Can you set up a model with just hydrant pressure no flow data?

Charlie,

Can you tell us a bit more about the system and what your modeling needs are? (what decisions do you need the model to help you make?)

Are you modeling a connection to an existing system? If so, see: Modeling a Connection to an Existing System

You could use the reservoir element as the water source based on the static pressure readings but there are some potential problems:

1. Pressure measured from a certain elevation, so it is better to determine the hydraulic grade. You would then use that as the reservoir elevation.
2. As flow increases, headloss will cause the pressure to drop below what you had measured with the static readings. The magnitude of the drop and whether it is a concern may depend on how large of a pipe.

Thanks,

I need to connect to an existing system (16"line) and run (a long) a dead-end run to feed an apartment complex.  At some point in the future (1-5yrs) the run will be continued and looped.  But I need to verify pressure on the system in the proposed "current" state.  My contractor didn't realize I was looking for static, residual and a flow rate and just ran static pressures.  weighing the need to make him go back to get the other information.  

Thanks for the details. As a start, you could consider using the reservoir approach and see if the flow in your model results in significant headlosses for the given pipe sizes. If headloss is significant at the connection point, that may tell you that it is worth getting the residual pressure and flow measurement so that you can use the pump curve approach mentioned in the article.

Thanks.   I think I will set up with what I have for now but schedule additional testing.

Thanks for the help!

You need to size pipes for peak demands which in most cases is fire flow on top of a peak day demand.

A static pressure reading may tell you the expected HGL on a normal day but, unless there is no head loss in the distribution system, the HGL will drop during peak flows. You need to account for that. A hydrant flow test plus the model will give you insight into what the HGL will be during those peak conditions.