Hello, I am a new scholar. Could you please tell me how to determine the position of the demand node when the WEAP model is generalized? Can I place it at will?

As long as you are not asking WEAP to calculate water quality, the exact location of your demand sites is unimportant. What IS important is that they are in the correct positions relative to each other. As in all models, we are limited by the data available. You should arrange the relative positions of the withdrawals and returns of your demand sites according to the most accurate data available to you.

Thank you for your answer. I understood