When modelling a surge tank it is necessary to dictate the initial level. When the steady state conditions are calculated, this seems to not affect the surge tank initial level, even if it does not match the head at the point on the line where it is installed. This causes a problem when the transient is run, as the tank level is 'released', which can create it's own transient if you have slightly miss-calculated the level because of the affect of friction.
It is difficult to know exactly what the head should be at a surge tank on a long waterway due to the friction. Is it possible for hammer to work out what the initial setting should be to avoid this?
Kind regards