Based on the position of this cut within Room 5 - directly over the beginning of the drain structure (7201) - it seems likely that it was created by some kind of spoliation activity, perhaps to extract a basin or other higher-value feature related to the need for a drain below.
The cut features a channel cut down the center with a circular cut feature on the southern limit. The channel appears to have been a water feature likely used far drainage with the southern circular cut serving as a drain. The channel likely continues running north-south with offshoot drainage features to the east and west.
Cut into SU 7150 in center of Room 5
Concrete wall running E-W at S limit of Room 5; Concrete wall running N-S at W limit of Room 5; Concrete wall running E-W at SW corner of Room 4; Stone threshold between Rooms H4 and H5; Concrete wall running E-W at SE corner of Room 4; Stone threshold between Rooms H4 and H5; Long ashlar wall running N-S at eastern limit of rooms 4, 5, and 6; Four large square tufo blocks along E wall of Room 5; Line of small stones along W face of blocks 7198; Cut into SU 7150 E of wall 7117; Fill of cut 7155; Cut into SU 7150 in center of Room 5; Fill of cut 7151
Model of Rooms H4 and H5
View from northeast
View from south
View from north