Susceptible | Non-Susceptible | ||
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Highly Susceptible Wetland Types 1 | Moderately Susceptible Wetland Types 2 | Slightly Susceptible Wetland Types 3 | Least Susceptible Wetland Types 4 |
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1. Special consideration must be given to avoid altering these wetland types. Inundation must be avoided. Water chemistry changes due to alteration by stormwater impacts can also cause adverse impacts. Note: All scientific and natural areas and pristine wetlands should be considered in this category regardless of wetland type. 2a, 2b, 2c. Can tolerate inundation from 6 inches to 12 inches for short periods of time. May be completely dry in drought or late summer conditions. 2d. Can tolerate +12” inundation, but adversely impacted by sediment and/or nutrient loading and pro- longed high water levels. 2e. Some exceptions. 3a. Can tolerate annual inundation of 1 to 6 feet or more, possibly more than once/year. 3b. Fresh meadows which are dominated by reed-canary grass. 3c. Shallow marshes dominated by reed-canary grass, cattail, giant reed or purple loosestrife. 4. These wetlands are usually so degraded that input of urban stormwater may not have adverse impacts. Notes: There will always be exceptions to the general categories listed above. Use best professional judgment. Pristine wetlands are those that show little disturbance from human activity.