[sulfi_alimk]

Right now I am working for Re measured infrastructure project. In this we have some different type of utilities like storm water, potable water etc . The measurement is based on CESMM3 and FIDIC. My question is while taking Chamber depth what is depth criteria.
I mean CESMM-3 clearly specifying that the measurement should be from Cover level to top of base slab or invert level of bottom pipe whichever is lower. But in project preamble is specifying for the depth chamber should be from cover level to invert level of chamber (Not invert level of pipe). But the consultant is saying invert level chamber means invert level of bottom pipe and not top of base slab. Please suggest me what is invert level chamber as per CESMM3. Your immediate response highly appreciated.