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The design flow rate for fire fighting using the fire protection water supply in the event of a fire should be composed of the design flow rates of various water-based fire suppression systems that need to operate simultaneously, such as the building’s outdoor fire hydrant system, indoor fire hydrant system, automatic sprinkler system, foam fire suppression system, water spray fire suppression system, fixed fire cannon system, and fixed cooling water system. It shall comply with the following provisions: The design flow rate for fire fighting using the fire protection water supply in the event of a fire should be composed of the design flow rates of various water-based fire suppression systems that need to operate simultaneously, such as the building’s outdoor fire hydrant system, indoor fire hydrant system, automatic sprinkler system, foam fire suppression system, water spray fire suppression system, fixed fire cannon system, and fixed cooling water system. 1 It shall be determined based on the sum of the maximum design flow rates of all the water-based fire suppression systems that need to operate simultaneously； 2 When two or more buildings are used together, the design flow rate shall be determined based on the one with the highest flow rate among them ； 3 When the fire protection water supply is shared with domestic and production water supplies, the design flow rate for the combined water supply shall be the sum of the design flow rate for the fire protection water supply and the maximum hourly flow rates for domestic and production uses. In calculating the maximum hourly domestic flow rate, the water used for sprinkling should be accounted for at 15%, while water used for purposes such as watering and washing that can be stopped during a fire should not be included in this calculation. The design flow rates for water-based fire suppression systems such as automatic sprinkler systems, foam fire suppression systems, water spray fire suppression systems, and fixed fire cannon systems shall be determined in accordance with the relevant provisions of the current standards, namely the \"Design Code for Automatic Sprinkler Systems\" GB50084, the \"Design Code for Foam Fire Suppression Systems\" GB50151, the \"Design Code for Water Spray Fire Suppression Systems\" GB50219, and the \"Design Code for Fixed Fire Cannon Systems\" GB50338.