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fire flow analysis at max hour

Hello,

i'm doing the design of potable water and fire fighting network as combined network for a new site, 

we are studying two scenarios (MAx daily + fire) and (Max hourly). because it is too big site (7,000,000 m2) the peak design is the Max hourly flow.

i'm trying to study the fire flow analysis in the scenario of (Max daily + fire) and the hydraulic of the network (pressure and velocities) in the second scenario (Max hourly)

we are proposing three main DMA's, according to my previous study in water losses management we should add the entrance of each DMA with a PRV to sustain the pressure at minimum value for better leakage management. but when i used the PRV's it affected the fire flow analysis

do i follow the right methodology for such case?

note: according to the client requirements, we are assuming fire flow at each junction of the network

Regards