Table 5 

 Hydrologic Zones* - Nontidal Areas 



Zone 



Name 



Duration** 



Connnents 



it Permanently inundated 



II Semipermanently to nearly 

 permanently inundated or 

 saturated 



III Regularly inundated or 

 saturated 



IV Seasonally inundated or 

 saturated 



V Irregularly inundated or 

 saturated 



VI Intermittently or never 

 inundated or saturated 



100% Inundation >6.6 ft mean 

 water depth 



>75% - <100% Inundation defined as 



<6.6 ft mean water depth 



>25% - 75% 



>I2.5% - 25% 



>5% - 12.5% Many areas having these 



hydrologic characteristics 

 are not wetlands 



<5% 



Areas with these hydrologic 

 characteristics are not 

 wetlands 



* Zones adapted from Clark and Benforado (1981). 

 ** Refers to duration of inundation and/or soil saturation during the growing 

 season, 

 t This defines an aquatic habitat zone. 



the upper limit of each hydrologic zone shown in Table 5. This program is 

 available upon request.* 

 Wetland indicators 



49. Indicators of wetland hydrology may include, but are not neces- 

 sarily limited to: drainage patterns, drift lines, sediment deposition, 

 watermarks, stream gage data and flood predictions, historic records, visual 

 observation of saturated soils, and visual observation of inundation. Any of 

 these indicators may be evidence of wetland hydrologic characteristics. 

 Methods for determining hydrologic indicators can be categorized according to 

 the type of indicator. Recorded data include stream gage data, lake gage 

 data, tidal gage data, flood predictions, and historical records. Use of 

 these data is commonly limited to areas adjacent to streams or other similar 



* R. F. Theriot, Environmental Laboratory, US Army Engineer Waterways 

 Experiment Station, P.O. Box 631, Vicksburg, Miss. 39180. 



36 



