But Tanada were in the mountains, and were often located upstream of a river; as a result, in the case of a long spell of dry weather, the amount of water quickly decreased and the rice paddies dried up.
ただし、山間地にあるため河川は上流であり、日照りが続くと水量が簡単に減ってしまって水田が干上がってしまう問題があった。