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Background on Water Quality Models for the Truckee River WQS Review Process November 2, 2011 Laura Weintraub, Dave Dilks.

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Presentation on theme: "Background on Water Quality Models for the Truckee River WQS Review Process November 2, 2011 Laura Weintraub, Dave Dilks."— Presentation transcript:

1 Background on Water Quality Models for the Truckee River WQS Review Process November 2, 2011 Laura Weintraub, Dave Dilks

2 Overview Water Quality modeling to support the WQS (water quality standards) review process Watershed model: –WARMF development and calibration River water quality model: –TRHSPF development and calibration Overview of model updates Intended use of the models 2

3 Need for Water Quality Modeling in WQS Review Process 3

4 Conceptual Watershed/Water Quality Model 4

5 Model Linkage – Observed Conditions Watershed Model Water Quantity Water Quality Model Land Use Climate Soil Types Management Practices Reservoir Releases Water Quality Pollutant Loads WWTPs WARMFTRHSPF 5

6 Model Calibration Process Certain model parameters cannot be directly measured, and must be indirectly estimated by finding which values allow the model to best describe the observed data –Process is called model calibration Calibration guidelines –Keep calibration parameters within reasonable range –No single objective measure of model calibration 6

7 Compliance with Dissolved Oxygen (DO) Standard is Key Element for Aquatic Life Beneficial Use 7 Truckee River downstream of Lake Tahoe Dissolved Oxygen Sunlight Flow Algae Aeration Nutrients (N&P) Temperature Organic Matter

8 Use of Models in the WQS/TMDL Process Watershed Model Water Quality Model Land Use Climate Management Practices Water Quality Nonpoint Loads WWTPs 8

9 Use of Models in the WQS/TMDL Process Watershed Model Water Quality Model Land Use Climate Management Practices Water Quality Nonpoint Loads Meets WQS? No Adjust Point Sources or Land Management Practices Yes Done WWTPs 9

10 WARMF Development and Calibration 10

11 11 WARMF: Watershed Model Peer reviewed, public domain Predicts watershed flow and pollutant loads based on –land use –meteorological conditions –water management –watershed improvements 125 catchments (subwatersheds) Time step = 1 day

12 Key Processes of WARMF 12 Subsurface Processes Mineral Weathering AMD Septic Systems Organic Matter Decay Nitrification Cation Exchange Plant Uptake Driven by meteorology and land use –Simulates nonpoint source loads; point source loads are input Simulates hydrology, mass balance, acid-base chemistry, erosion / sediment transport, pollutant build-up / wash-off, water quality, algal nutrient dynamics (simplified) Evaluates changes in nonpoint loading with varying land use, meteorological conditions, water use

13 WARMF Input Data 13 Data TypeData SourceDetails TopographyUSGS DEM (Digital Elevation Model)Basis for watershed delineation MeteorologyNCDC, SNOTEL Daily data of precipitation, min/max temp, cloud cover, wind speed, air pressure, dew point temperature Air QualityNADP/CASTNETWeekly data of dry and wet deposition Managed flow (diversions) FWM, TROA Information System, USGS Flow for all active agricultural and M&I diversions (46) ReservoirUSGS, USBR, CDEC Flow release, elevation, and bathymetry for 6 managed reservoirs Point sourcesTMWRF, NDEP, TTSA 2 major and 5 minor sources; flow and WQ records Land Use / Land CoverNLCD, Washoe County Spatial data circa late 1990s; 12 LULC categories Observed HydrologyUSGS, TRIGAll USGS gages (~ 30) within watershed Observed Water Quality TMWRF, TRIG, NDEP, STORET, LRWQCB, TTSA Real-time and grab water quality samples at stations throughout watershed (~40 stations)

14 WARMF Calibration / Application Model Calibration: Model Confirmation / Verification: – – Calibration Report: Systech, Adaptation of the WARMF Watershed Decision Support System to the Truckee River Basin of California and Nevada, 2007 Calibration Report, Prepared for City of Reno and City of Sparks, NV, Prepared by Systech Engineering, December Report available on TRIG 14

15 TRHSPF Development and Calibration 15

16 16 TRHSPF: River Water Quality Model Long history of HSPF applications in Truckee River (USGS) Updated to include periphyton based on DSSAMt science Open code, EPA-supported, peer reviewed Inputs are flow, watershed loads, point sources Predicts water quality response of river –nutrients periphyton dissolved oxygen

17 TRHSPF Model Domain 43 segments from E. McCarran Blvd to Marble Bluff Dam Average reach length 1.31 miles Time step = 0.5 hr 17

