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Average Demand Calculation and Fire Flow

My model is fine and everything works fine however the design criteria for demand is 2.1 multiply by the average demand  + Fire Flow (as indicated in the snapshot)
I have setup the Scenarios and alternative for this criteria based on the BASED DEMAND (as PHASE 5_UNSPLIT_OPTION A_BASE_DD as shown in the snapshot)
My Question are as follows
1. I am going to multiply the all the base demand for each nodes (junctons) with 2.1 to achieve the new demand alternative (average demand  + Fire Flow)
2. Create a snapshot for the time when average demand occur in the model and multiply this by 2.1 
3. I need clarification and best method to set this up
4. Which of these element is better to use for fire flow analysis Junction or Hydrants
Thanks 
Mayowa