Experts, however, have found the water's source to be two centimeters higher than the bottom, with the snaking course taken by the ditch serving to deceive the untrained eye. Furthermore, owing to the ditch's being above the highest point of the mountain road, confusion results when road and ditch meet.
經測量專家鑑定，其實水源的落差比水溝仍高上二公分，只因水行蜿蜒曲折，一般人看不到水的源頭；另方面，因為水溝正處於下坡公路的最高點，在水流與公路的交叉點觀望，很容易造成視覺的錯亂，實際上水流仍與海平面平行。