Apply this to a water treatment plant

Candidate Architectures: Define a broad differentiated set of 4 to 8 system concepts that will be considered next. A hybrid of concepts is acceptable as its own concept (bridge, tunnel, island combination). These system concepts can be upgrades to existing systems, new COTS or technology driven systems, an integration of various existing technologies or approaches in a unique way, or other unique or creative system solutions.

Guidelines include:

• The concepts address the operational, functional, and performance requirements.
• Four to eight different kinds of concepts are considered; one or two can be hybrids of the other concepts.