There are two main reasons causing the errors in collecting data throughout this experiment. The first major error might come from the human error who conducting the experiment. This error can be seen clearly during the reading of fluctuating values that shown from the manometer so, it is hard for the person in charge to collect the data precisely. The time taken might also give effect to the data due to the wrong assumption that made by human which causing the time to have laps when using the stopwatch. The time taken might be happened due to the parallax error which is slightly happens during taking the reading from the measuring cylinder when the water is filling the lower tab with different flow rate.