Table 1 



Hydrologic Zones Occurring in Bottomland Forests 

 of the Southeastern United States 



12 



Zone 

 2 



Name 



Semipermanently to 

 permanently inun- 

 dated or saturated 



Regularly inun- 

 dated or saturated 



Seasonally inun- 

 dated or saturated 



Irregularly inun- 

 dated or saturated 



6 Intermittently 

 inundated or 

 saturated 



Typical Duration 15 



Inundation/Saturation Frequency 3 (percent) 



Annual (1 year frequency) >75-100 

 90 to 100 years/100 years 



51 to 90 years/100 years 



(>l-year to 2 -year frequency) >25-75 



51 to 90 years/100 years 



(>l-year to 2-year frequency) >12.5-25 



11 to 50 years/100 years (well >5-12.5 

 drained) (>10 years - 2-year 



frequency) 



1 to 10 years/100 years (poorly 

 drained) (100 years, 10-year 

 frequency) 



1 to 10 years/100 years <5 



(100 years, 10-year frequency) 



Source : Adapted from Larson et al . (1981). 



a Although typical inundation/saturation frequencies are provided 

 for each zone, almost any frequency could be associated with any 

 duration of inundation/saturation. Therefore, only duration of 

 inundation/soil saturation was used to determine hydrologic 

 zones . 

 b Duration based on the growing season. 



remaining daily readings during the period of record from highest to 

 lowest flow (or stage). Elevations corresponding to the 75, 25, 12.5, 

 and 5 percent durations of inundation were computed. Because the 

 resulting elevations did not include the period during which the soils 

 remain saturated after a period of inundation, saturation effects were 

 integrated. A general description of the soil series occurring in each 

 zone of the study site was obtained from Soil Conservation Service (SCS) 



