These are part of the canal system.
The cut-stone blocks are faced at the top and rusticated at the bottom; a few paving stones survived on top. The blocks themselves are similar in almost all ways to the stones of the aqueduct at jerkin, with the exception of inscriptions. Ur & Reade 2015
Ur & Reade 2015
Ur, Jason and Julian Reade. 2015. The Hydraulic Landscape of
Nimrud. Mesopotamia 50: 25-51. http://nrs.harvard.edu/urn-3:HUL.InstRepos:29335964