The research on restoration of the past environment is called for by hydrology as well as other learning fields. Then, the restoration methods of the past hydrological environment were considered for flood in River Kamo at Kyoto as an example. First, it arranged in three types (Restoration from earth surface, Restoration from geological structure and Restoration from historical records) about the restoration methods of the flood. The outline was described about each restoration methods. About the flood of River Kamo, two examples in the Heian period and the Edo period were taken up, and the above-mentioned restoration methods were applied. When using the restoration methods of three types together, it was made to become clear with any example that the past hydrological environment could be restored certainly.
