(CRAM) For Wetlands User's Manual Version 5.0.2

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California Rapid Assessment Method for Wetlands v. 5.0.2 – Chapter 3 3.2.2 Wetland Typology In determining the appropriate wetland typology for CRAM, the Core Team considered the ecological typology used by NWI, the hydro-geomorphic (HGM) classification used by the USACE, and typologies used in state policy. The NWI typology emphasizes the habitat functions of wetlands. The HGM typology emphasizes wetland hydrology and landscape position. While the Core Team considered the need to be consistent with both of these typologies, it also considered the need to recognize the kinds of wetlands named in California wetland protection policies. The hierarchical CRAM typology reflects all of these considerations, but it favors the HGM classification system overall, with sub-types that reflect State policy. The CRAM typology consists of six major wetland types, four of which have sub-types (Table 3.4 and Figure 3.2). Additional sub-types can be added in the future as needed. Table 3.4: The CRAM Wetland Typology. CRAM Wetland Types CRAM Sub-types (these are recognized for some but not all metrics) Riverine Wetlands Confined Riverine Wetlands Non-confined Riverine Wetlands Individual Vernal Pools Depressional Wetlands Vernal Pool Systems Other Depressional Wetlands Playas no sub-types Perennial Saline Estuarine Wetlands Estuarine Wetlands Perennial Non-saline Estuarine Wetlands Seasonal Estuarine Wetlands Lacustrine Wetlands no sub-types Slope Wetlands Seeps and Springs Wet Meadows Some wetlands will have undergone a conversion from one type to another due to either natural or anthropogenic events. For example, a channel avulsion may capture a depressional wetland and convert it to a riverine system, or construction of a dam may impound a stream and convert it to a lacustrine system. In any case, the wetland should be evaluated according to its current type and condition. Metric scores should be assigned using the ratings for the current state of the wetland, without regard for what the wetland might have been in the past, or what it might become in the future. However, for converted wetlands, the historical type as well as the existing type should be noted. The stressor checklist enables the user to document if the wetland is currently being stressed by the conversion (i.e., if the process of conversion is continuing and a significant source of stress). 20
California Rapid Assessment Method for Wetlands v. 5.0.2 – Chapter 3 Figure 3.2: Flowchart to determine wetland type and sub-type. Spring or Seep Vegetation adapted to seasonal drying? Playa Yes Evidence of extreme pH or salinity with vascular vegetation only on perimeter of seasonal wet area? Yes Non-confined Riverine Yes No Flora characterized by Vernal Pool specialists No Valley width is at least twice channel width? Riverine Yes No Slope Wet Meadow Occurs on slope or base of slope Confined Riverine No No Yes Yes No Yes Is hydrology fully or partially tidal for at least 1 month during most years? Yes Flow-through system with channelized flow between distinct inlet and outlet? START Flow-through system with channelized flow between distinct inlet and outlet? No Groundwater is primary water source? No Prone to seasonal drying under natural hydrologic regime? No Associated with lentic water body (>8 ha. and 2m. deep) No Depressional Vernal Pools Many pools hydrologically interconnected Yes No Vernal Pool System Individual Vernal Pool 21 Yes Yes Lacustrine Marine not appropriate for CRAM Evidence of strong freshwater influence? No Seasonal Estuarine Foreshore and Channel banks dominated by salttolerant plants? Yes No Yes Saline Estuarine Estuarine Is hydrology tidal at least 11 months most years? Yes No Non-saline Estuarine
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Laurel % Steve Landscape Joshua Ave
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(CRAM) For Wetlands User's Manual Version 5.0.2

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