what units are flows reported in?

[usepa]

what units are flows reported in?

[kaklise]

The table references unit conversions for EPANET INP files. Data that is stored in a WNTR water network model and the results from a simulation (EpanetSimulator or WNTRSimulator) are all in SI units. Flowrate is in m^3/s. I see that flowrate is not listed at the top of that page, we'll fix that.

[tyjchen]

sorry i just had a follow up question, you mention all data is in SI units. so should I be writing my pipe diameters in M? and not mm as shown in the conversion table?

https://wntr.readthedocs.io/en/latest/units.html

[michaelbynum]

@tyjchen Good catch. There is a typo in that table. Diameter should be in meters. We will get that fixed.

[michaelbynum]

@tyjchen Please disregard my last comment. I spoke too quickly. There is not a typo. The table you are referencing specifies units for Epanet inp files. Pipe diameters should indeed be specified in mm. However, once the model is loaded into a WaterNetworkModel object, pipe diameters are all in meters as specified here https://wntr.readthedocs.io/en/latest/units.html#units. Does that make sense?

[tyjchen]

@michaelbynum thanks for the response, i'm still a little unsure of what the "right" units are. just to make sure: when an existing .inp file is read the diameters are converted automatically from from inches to meters. if i want to add say a new pipe of 10 inches to the model (using wntr.add_pipe()), i should also use meters?
or should i convert the diameters in the existing model from M to mm?

[michaelbynum]

When using wn.add_pipe(), diameter should be specified in meters. At the very top of the previously mentioned webpage (https://wntr.readthedocs.io/en/latest/units.html#units), there is a bulleted list of units. These are the units used in WNTR. Anytime you interact with WNTR python objects, you should use these units. Table 4 on the same page is only for inp files.

[tyjchen]

@michaelbynum thank you!