Potential changes in operating conditions over the design life of the project need to be taken into account at the project design phase because:
A Creating new operating conditions at the construction or O&M phases will likely be more costly.
B These changes in operating conditions may be large enough to significantly affect the performance of the project.
C It is not possible to apply "soft" engineering solutions effectively during the operations and maintenance phase of the project.
D The use of new materials, including recycled materials, introduced in the construction phase will improve operating efficiency.