Subwatershed Prioritization in Arkansas - A Modeling Approach Presented by: Dharmendra Saraswat Co-Authors: N. Pai, M. Daniels, and M. Leh ANRC Task Force Meeting, September 21, 2010 Reviewed by: U of A Division of Agriculture Environmental Task Force
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Subwatershed Prioritization in Arkansas - A Modeling Approach
Subwatershed Prioritization in Arkansas - A Modeling Approach. Presented by: Dharmendra Saraswat. Co-Authors: N. Pai , M. Daniels, and M. Leh. Reviewed by: U of A Division of Agriculture Environmental Task Force. ANRC Task Force Meeting, September 21, 2010. MODELING OBJECTIVE. - PowerPoint PPT Presentation
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Subwatershed Prioritizationin Arkansas
- A Modeling Approach
Presented by:Dharmendra Saraswat
Co-Authors: N. Pai, M. Daniels, and M. Leh
ANRC Task Force Meeting, September 21, 2010
Reviewed by: U of A Division of AgricultureEnvironmental Task Force
MODELING OBJECTIVETo assist in assessing the relative risk of sub-watersheds (12-digit hydrologic unit code) for sediment and nutrients contribution from selected 8-digit HUC priority watersheds using State-of-the Art modeling techniques
95)Validation: 2006-2008 Flow at total seven gages, sediment and nutrients at three
MODEL SETUP- COMPARISON
Few studies have used watershed models in spatially distributed fashion
Spatially distributed calibration and validation account for hydrologic patterns in subwatersheds*
* Qi and Grunwald, 2005
ANRC Task Force Meeting, September 21, 2010
Weather
* NOAA -NWS
DATA USED
NEXT GENERATION RADAR (NEXRAD)
ANRC Task Force Meeting, September 21, 2010
ETF Recommendation:
4%, 21%, and 75% for ammonia-, organic-, and nitrate-nitrogen- based on ETF recommendation
Point Source Loading
DATA USED
ANRC Task Force Meeting, September 21, 2010
Poultry litter application adjusted
-Litter application rate adjusted for type of grasses and temporally as well*-Cool-season: 2 ton/ac Warm season: 3 ton/ac-January 2004 onwards, rate declined to 1 ton/ac
2001 NLCD land use map 24 of the 44 subwatersheds in BBW had some wetland surface area
ANRC Task Force Meeting, September 21, 2010
NEXRAD
Weather
* NOAA -NWS
DATA USED
ANRC Task Force Meeting, September 21, 2010
Percentile Approach – Sediment
SUBWATERSHED IDENTIFICATION
ANRC Task Force Meeting, September 21, 2010
Preliminary Results
SUBWATERSHED IDENTIFICATION
ANRC Task Force Meeting, September 21, 2010
Preliminary Results
Percentile Approach – Total Phosphorus
Percentile Approach – Nitrate-Nitrogen
SUBWATERSHED IDENTIFICATION
ANRC Task Force Meeting, September 21, 2010
Preliminary Results
OVERALL SUMMARY
State of the art modeling and latest data was used for calibrating and validating SWAT model Total number of gages utilized varied from one to seven in different selected watersheds NEXRAD data used for precipitation as per availabilityModel outputs such as, total flow, surface flow, base flow, sediment, nitrate-nitrogen, and total phosphorus were rigorously evaluated using latest performance criteria In most of the subwatersheds, generally land use, soils, and slope association seen with high/low concentrations for water quality constituents
ANRC Task Force Meeting, September 21, 2010
OVERALL SUMMARY..CONTD.
Uncertainty estimation to assess risk associated with model outputs is gaining ground. Quantification of input data uncertainty is desirable to assess model performance The model output has been used to rank subwatersheds on a relative basis. Absolute conc. of water quality constituent may not be of concern Data gaps noticed in LCPR It is encouraged that modeling results are also compared with other local information for decision making purposes Monitoring and Modeling are complimentary and monitoring data is required for having confidence in modeling results
ANRC Task Force Meeting, September 21, 2010
ACKNOWLEDGMENTS
ANRC Task Force Meeting, September 21, 2010
Dr. Robert (Bob) Morgan, Beaver Water District
Dr. Srinivasan (Srini) Raghavan
Dr.(s) Jeff Arnold, Mike White and Nancy Sammons
Dr. Amy Apon and Mr Jeff Pummil,UA High Performance Computing Center