Web-based Tools for Soil Erosion Assessment/Management
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1 Web-based Tools for Soil Erosion Assessment/Management Glenn O Neil GIS Specialist Institute of Water Research Michigan State University Managing and Understanding Sediments in Your Watershed Workshop U.S. Army Corps of Engineers, Detroit District Marine Corps Naval Reserve Training Center, Buffalo NY December 8, 2009
2 Topics Digital Watershed High (sediment) Impact Targeting RUSLE On-line
3 Topics Digital Watershed A Nationwide Web Application Tool for Effective Watershed Management High (sediment) Impact Targeting RUSLE On-line
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7 New Feature: Search for a Watershed 7
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17 Digital Watershed and ATtILA Runs ATtILA
18 Digital Watershed: ATtILA results
19 Digital Watershed and ReVa Connects to ReVa
20 Digital Watershed: ReVa results 20
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26 Delineate a Watershed
27 Delineate a Watershed cont.
28 Topics Digital Watershed High Impact Targeting An on-line tool to efficiently target erosion and sedimentation conservation practices in agricultural areas. RUSLE On-line
29 High Impact Targeting (HIT) Applying Conservation Tools to the Worst Erosion Areas for Maximum Sediment/Nutrient Reductions Glenn O Neil: Institute of Water Research Michigan State University Teresa Salveta: Michigan Department of Agriculture Tom Hanselman: Huron County Conservation District Lauren Lindeman: Lenawee County Conservation District John Switzer: Clinton County Conservation District 29
30 HIT Model Land Cover Surface Roughness SEDMOD 1 Soil Clay Content Soil Texture Weighting Delivery Ratio DEM Distance to Stream LS Factor Sediment Yield Yield Landuse/Tillage C Factor Soil Erodibility Rainfall K Factor R Factor Soil Erosion Support Practice 1. Fraser. May 1999 P Factor 2. Renard, Foster, Weesies, McCool, Yoder RUSLE 2 30
31 Early Targeting Efforts - Da Ouyang (IWR), Jon Bartholic (IWR), Jim Selegean (ACE) - Coarse Great Lakes Basin analysis Estimated Sediment Load (tons/yr) Conventional Tillage Reduced Tillage No Till 1. Ouyang, et al.,
32 Early Targeting Efforts Estimated Total Sediment Loading by 8-digit Watershed 1. Ouyang, et al.,
33 Conservation Innovation Grant A multi-scale partnership - Federal: - State: - University: Project oversight Funding Project coordination Outreach Model and Web development - Local: Conservation Districts - Clinton - Huron - Lenawee Model evaluation Website feedback Outreach BMP targeting 33
34 Conservation Innovation Grant Project Goal: Apply conservation tools to the worst erosion areas for maximum sediment/nutrient reductions. Timeframe: Pilot Areas: Three Michigan watersheds Pigeon-Wiscoggin Maple Raisin 34
35 Targeting Sub-watersheds (Lower Maumee River Watershed NW Ohio) 35
36 Applying BMP (no-till) on highest risk acres in contrasting watersheds Watershed Acres Tillage Total Sediment (tons) Reduction (tons) Percent Change Garret 18,065 current practice 1, % Garret no till on worst 5% 1, % Garret no till on worst 10% 1, % Wolf 17,440 current practice Wolf no till on worst 5% Wolf no till on worst 10%
37 Spatially exploring areas at high-risk for sediment loading A site in the Maple River Watershed: tons/acre tons/acre > 0.8 tons/acre Corn residue runoff in ditch. 37
38 Making the Data Web-Accessible: Analyze data at different watershed scales Work with single, all, or subset of sub-watersheds View data in multiple formats View sediment loading or erosion data Optionally evaluate a BMP 38
39 Basic watershed info. Making the Data Web-Accessible: Table Results Estimated sediment loading BMP impact and cost/benefit Columns can be sorted. BMP costs can be recalculated on-the-fly 39
40 Making the Data Web-Accessible: Viewing the data spatially 40
41 Team Effort Development of HIT was a team effort: Clinton C.D. John Switzer Huron C.D. Tom Hanselman Lenawee C.D Lauren Lindeman Michigan Dept. of Ag. Teresa Salveta Provided feedback on HIT Facilitated public outreach Helped define HIT s appropriate audiences Assessed HIT model through field evaluations and stream monitoring 41
42 Field Evaluations The C.D. technicians visited over 200 fields in the pilot watersheds and evaluated the accuracy of the high-risk maps. 42
43 Field Evaluations Results: 70% of the time HIT maps correctly characterized the landscape. locations. 43
44 Field Evaluations Primary causes of errors at other 30%: - Coarse land cover input (30-meter resolution) - DEM unable to accurately characterize flow-direction 44
45 Stream Monitoring MDA and Conservation Districts are currently evaluating HIT sediment estimates. - NHD Plus catchments (average size 700 acres) were ranked by sediment loading through HIT.. - C.D. Technicians took samples during weather events and sent them to Michigan DEQ for analysis. - IWR will utilized DEQ results to determine if HIT adequately ranked catchments by sediment loading NHD Plus catchments of the River Raisin Watershed 45
46 HIT Highlights Conservation districts are using HIT to prioritize efforts. HIT data is being viewed within the NRCS Toolkit, integrating HIT into the workflow of conservation technicians. Michigan DEQ is promoting HIT in the development of 319 plans. Clinton C.D. and consultants have used it in Maple River 319 plan. 46
47 HIT Limitations Focused primarily on agricultural lands, not suitable for urban analysis. Focused on sheet erosion (RUSLE), not gully, bank, or wind. Estimates of erosion and sediment loadings are for relative comparisons of watersheds, are not intended for precision. 47
48 What s Next? HIT Built on Microsoft Bing Maps - Available for the entire Great Lakes Basin - Allows for analysis at all watershed scales 48
49 HIT Select watersheds for analysis spatially, by name, HUC, or address. 49
50 HIT HIT tables can be generated as in the original system. 50
51 HIT Watersheds can be shaded by erosion or sediment data. Least loading per acre Less loading per acre More loading per acre Most loading per acre 51
52 HIT Improved aerial imagery allows for richer field-level analysis. 52
53 In Conclusion Through the development of HIT, this CIG project has helped local conservation districts prioritize efforts to reduce erosion and sediment loading from agricultural lands. Field evaluations have shown HIT s high-risk maps to be reliable. Stream monitoring assessments are underway to evaluate HIT s relative erosion and sediment loading estimates. An enhanced, Great Lakes basin-wide version of HIT will be available soon. 53
54 References Fraser, R. SEDMOD: A GIS-based Delivery Model for Diffuse Sources Pollutants (doctoral dissertation). Yale University. May Ouyang, D.; Bartholic, J.; Selegean, J. "Assessing Sediment Loading from Agricultural Croplands in the Great Lakes Basin." The Journal of American Science. Vol. 1, No. 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
55 Topics Digital Watershed High Impact Targeting RUSLE On-line An on-line and user-friendly application for calculating field-level erosion estimates at both agricultural and construction sites.
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57 RUSLE Overview
58 Run RUSLE on Ag Land
59 Select a County
60 Specify Ag Attributes
61 RUSLE Outputs
62 Run RUSLE for a Construction Site
63 Specify Site Attributes
64 RUSLE Outputs
65 Topics Digital Watershed High Impact Targeting RUSLE On-line
66 Questions & Answers
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