Creek Rattlesnake Bayou Halls Mill Creek Milkhouse Creek Second Creek Spring Creek Moore Creek Eslava Creek Bolton Branch Woodcock Branch Montlimar Canal Michael Blvd. Canal Designated Uses: Lower Dog River: Swimming, Fish and Wildlife Upper Dog River and tributaries: Fish and Wildlife Source: University of South Alabama
4 Stakeholder Water Quality Concerns Trash Sediment Sewage Algae Source: Source: University of South Alabama Source: University of South Alabama
5 Eutrophication = nuisance & toxic algae Controlled by excessive nutrient concentrations Nitrogen Phosphorus Symptoms include: Phytoplankton blooms Low dissolved oxygen Algal mats Fish kills Odor Source: ESA
6 Dog River - Water Quality Parameters of Concern Dissolved oxygen Critical for health fish & shellfish populations Chlorophyll-a Measure of algal production Bacteria Indicator of human pathogens Heavy metals Accumulate in sediments & food chain Source: ESA
7 Data Sources Alabama Department of Environmental Management (ADEM)* Dog River Clearwater Revival (Volunteer) Mobile Bay National Estuary Program (MBNEP) U.S. Geological Survey (USGS) Geological Survey of Alabama *Used for current analysis
8 Water Quality Sampling Sites
9 Dog River Clearwater Revival 47 stations overall Only 2 sites appear to still be active (Dog River and Rattlesnake Bayou) In Situ Data Collection Dissolved Oxygen ph Salinity Secchi Depth Turbidity Temperature Turbidity Bacteria
10 Dog River Clearwater Revival First Sampling River Station N Last Sampling Date Date Alligator Bayou Feb May-08 Alligator Bayou Apr-03 8-Jun-05 Alligator Bayou Apr-03 8-Jun-05 Bolton Branch Feb Oct-10 Bolton Branch Aug-02 5-May-05 Dog River Jun-99 3-Oct-99 Dog River Mar Nov-09 Dog River Jun-99 7-May-00 Dog River Aug-99 8-Aug-99 Dog River Mar Jan-01 Dog River May May-02 Dog River Feb Oct-09 Dog River Aug Aug-01 Dog River Jul Feb-15 Dog River Apr Jun-10 Dog River Mar Sep-07 Dog River Jul Sep-11 Dog River - Robinson Bayou Nov-02 6-Sep-09 Eslava Creek Jan Oct-10 Eslava Creek Mar-09 7-Nov-09
11 ADEM Data Over 20 sampling sites in watershed Surface water grab samples at most Profile data collected at selected sites Nutrients, metals, bacteria, and in situ data Only 5 sites appear to still be active
12 ADEM Water Quality Stations River Station ID Station Name Count First Sampling Date Last Sampling Date Bolton Branch 3752 BOLM-2A Apr-07 4-Oct-11 Dog River 537 DGRM May Mar-15 Dog River 538 DGRM May Apr-02 Dog River 541 DR Mar Mar-15 Dog River Aug-07 9-Jan-08 Dog River May-07 9-Jan-08 Dog River May-07 9-Jan-08 Eslava Creek 4607 ESCM Mar-07 8-Jan-08 Eslava Creek 2401 ESLM Apr Oct-07 Eslava Creek 7350 ESLM Apr Mar-15 Halls Mill Creek 1042 HALM Mar Oct-06 Halls Mill Creek 1017 HALM May-06 4-Oct-11 Halls Mill Creek 2507 HMCM Mar Jan-08 Halls Mill Creek 7330 HMCM Apr-11 8-Apr-15 Moore Creek 4736 MCM Mar-07 9-Jan-08 Perch Creek 4808 PCM May Jan-08 Rabbit Creek 814 RBTM May Jan-08 Rabbit Creek 810 RBTM May-01 4-Oct-11 Rabbit Creek 811 RBTM May Mar-02 Rabbit Creek 812 RBTM May Mar-02 Rabbit Creek 7331 RBTM Apr-11 8-Apr-15 Rattlesnake Bayou 4858 RABM May Jan-08 Robinson Bayou 4874 ROBBM May-07 8-Jan-08
13 Existing Data Limitations Entry inconsistencies Units (µg/l vs mg/l) Sample fraction (dissolved vs total) Lack of sample depth data Often not specified Critical for dissolved oxygen standard Variable frequencies in parameter sampling Robust in situ dataset Limited chlorophyll-a in dataset
14 Dog River Watershed - Impaired Water Bodies Tributary/Segment Halls Mill Creek Bolton Branch Eslava Creek Rabbit Creek Dog River Impairments Siltation (303(d) list) Pathogens (approved TMDL) Pathogens (approved TMDL) Organic Enrichment (approved TMDL) Pathogens (approved TMDL) Organic Enrichment (approved TMDL) Pathogens (approved TMDL) Note: organic enrichment = eutrophication
15 Violations of the DO standard Dog River- Dissolved Oxygen
16 Estuarine Salinity Gradients
17 Salinity Stratification
18 Dissolved Oxygen Stratification
19 ADEM Eutrophication Standard It is generally accepted that chlorophyll-a concentrations in excess of 20 ppm promote eutrophication and facilitate severe diurnal dissolved oxygen fluctuations. ADEM, 2006 Exceedances at 6 sites Dog River Eslava Creek Halls Mill Creek Moore Creek Rabbit Creek More of a concern in the tidal segments Critical habitats for fish & shellfish
20 Bacteria Violations Violations of bacteria standards at 6 sites Dog River Eslava Creek Halls Mill Creek Moore Creek Rabbit Creek Fish & Wildlife Non-Coastal Coastal 2,507 max E-coli 275 max Enterococci Swimming & Whole Body Water Contact Sports Non-Coastal Coastal 126 max E-coli 104 max Enterococci
21 Mill Creek & Eslava Creek Bacteria
22 Sediment Quality Concerns Heavy metals Lead Cadmium Chromium Copper Zinc Potential causes Exhaust emissions Storm water runoff Anti-fouling & anti-corrosive components Source: ADEM 1994 and 1995
23 Water Quality Data Gaps Conduct Microbial Source Tracking (MST) study to identify potential bacteria sources and threats to human health Establish long-term monitoring sites in river reaches with identified water quality problems (e.g., Moore Creek) Maintain long-term monitoring sites in the lower Dog River to monitor health of the estuary
24 Water Quality Conclusions There is adequate existing data to generally characterize water quality status & trends Water quality conditions in the Dog River and its tributaries is generally poor Sediment Organic enrichment Bacteria TMDLs have been established by ADEM to begin addressing the major problems Improved storm water treatment and management is the most critical need
25 ? QUESTIONS?
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