Water flow rates and pressures should be monitored and optimized regularly in water-cooled HVAC systems to ensure optimal performance and efficiency. The frequency of monitoring and optimization depends on various factors, including system size, operating conditions, and water quality. As a general rule, building operators should monitor water flow rates and pressures at least monthly, and optimize them quarterly or semiannually. However, more frequent monitoring and optimization may be necessary in systems with high water consumption or those operating in extreme climates.