Water Source
Incoming Water Quality
Water Availability
Pressure and Flow Rate
Water Transmission
Water Discharge
  Characteristics
Pollution Regulations Emergency Requirements

Water Use
Chemical Requirements Temperature Ranges Optimized Water Quality
On-Line Time Studies Secondary Usages Supplementary Treatment Discharge Limitations
Water Re-Use Needs

Water Equipment
System Performance
  and Peak Demand
Anti Corrosion Materials
Required Safety Factors Operating Economics Expected Operating Conditions  Relative to Minimum Sizing Drain/Discharge/Piping   Evaluations
Duty-Cycle and Life Cycle   Needs
Controls Sophistication
Automatic Controls

Water Facility
Ambient Conditions Hazard/Safety Requirements Temperature Assessments Criticality of Operation Maintenance Accessibility Installation and Equipment-  
  Space Availability
System Security Needs Delivery and Storage of Supplies Pipe-Layout   Optimization
Materials Compatibility