Aquatic habitat or in-channel habitat is the portion of the stream channel or river that is wetted during any given period. Throughout most of the year this “wetted area” is defined by the low-flow channel that is sustained by upstream sources and a connection to groundwater. Seasonal high-flow events, and the subsequent periods of higher stage flow temporarily connect areas of suitable habitat and mobilize gravel, cobbles, and boulders in the bed, flushing away sand and creating and redistributing habitats utilized by Covered Species in the Planning Area including the Santa Ana sucker, arroyo chub, and southwestern pond turtle.