SLIDE 1
Development of Water Quality Standards for Willard Spur
Steering Committee Update
Willard Spur Steering Committee August 16, 2011
Photo:Josh Noble
Monday, August 15, 2011
- Field tour
Steering Committee Update Willard Spur Steering Committee August - - PowerPoint PPT Presentation
Steering Committee Update Willard Spur Steering Committee August - - PowerPoint PPT Presentation
Development of Water Quality Standards for Willard Spur Steering Committee Update Willard Spur Steering Committee August 16, 2011 Photo:Josh Noble Monday, August 15, 2011 Field tour Monday, August 15, 2011 Reviewed background
SLIDE 2
SLIDE 3
Monday, August 15, 2011
- Reviewed background
– See memo
- Reviewed objectives and approach
- Reviewed sampling program
– Methods, challenges, path forward
- Discussed Willard Spur Dynamics
- Discussed data and format
SLIDE 4
Inflow from Tributaries
4200.5 4201 4201.5 4202 4202.5 4203 4203.5 4204 4204.5 4205 4205.5 4206 1000 2000 3000 4000 5000 6000 7000 Elevation (ft) Flow Rate (cfs) Bear River @Corinne Sum of BRMBR Outlets Willard Spur Water Level
Weber River inflow (>1000 cfs) Increase of 2.9ft Decrease of 2.5 ft
Source: http://waterdata.usgs.gov/nwis
SLIDE 5
Open or Closed Condition
- Bear River flows vs.
status of Willard Spur outlet
1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000
Jun-84 Mar-85 Dec-85 Sep-86 Jun-87 Mar-88 Dec-88 Sep-89 Jun-90 Mar-91 Dec-91 Sep-92 Jun-93 Mar-94 Dec-94 Sep-95 Jun-96 Mar-97 Dec-97 Sep-98 Jun-99 Mar-00 Dec-00 Sep-01 Jun-02 Mar-03 Dec-03 Sep-04 Jun-05 Mar-06 Dec-06 Sep-07 Jun-08 Mar-09
Discharge (cfs) YEAR
High GSL CLOSED CLOSED High GSL CLOSED CLOSED CLOSED CLOSED CLOSED CLOSED CLOSED CLOSED
2011 peak flow
??
Source: http://waterdata.usgs.gov/nwis USGS 10126000 BEAR RIVER NEAR CORINNE, UT Outlet status from satellite imagery
SLIDE 6
Tuesday, August 16
- Objective:
– What water quality standards are appropriately protective of beneficial uses
- f Willard Spur waters as they relate to the
proposed POTW discharge?
- Working Hypothesis for Critical
Condition
– Outfall reaches open water, open water is closed off from Bear River Bay
SLIDE 7
Conceptual Models
- Objective
– Link the pressures that create stressors to the responses that may impact the beneficial uses – Visualize these relationships from the cause to the impacted use
SLIDE 8
Tuesday, August 16
- Pressure/Cause – PWRWTP
discharge
- Stressors – Nutrients, changed
hydrology on mudflat
- Responses – macroalgae, phragmites
SLIDE 9
Simplified Nutrient Conceptual Model
Nutrient Load
Primary Response Altered Algal Community Increased Organic Decomposition Secondary Response Decreased SAV Density and Cover Low Dissolved Oxygen Impacts to Beneficial Uses Loss of Habitat Birds, Fisheries, Recreation
Altered Food Web
Birds, Fisheries, Recreation
Poor Water Quality
Recreation Decreased Light Availability
SLIDE 10
Simplified Hydrology Conceptual Model
Continuous Flows
Primary Response Wet soils Increased Vegetation Secondary Response Loss of beneficial vegetation due to invasives Impacts to Beneficial Uses Loss of Habitat Birds, Fisheries, Recreation
Altered Food Web
Birds, Fisheries, Recreation
Poor Water Quality
Recreation Habitat for Predators
SLIDE 11
Tuesday, August 16
- Beneficial Use Impacts
– Bird use and food web – Food web: fish, plants, macroinvertebrates
SLIDE 12
Studies
– Water budget – Nutrient budget
- Sediment/water exchange
- Nutrients/macroalgae
- Nutrient limitation
- Sediment burial
– Food budget – Bird diet & carrying capacity – Fish species/population
modeling
SLIDE 13
Path Forward
- Upcoming Science Panel meetings