11B – USING RASTER MATH TO ASSESS WETLAND FUNCTIONALITY CAPACITY BASED ON HYDROGEOMORPHIC (HGM) CLASSIFICATION
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The document discusses using raster math to assess wetland functional capacity based on hydrogeomorphic (HGM) classification. It describes how wetlands are classified using HGM types and factors like soil type and pH that are used as inputs for analyzing wetland functions. Raster math is used to reclassify inputs as low, medium, or high to assess the capacity of wetlands to perform functions like groundwater discharge, flood storage, and wildlife habitat on a scale. This approach allows for scalable and portable wetland assessments.
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11B – USING RASTER MATH TO ASSESS WETLAND FUNCTIONALITY CAPACITY BASED ON HYDROGEOMORPHIC (HGM) CLASSIFICATION
- 1. Using Raster Math to Assess Wetland Functional Capacity Based on Hydrogeomorphic (HGM) Classification Justin Hawley March – GIS Specialist Flat Rock Geographics [email_address] Tim Kelly – Administrator Coon Creek Watershed District [email_address] Image Removed
- 2. Wetland Functional Capacity Assessment Rapid Assessment for short Released in 1998 Developed from: US Army COE 1992; Smith, Brinson Available from The Association of State Wetland Managers http://aswm.org/
- 3. Analyzing Wetland Functional Capacity REQUIRED BY: Clean Water Act: Section 404 Wetland Conservation Act OTHER ALLOWED METHODS: Minnesota Routine Assessment Methodology for Evaluating Wetland Function (MnRAM) Wetland Evaluation Technique (WET) Wetland Evaluation Methodology (WEM)
- 4. Wetland Classification Types Circular 39 Classifications: Type I, Type II, etc… Cowardian Classifications (NWI): PEMA, PEM/SS1Bd, PUBFx, etc…
- 5. Wetland Classification Types Lacustrine Fringe Lacustrine Fringe Flats Flats Floodplain Riverine Not Present in CCWD Slope Wetlands Depressions & Swales Depressional Wetlands Bogs Extensive Peatland CCWD Adjustments (MN) Hydrogeomorphic Classification (US) Constants
- 6. Hydrogeomorphic Classification Wetland type based on Hydric Soils * Why? NWI delineated from 1979-1988 aerials Land use changes Agricultural cultivation * for the most part.
- 8. Functional Analyses Modification of Ground Water Discharge (5 inputs) Modification of Ground Water Recharge (6 inputs) Storm and Flood Water Storage (7 inputs) Modification of Stream Flow (GW Recharge x Storm & Flood Water Storage) Modification of Water Quality (6 inputs) Contribution to Abundance and Diversity of Wetland Vegetation (5 inputs) Contribution to Abundance and Diversity of Wetland Fauna (11 inputs)
- 9. One Example: Ground Water Discharge PRIMARY VARIABLES TYPE SOURCE pH.……………………………………………………...Soil Survey Input/Output Classification……………….NWI (adjusted) Surface Geology…………………………………….Soil Survey Wetland Regime………………………………NWI (adjusted) Soil Type………………………………..…………….Soil Survey
- 10. Soil Type………………………………..…………….Soil Survey Input/Output Classification……………….NWI (adjusted) pH….…………………………………………………...Soil Survey Surface Geology…………………………………….Soil Survey Wetland Regime………………………………NWI (adjusted)
- 11. pH: Input/Output Classification: Surface Geology: Wetland Regime: Soil Type: Alkaline / Neutral / Acid Alkaline ( Rondeau Muck. pH = 7.4 - 8.0 ) Neutral ( Millerville Mucky Peat, etc. pH = 6.5 – 7.3 ) Acid ( Sartell Sands, Isan Loam, etc. pH = 4.5 – 6.5 ) Perennial Inlet/Outlet Intermittent Inlet/Outlet High Permeability ( Sandy soils ) Low Permeability ( Muck, Peat, Marsh ) Wet ( NWI Mods E, F, G, & H ) Dry ( NWI Mods A,B, & C ) Histisol Mineral Hydric
- 12. Values entered Manually (1, 2, 3). Values entered manually for the input variable (pH, Soil Type, Regime, etc…).
- 13. Bogs Depressions / Swales Flats Floodplain Lacustrine Ground Water Discharge pH I/O Class Surface Geology Wetland Regime Soil Type Alkaline Neutral Acid 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 3 3 0 3 2 2 2 0 2 2 2 2 2 2 1 2 0 2 3 3 3 0 0 1 1 0 1 1 1 1 3 3 1 1 0 2 0 2 2 Perennial in/outlet Dry Histiols Mineral Hydric Wet Intermittent in/outlet Low permeability High permeability
- 14. Raster Math
- 16. Reclassification Low / Medium / High
- 17. Benefits Scalable : Survey area size and dimension does not affect outcome. Portable : Method can be used in any area accounted for in with the HGM classification (North America). Modular : More accurate data can easily be adapted into the inputs for greater localized assessment.
- 18. Thank you. Questions? 763-755-0975 Justin Hawley March – GIS Specialist Flat Rock Geographics [email_address] Tim Kelly – Administrator Coon Creek Watershed District [email_address]