While carrying out this expansion work, he assembled rocks and reconfigured the channel to control the water level at the end of the flow, which resulted in the water course becoming completely dammed and causing it to pool as a pond.
拡張と同時に流末に水位調節のために石組み溝が新たに設けられ、これによって流路全体がせき止められて池状のたまりとなっていた。