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Demand Pattern Calculation and Allocation

Hi. I am fairly new to modelling. Therefore, having many question related to the model building as well as understanding proper ways to carry out modelling. 

Here is what I have and what I did. 

1. Customer meter with billing data, laterals, taps.  - All the data is imported into the model and the model is built. 

2. Two inlets having a known flow values in  5 meter interval, along with the pressure - These inlets are modelled as Reservoirs. The Pressure values are used to calculate the HGL and then Reservoir HGL Pattern is created and assigned to each of the inlet reservoirs respectively. 

3. Pressure Loggers inside the DMAs. 

For creating the demand pattern, I used the inlet flow data and created a multiplier for each of the inlet. Have created the hydraulic pattern of the same in WaterGEMS

I assigned one of this multipliers to all the customer demand nodes. 

Also note that, I have calculated the Losses  by [Water supplied - (Water Billed per month/30 days) ]. 

 Then I calculated the losses per customer meter and added that value to all the meters. 

Question: 

1. Is the method of calculation of the demand pattern correct? If not, please suggest a correct way to arrive on it. 

2. In case of multiple inlets, how do I know which inlet is supplying to which part of the network, and thereby how do I know which hydraulic pattern to be assigned to which customer? 

 

 Thanks for bearing me.