sir

the above case is so important in case of surge protection of tail race tunnel and head race tunnel. Also, now a days most of the hydropower plants, the surge tank has been replaced with SURGE GALLERY (IT IS JUST LIKE LONG PIPE OF HAVING DIFFRENT ELEVATIONS ALONG THE CHAINAGE AND OPEN TO ATMOSPHERE OR JUST LIKEA RISING MAIN IN PUMPING SYSTEMS). THIS PROBLEM CAN BE REPLACED WITH VARIABLE TANK OPTION IN SURGE TANK ELEMENY PROPERTIES. BUT THERE IS A PROBLEM THAT THE %VOLUME SHOULD BE IN INCREASING ORDER. OTHERWISE PROGRAM NOT EXECUTING.