18 Key Processes Modeled in TRHSPF Stream hydraulics Water quality –Temperature, nitrogen, phosphorus, algae, oxygen 18

19 Key Processes Modeled in TRHSPF (continued) Mass transport (Nitrogen, Phosphorus, TDS) Nutrient dynamics Productivity (algae growth and decay) –Performed literature review on benthic algae modeling –HSPF Enhancements based on DSAMMt algorithms 19

20 TRHSPF Input Data 20 Data TypeData Source Details Climate (Hourly)NCDC, WRCC Air Temperature, Dew Point, Wind, Cloud Cover, Solar Radiation (by reach) StreamflowUSGSFlow for 6 locations Water QualityTMWRF (YSI & Grab) WQ (YSI) updated for 3 parameters at 9 locations. WQ (Grab) for 18 parameters at 9 locations. TMWRF WQ input updated for 16 parameters DiversionsFWM, TROA Information SystemFlow for 10 diversions Groundwater Repeat of time series based on Nowlin (1987) / Brock (1992) / Pohll (2001) WQ input updated for 13 parameters Upstream / tributary loads Historical data or WARMF output TR at Reno, Steamboat Creek, N. Truckee Drain

21 TRHSPF Calibration / Application Model Calibration: July 2000 – August 2002 –Many parameters estimated from data –Concurrent algae biomass and water quality data available for calibration –Acceptable comparison confidence that algorithms can predict benthic algae reasonably well Model Confirmation / Verification: 1990, 1995, 1996 Calibration Report: LimnoTech Final Draft Calibration of the Truckee River HSPF Water Quality Model. Prepared for the Cities of Reno and Sparks, Nevada, January, Report available on TRIG 21

22 Model Updates 22

23 Truckee River Water Quality Model Updates Goal: develop best possible tools given reasonable time, information, and funding Due diligence to ensure models work well for recent time period Model update steps: –Extended models to run through 12/2008 – updated all databases –Capture changes in loading due to Truckee Meadows development –Conducted model confirmation runs – held model calibration parameters constant –Documenting changes to models and databases, results of model confirmation Share model information with the focus stakeholder group 23

24 Model Database Updates: WARMF Land Use / Land Cover Old Land Use / Land Cover (LULC) data reflective of late 1990s Rapid growth and development through 2006 New LULC reflective of recent growth Combination of several datasets –2006 National Land Cover Dataset (NLCD) – underlying base layer –2010 Washoe County / Truckee Meadows Regional Planning Agency – developed parcel data supersedes NLCD data –Site-specific additions based on parks layer /Google Earth: ski resorts, golf courses, parks, animal feeding operation 24

25 25

26 26 Late 1990s previously in WARMF

27 27 New 2006/2007 layer imported to WARMF (increased development)

28 Evaluation of Linked WARMF/TRHSPF Modeling Framework Previously used data to drive TRHSPF upstream boundary – now using WARMF results Comparison of TRHSPF results to data isnt just evaluation of TRHSPF, but evaluation of linked WARMF/TRHSPF Allows for modeling of river WQ response based on changes in watershed 28

29 TRHSPF DO Results at Tracy / Clark 29

30 TRHSPF DO Results at Marble Bluff Dam 30

31 Summary of Model Update Confirmation of WARMF and TRHSPF for period –Model updated to reflect rapid regional growth through 2006 Both models are ready for use to support the third- party WQS and TMDL review efforts Third-parties welcome comments and questions from Focus Stakeholder group Model confirmation report being finalized 31

32 Intended Use of Models for WQS Review Provide linkage between nutrient loading to the Truckee River and resulting dissolved oxygen levels Account for other factors (flow, temperature, light, organic matter, aeration) Understand balance of nutrient concentrations which result in DO WQS attainment under a range of flow conditions 32

33 Model Linkage – Observed Conditions Watershed Model Water Quantity Water Quality Model Land Use Climate Soil Types Management Practices Reservoir Releases Water Quality Pollutant Loads WWTPs WARMFTRHSPF 33

34 Model Linkage – Future Conditions Watershed Model Water Quantity Water Quality Model Land Use Climate Soil Types Management Practices Water Quality Pollutant Loads WWTPs WARMFTRHSPF 34 Flow Management Model

35 Water Quality Model Linkage 35

36 Selection of Flow Management Model Flow management model will provide a mechanism to determine a representative low flow condition with current river operations and historical climate TROM (Truckee River Operations Model) –Long history of application in Truckee River –Previously coupled with WARMF/TRHSPF for test simulation RiverWare –Newer model; water accounting version functional –Still under development 36

37 Next Technical Steps in WQS Review Process Finalize model update report; distribute to stakeholders Solicit feedback from stakeholder group Construct / run a set of scenario runs –Establish representative low flow –Link flow management model with WQ models –Vary N and P concentrations DO response Document any recommendations for revised WQS Submit report to NDEP for WQS Review 37

38 Questions? 38


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