Introduction to the Hydrogeomorphic (HGM) Classification System
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1 Introduction to the Hydrogeomorphic (HGM) Classification System
2 Objectives The Student Will be Able to: Define the 7 HGM Classes List the 3 Parameters That Define HGM Classes List the Major Water Budget Components for Each Class Select Appropriate Local Reference Domains Determine Useful Local HGM Sub-classes Relate HGM Sub-Classes to Soils Ready to Learn how to Select the Appropriate Analysis Technique for Sub-Classes
3 HGM Originally for Development of Functional Assessment Models (Brinson, et. al.) Starts with 7 Wetland Classes Requires the Determination of a Reference Domain where a certain subclass exists Must make a decision between lumping and splitting
4 Three Factors that Define Wetland Classes Landscape Position Dominant Water Source Hydrodynamics
5 The Seven HGM Classes RIVERINE SLOPE MINERAL SOIL FLAT ORGANIC SOIL FLAT ESTUARINE FRINGE LACUSTRINE FRINGE DEPRESSION Slope Puerto Rico Depressional Carolina Bay Estuarine Fringe Oregon Mineral Flats Indiana Flatwoods
6 Reference Domains - Major Land Resource Areas Slide 6 Site Concept Valid Within MLRA Extent (or subdivision of MLRA)
7 HUC-12 in MLRA 103 Northeast Kansas Slide 7 Headwater HUC Similar to other Headwater HUC in MLRA 103 Reference Domain
8 Same Map Units Correlate to Similar Sub-Classes in Slide 8 Adjacent HUCS (Same MLRA) Floodplain Landscape
9 Landscape Boundaries - RIVERINE Slide 9 Wabash Occasionally Flooded Poorly Drained Backswamp? Kennebec Moderately Well Drained Occasionally Flooded Natural Levee?
10 RIVERINE Wetlands Landscape Position Floodplains Dominant Water Source Surface Flooding AND/OR Groundwater Inputs Hydrodynamics Horizontal, Bi-Directional Floodplain Oxbow -Wyoming
11 RIVERINE Wetlands Landscape Position: Soils Geomorphic Description - Floodplain
12 RIVERINE Dominant Water Slide Source Stream Hydrograph 12 Soil Water Features Flooding Ponding Groundwater Hydroperiod
13 RIVERINE Surface Flooding (Lotic) Slide 13
14 RIVERINE Ponding (Lentic) Slide 14
15 RIVERINE Floodplain Groundwater Slide 15
16 How Many Sub- Classes? Slide 16 Active Channel: Flooding Natural Levee: Non-wetland Backswamp: Groundwater Upland: Non-wetland
17 RIVERINE Landscapes Can have Multiple HGM Sub-Classes Unique: Landform Plant Community Groundwater Table Flood Frequency Flood Duration Ponding Potential Soil
18 Introducing - Endosaturated Riverine Tongue River, Wyoming Ninnescah River, Kansas Saturated from Below USDA NRCS Module Name 18
19 Endosaturated Riverine Features High Ksat Floodplains (Sands Gravels) Wet from high groundwater Attenuated hydrographs Strong Baseflow in channel Surface Flooding not needed to create wetland hydrology High groundwater No ponding Flooding need not be long duration or high frequency for ecological function Groundwater Rises and Falls with the Stream Water Surface USDA NRCS Module Name 19
20 Introducing - Episaturated Riverine Iowa photo: NRCS Photo Gallery USDA NRCS Module Name 20
21 Episaturated Riverine Features Low Ksat Floodplains (Silts and Clays) Weak Connection between stream water surface and floodplain Groundwater level Wet when inundated or ponded only Perched groundwater Ponding in backswamps Frequency and Duration of Flooding critical for ecological functions RIVERINE, Backswamp, episaturated herbaceous USDA NRCS Module Name 21
22 RIVERINE Ponded Backswamp Hydric (Floodplain Oxbow) Partiallly Hydric (Floodplain Flat) Active Channel RIVERINE, Backswamp, episaturated herbaceous In MLRA 73 USDA NRCS Module Name 22
