Additionally, since the Nishitakase-gawa River crosses over the divide between the Katsura-gawa River and the Kamo-gawa River and its flow path has been modified to run (upstream) towards the Tenjin-gawa River from Nishioji-sanjo and the east, the canal is either full of accumulated rain water or dry in the section from the Tenjin-gawa River to the vicinity of the drainage in Sanjo-dori Street.
さらに、西大路三条付近で桂川と鴨川の分水嶺を越えることになる上、西大路三条以西は天神川に向かって（上流に向かって）流れるように改修されたこともあって、天神川～三条通の暗渠部あたりまで、溜まった雨水が流れる程度、もしくは干上がった状態になっている。