| SYS-REQS-001 | The Water Treatment Plant SHALL produce finished water with turbidity not exceeding 0.3 NTU in 95% of monthly measurements and never exceeding 1.0 NTU, measured continuously at the combined filter effluent. | — | system, water-quality, session-206 |
| SYS-REQS-002 | The Water Treatment Plant SHALL treat a sustained flow of 50 ML/d through the complete treatment train at design water quality, and 75 ML/d for durations up to 8 hours with all treatment trains in service. | — | system, capacity, session-206 |
| SYS-REQS-003 | The Water Treatment Plant SHALL provide a minimum UV dose of 40 mJ/cm2 for Cryptosporidium inactivation and maintain a chlorine CT value of at least 6 mg-min/L at the chlorine contact chamber outlet for 4-log virus inactivation at all operating flows. | — | system, disinfection, session-206 |
| SYS-REQS-004 | The Water Treatment Plant SHALL continuously monitor turbidity at each individual filter effluent, combined filter effluent, and settled water; chlorine residual at pre- and post-disinfection points; and pH at coagulation, post-lime, and finished water points, with all measurements recorded at intervals not exceeding 1 minute. | — | system, monitoring, session-206 |
| SYS-REQS-005 | The Water Treatment Plant SHALL maintain a minimum treatment capacity of 35 ML/d with any single sedimentation basin, filter, or disinfection unit out of service for maintenance. | — | system, redundancy, session-206 |
| SYS-REQS-006 | When utility power is lost, the Water Treatment Plant SHALL transfer to emergency diesel generation within 10 seconds and sustain essential treatment and pumping loads for a minimum of 72 hours without fuel resupply. | — | system, power, session-206 |
| SYS-REQS-007 | The Water Treatment Plant SHALL detect chlorine gas leaks at concentrations not exceeding 1 ppm and activate emergency ventilation and audible/visual alarms within 5 seconds of detection in all sodium hypochlorite storage and dosing areas. | — | system, safety, session-206 |
| SYS-REQS-008 | The SCADA system SHALL present all process variables, equipment status, and alarm conditions on operator workstations with a maximum data latency of 2 seconds from field instrument to screen display, and SHALL retain all process data for a minimum of 5 years. | — | system, scada, session-206 |
| SYS-REQS-009 | The Sludge Handling Subsystem SHALL dewater alum sludge to a minimum of 18% solids content and return all supernatant and filtrate to the plant headworks with suspended solids concentration not exceeding 200 mg/L. | — | system, sludge, session-206 |
| SYS-REQS-010 | The Water Treatment Plant SHALL consume no more than 0.4 kWh of electrical energy per cubic metre of treated water at average daily flow, including all treatment processes, pumping, and ancillary loads. | — | system, energy, session-206 |
| SYS-REQS-011 | The Raw Water Intake Subsystem SHALL deliver raw water at a flow rate of 580 to 870 L/s to the treatment plant headworks while screening debris larger than 6mm and excluding fish, with intake structure designed for raw water turbidity events up to 200 NTU. | — | system, intake, session-206 |
| SYS-REQS-012 | The Coagulation and Flocculation Subsystem SHALL reduce raw water turbidity by a minimum of 80% under normal conditions (raw turbidity 0.5-10 NTU) and produce settled water turbidity not exceeding 5 NTU during high-turbidity events (raw turbidity 50-200 NTU). | — | system, coagulation, session-206 |
| SYS-REQS-013 | The Filtration Subsystem SHALL produce individual filter effluent turbidity not exceeding 0.1 NTU during stable operation, with filter-to-waste capability to prevent breakthrough turbidity above 0.3 NTU from entering the clearwell during filter ripening. | — | system, filtration, session-206 |
| SYS-REQS-014 | The Treated Water Storage and Distribution Pumping Subsystem SHALL maintain discharge pressure between 350 kPa and 700 kPa across two pressure zones, with surge pressure not exceeding 110% of steady-state operating pressure during pump start/stop transients. | — | system, distribution, session-206 |
| SYS-REQS-015 | The SCADA system SHALL implement ISA-18.2 compliant alarm management with a maximum sustained alarm rate not exceeding 6 alarms per operator per hour during normal operation, and SHALL provide distinct alarm priorities (critical, high, medium, low) with escalation procedures for unacknowledged critical alarms. | — | system, scada, alarm, session-206 |