watershed targeting program - usda ars pmt...stream weighting c factor k factor r factor p factor ls...
TRANSCRIPT
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Watershed Targeting Program
• Presented by• Dr. Jon F. Bartholic, Director
• November 3, 2011• Washington, DC
USDA Technology Workshop
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Productivity and Conservation Enhancement: Mapping, Assessing
and Tracking
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Losses of Sediment and Nutrients from Fields
Slide 3
Robert Kellogg, Natural Resources AnalystNRCS Headquarters, Resources Inventory
and Assessment Division
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Phosphorus Loss (pounds/acre), Baseline
Slide 4
0
2
4
6
8
10
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0 10 20 30 40 50 60 70 80 90 100
Aver
age
annu
al p
hosp
horu
s lo
st to
sur
face
wat
er
(pou
nds/
acre
)
Cumulative percent acres
Upper Mississippi Chesapeake Bay Great Lakes
Means:CB = 3.7
pounds/AUM = 2.7
pounds/AGL = 2.1
pounds/A
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High Impact Targeting Decision Support System for BMPs to Most Effectively Reduce NPS Pollution
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• HIT combines an erosion model and a sediment delivery model (SEDMOD -Spatially Explicit Delivery Model) to calculate annual sediment loading (correlated with N and P loads) to streams.
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3
HIT Model
Rainfall
SupportPractice
Land Cover
Landuse/Tillage
Soil ClayContent
Soil Erodibility
DEM
Delivery Ratio
Soil Erosion
SedimentYield
SurfaceRoughness
SoilTexture
Distance toStream
Weighting
C Factor
K Factor
R Factor
P Factor
LS Factor
RUSLE2
SEDMOD1
1. Fraser, R. SEDMOD: A GIS-based Delivery Model for Diffuse Sources Pollutants (doctoral dissertation). Yale University. May 1999.
2. Renard, K.; Foster, G.; Weesies, G.; McCool, D.; Yoder, D. Predicting Soil Erosion by Water: A Guide to Conservation Planning with the Revised Universal Soil Loss Equation (RUSLE). USDA, Agriculture Handbook Number 703. 1996.
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New Basin Wide System
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7- Select watersheds for analysis spatially, by name, HUC, or address.
The DSS – www.iwr.msu.edu\hit2
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The DSS – www.iwr.msu.edu\hit2
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- Watersheds can be shaded by erosion or sediment data, at multiple scales.
Less loading per acreMore loading per acreMost loading per acre
Least loading per acre
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Within Watershed Analysis
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Field Level Analysis
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Field EvaluationsResults: 70% of the time HIT maps correctly characterized the landscape. locations.
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Root River Stewardship InitiativeStatement of Commitment
“Working Together for Watershed Sustainability”
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Applications within the Root River Watershed
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Root-Pike HIT Modeling
LeastLess
More
Most
Sediment Loading by CLU
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Root-Pike HIT Modeling
LeastLess
More
Most
Sediment Loading by 10-meter pixel
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Now Let’s Go to Sub-Watershed #7
LeastLess
More
Most
Sediment Loading by HUC12
#
Rank
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Potential Gully Locations
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Potential Gully Locations
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Flow Paths
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Field Level Prioritization
Catchment Loads (L-THIA)
Phosphorus 156 lbs.
Nitrogen 560 lbs.
Less loading per acre
More loading per acre
Most loading per acre
Least loading per acre
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Field Level Scenarios
No Till
Grass Waterway
Filter Strip
Catchment Loads (L-THIA)
Phosphorus 156 lbs.
Nitrogen 560 lbs.
Catchment Loads (L-THIA)
Phosphorus 90 lbs.
Nitrogen 305 lbs.
Less loading per acre
More loading per acre
Most loading per acre
Least loading per acre
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Questions & Answers
http://www.iwr.msu.edu