asher young - watershed scale conservation
DESCRIPTION
69th SWCS International Annual Conference July 27-30, 2014 Lombard, ILTRANSCRIPT
Jeremiah Asher, GIS Project ManagerLaura Young, Research Assistant
Michigan State UniversityInstitute of Water Research
69th Soil Water Conservation Society International Annual ConferenceMaking Waves in ConservationJuly 29, Lombard, Illinois
Great Lakes Watershed Management System Walkthrough
Watershed Scale Conservation: How much is Enough?
Outline
• Underlying Models– HIT– L‐THIA
• Types of Analyses• Walkthrough Example
UNDERLYING MODELS
Background | Models
High Impact Targeting (HIT)HIT estimates sediment loading from agricultural lands to nearby streams
Long‐Term Hydrologic Impact Analysis (L‐THIA)L‐THIA estimates run‐off volumes and pollutant loads
HIT Model
HIT: Field Evaluations
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Results: 70% of the time HIT maps correctly characterized the landscape.
Basic L-THIA Model Components
Hydrologic component estimates average annual direct runoff based on the Curve Number method with daily rainfall data
Water quality component estimates pollutant loadings using estimated direct runoff and coefficients associated with land uses
7Purdue University is an Equal Opportunity/Equal Access institution.
Nonpoint Source Pollution
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L‐THIA produces Average Annual Pollutant Results for sediment, nutrients, a series of metals, and bacterial indicators(e.g. lbs of Nitrogen per year)
Available L‐THIA NPS Outputs in GLWMS:
Total RunoffNitrogenPhosphorousTotal Suspended SolidsLeadCopperZinc
Purdue University is an Equal Opportunity/Equal Access institution.
SYSTEM WALKTHROUGH
www.iwr.msu.edu/glwms
View Baseline NPS
• Estimates baseline nonpoint source pollutant loadings
Calculate a Baseline Change
• Estimates the change in runoff and NPS pollutant loadings based on a land cover change or best management practice
Compare 2 Scenarios
• Specify two different land cover or practices (before and after)
• Allows you to set your own baseline• Useful for when detailed knowledge is available for a land area
http://www.ars.usda.gov/pandp/docs.htm?docid=9372 Photo courtesy of USDA ARS
Conventional TillageNo Till with Cover Crop
