5.31Extra for laying reinforced cement concrete in or under water and/ or liquid mud, including cost of pumping or bailing out water and removing slush etc., complete. Note For Item No. 5.31:- The quantity will be calculated by multiplying the depth measured from the subsoil water level up to the centre of gravity of the R.C.C. under subsoil water with the quantity of R.C.C. in cubic metre executed under subsoil water. The depth of centre of gravity shall be reckoned correct to 0.1 m (0.05 m or more shall be taken as 0.1 m and less than 0.05 m ignored). No extra payment shall be made for placing reinforcement or centering & shuttering under sub - soil water conditions.