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SWAT Modeling and Monitoring of Priority Watersheds- Phase III

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Presentation on theme: "SWAT Modeling and Monitoring of Priority Watersheds- Phase III"— Presentation transcript:

1 SWAT Modeling and Monitoring of Priority Watersheds- Phase III
Project No SWAT Modeling and Monitoring of Priority Watersheds- Phase III Dharmendra Saraswat, Ph.D. Assoc. Prof,/Ext. Engineer- Geospatial (mobile) Mike Daniels, Ph.D. Professor and Statewide Water Quality Specialist Brian Haggard, Ph.D. Professor and Director, AWRC Tom Riley Director, Public Policy Center ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

2 Prioritize 12-digit HUCs using SWAT model output
Objective Project Objective Prioritize 12-digit HUCs using SWAT model output ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

3 Lower Ouachita Smackover Watershed
Watershed Profile Lower Ouachita Smackover Watershed Area: sq. mi. Land-use: Forest (94%) Pasture (3%) Urban (2%) Water (1%) Elevation: 202 ft. (mean) Slope: 37% area under 3-8% slope Soil: 83% area under group C/D Precipitation: 52 inch (mean) ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

4 Watershed Profile Cache River Watershed Area: 1956 sq. mi.
Land-use: Water (2%) Pasture (3%) Urban (3%) Barren (3%) Forest (25%) Crops (64%) Elevation: 351 ft. (mean) Slope: 48% area under 0-1 % slope Soil: 36% area under group C/D Precipitation: 35 inches (mean) ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

5 Overall Project Approach
Precipitation PBIAS NSE R2 RSR Temperature Calibration/ Validation SWAT Check Nutrient init. SWAT Prioritization (Flow-weighted concentration) Soils Land-use/ management practices Point Sources Topography ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

6 SWAT Model Setup: Spatial Data
Boundary (12-digit HUC) Elevation (DEM-5 m) Soil Map (SSURGO) Landuse (92, 99, 01, 04, 06) Streams (NHD) Weather (NEXRAD, Gages) ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

7 SWAT Model Setup: Tabular Data
Management Data Crop rotation Timing & frequency of tillage Planting date Harvesting date Timing and rate of fertilizer application Irrigation Pesticides SWAT 2012 Cropping practices for each county Point source discharge (ADEQ) ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

8 Quality Control SWAT Check Input Data Errors
Initial Model Development Problems Improper Parameter Adjust During Calibration Process not Properly Represented Known SWAT Model application Errors ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

9 Water Quality Monitoring in the Lower Ouachita-Smackover Watershed
ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

10 objective (1) Better understand how water quality changes across headwater sub-water sheds draining different land use mixes (2) Estimate nitrogen (N), phosphorus (P), and sediment loads at select sites where active USGS stage and discharge monitoring stations exist. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

11 Overall goal The knowledge attained from this project will help validate the SWAT modeling output, and improve the level of confidence that we have in the sub-watershed prioritizations based on the SWAT output. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

12 procedure USE AWRC PROTOCOL Collect over 250 water samples from 21 sites in Lower Ouachita-Smackover Watershed starting November 2013 through October 2014. The routine, monthly sampling will be used to understand how physicochemical properties change in relation to the mix of catchment land use. Collect storm samples from 2 USGS sites. -Moro Creek, Fordyce, AR -Smackover Creek, Smackover, AR ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

13 Sampling sites Sites Moro Creek Caynes Creek Ouachita River Haynes Creek Holmes Creek Smackover Creek Camp Creek Sloan Creek Gum Creek South Bayou North Bayou Two Bayou Hussey Creek Locust Bayou Champagnolle Creek Bryant Creek ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

14 Storm sampling What we’re doing Usage of Alpha Meter
Online USGS discharge data at Moro Creek and Smackover Creek used to determine when to grab storm samples. 1) one of the rising limb 2) one near peak 3) one on the falling limb ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

15 Storm sampling Grab 2 Grab 3 Grab 1
ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

16 **Distance covered (miles)
Storm sampling-efforts Month Moro Creek Smackover Creek # of samples a month **Distance covered (miles) Nov. 2013 3 1 4 1,593 Dec. 2013 2 5 1,717 Jan. 2014 8 2,347 Feb. 2014 7 11 2,540 Mar. 2014 15 2,800 Apr. 2014 16 14 30 5,052 May. 2014 6 3,809 Jun. 2014 12 27 5,015 Jul. 2014 10 3,941 Aug. 2014 3,975 Sept. 2014 Total 71 75 146 32,789 **Distance includes trips to Fayetteville, AR for sample analysis. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

17 What are we doing in the lab
TASKS Water Samples from the 21 Sites and Storm Sampling Process water samples, filtering a portion and saving raw water. Testing for the following: Conductivity Nitrate-nitrogen (NO3-N), Total nitrogen (TN) Soluble reactive phosphorus (SPR) Total phosphorus (TP) Total suspended solids (TSS) Turbidity (NTU) Include appropriate lab quality assurance & control, like spikes, duplicates, and blanks Water samples were delivered to the lab within 48 hours. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

18 Preliminary results Moro Creek Storm Sampling
Precipitation (inches) -Nov. 2013= Dec. 2013=7.45 -Jan. 2014= Feb. 2014=3.95 -Mar.2014= Apr. 2014=6.02 -May.2014= Jun. 2014= 2.98 -Jul = Aug.2014=5.83 Total=45.6 in Nutrient -NO3 rises increases as discharges rises. -PO4 remains constant. Sediment -TSS and Turbidity increases as discharges increases. - There is more TSS than Turbidity with heavy precipitation. On average, it takes hours from rising limb to falling limb to be collected. Average peaks were 4-8 hours. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

19 Preliminary results Smackover Creek Storm Sampling
Precipitation (inches) -Nov. 2013= Dec. 2013=6.56 -Jan. 2014= Feb. 2014=3.42 -Mar.2014= Apr. 2014=5.64 -May.2014= Jun. 2014= 3.06 -Jul = Aug.2014=2.36 Total=41.7 in Nutrient -NO3 rises as discharges rises, but tends to decrease the longer discharge flow. -PO4 increases as discharges rises. Sediment -TSS and Turbidity increases as discharges increases and they typically remain in sync with one another. On average, it takes 72 hours from rising limb to falling limb to be collected. Average peaks were 10 hours. ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

20 Acknowledgements Henry Green- Program Technician
Gurdeep Singh, Eeshan Kumar, and Mouli Koppolu- GRA ANRC NPS Annual 319 Program Review Meeting, September 18, 2014

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