23 RIVERINE Morphology - Natural Levees Backswamps Verdigris Series Partially Hydric Natural Levee Osage Series Hydric Backswamp Slide 23
24 SLOPE Dominant Water Source Groundwater Discharge Slide 24
25 SLOPE Landscape Position Concave Topographic positions, usually stream headwaters Slide 25
26 Topographic SLOPE Wetland Plan View Concave Landscape Positions Typical of Stream Headwaters Slide 26
27 Topographic SLOPE Cross-Section Deep Discharge Shown Here Often is Shallow Subsurface Flow in Soil
28 Potential Bog Turtle Habitat Typic Endoaquults Groundwater Dominated Soils In Low Stream Order Landscapes SLOPE, Headwater Slide 28
29 SLOPE Wetlands Idaho Headwater Fen Kansas Headwater New York Headwater Fen Fens SLOPE Class Near continuous discharge Organic Soil Slide 29
30 Slope HGM Class Wetland Wyoming (Sage Grouse Country) Slide 30
31 SLOPE Wetland Before Restoration Surface Saturated Groundwater Fed Large Scale Not Flooded Not Ponded Slide 31
32 SLOPE Wetland After Restoration Lowered Groundwater Aerated Organic Soil Lateral Effect of Constructed Stream Restoration Loss of Wetland Hydrology Slide 32
33 To Drain a SLOPE Wetland - Finger Lakes Region, NY Groundwater From Uplands Simply Plug the Ditch Restores Groundwater Discharge Intercept Groundwater at Point of Discharge USDA NRCS Module Name 33
34 OR Install a Drainage Ditch Through It Groundwater Discharge Des Moines Lobe, Iowa USDA NRCS Module Name 34
35 OR Allow a Gully to Form Through It Nebraska Sand Hills Formerly Saturated Surface Upstream Dam has Captured Sediment Current Groundwater Discharge Level Aerated Organic Soil USDA NRCS Module Name 35
36 MINERAL SOIL FLAT Dominant Water Source- Direct Precipitation Landscape Position Interfluves Low Flow Accumulation Depressions may be embedded within Mineral Flats Slide 36
37 MINERAL FLAT Wetland Hydrodynamics Vertical, Downward Dominant Water Source - Precipitation Slide 37
38 Mineral Flat Extent Map 0-2% Slopes Poorly Drained to Very Poorly Drained Decrease in Ksat with Depth Perched Water Table Slide 38
39 ORGANIC SOIL FLAT Dominant Water Source Direct Precipitation Ombotrophic Bogs Pocosins Pocosin North Carolina Slide 39
40 ESTUARINE FRINGE Dominant Water Source - Tides Slide 40
41 Estuarine Fringe Organic Soils are Common Tidally Influenced Salt, Brackish, or Freshwater Adjoins Riverine HGM landscapes Slide 41
42 ESTUARINE FRINGE Tidal Inlet Channels Slide 42
43 LACUSTRINE FRINGE Dominant Water Source- Lake Fluctuations Yellowstone Lake, Wyoming Horizontal, bi-directional Slide 43
44 DEPRESSIONAL Closed Topographic Depressions Nebraska Rainwater Basin Recharge Depression Wyoming Recharge Depression, Gillette South Dakota Prairie Pothole South Carolina Carolina Bay Slide 44
45 DEPRESSIONAL Dominant Water Source Surface Runoff and/or Groundwater Slide 45
46 Depressional Recharge Slide 46
47 Depressional Discharge or Flow Through Recharge G o > G i Discharge G i > G o Flow Through G i = G o Slide 47
48 DEPRESSIONS Web Soil Survey Map Units South Dakota Prairie Potholes Recharge, Discharge, and Flowthrough Texas Playas Recharge Randall Clay Slide 48
49 Generalized Landscape Map Slide 49
50 HGM Parameters The Hydrogeomorphic (HGM) Classification System is based on 3 factors Landscape Position WHERE it is Dominant Water Source Not the ONLY Source Hydrodynamics The direction(s) of water movement in and out Slide 50
51 Questions? Kansas Flint Hills photo: Jon Fripp
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