During post-excavation study, this feature was reinterpreted as a linear stone feature in Space 1A-1. SU 2393/2513 runs parallel to 2394/2514, west to east, and appear to be a continuation of 2497's southern extension. It is one of the earliest built features post-dating Gabii's urban grid.
I believe that it is likely that this drainage feature belongs to an earlier phase of the Area C house in associated with the central drainage feature 2493 and was reused in the floor leveling for SU 2253.
The SU is a drainage channel. It is associated with the construction of floor 2253, probable a continuation to the east of drainage feature 2493 and 2494 that was excavated in 2015. It potentially also connects with the large central drainage feature in the courtyard.
Loose brown deposit between linear features 2513 and 2514
Compact light grey deposit N. 2240, S. 2513, Linear feature of tufo and travertine N. of 2240 S. of 2514, Linear feature of tufo N. of 2513 in Room 1
Linear feature of tufo and travertine N. of 2240 S. of 2514 and Linear feature of tufo N. of 2513 in Room 1