This study aims to clarify the key factors for promoting the urban development projects in Toyohashi during 1907-1914, focusing on the strategic plan through public-private collaboration. By analyzing the process of three projects: the construction of road, the relocation of a red-light district and the permission of the licence to build an electric tramway, the followings are found out. Firstly, Toyohashi city government relocated a red-light district from city centers to Azumada in the eastern suburbs of Toyohashi in the prospect of large profits that came from the purchase and lease of land. As a result of this, one can see that Toyohashi city intended to cover the road construction cost for its own incomes in terms of the urban management. Secondly, some directors of Toyohashi electric Co., Ltd. applied for the licence to build Toyohashi electric tramway, which connected Toyohashi station, city centers and Azumada red-light. Furthermore, the route of Toyohashi electric tramway extending to the south of the city seemingly targeted soldiers. At the time when the application was granted regardless of the high construction cost, some out-of-city businessmen already took a capital participation in Toyohashi electric Co., Ltd. The directors of Toyohashi electric Co., Ltd. also involved in the relocation of a red-light district. The above facts suggest that Toyohashi electric Co., Ltd. planned a red-light district and an electric tramway in order to create power demand. Lastly, we have concluded that the key factors for promoting three projects: road, a red-light district and an electric tramway must be the common strategy in which Toyohashi with a small capitalization developed as a modern city by the public and private sectors working in coordination with each other.
This study examined the “Nanki Tokugawa-Shi”, which summarizes the records of the Kishu Clan in the Edo Period. Based on descriptions contained in the “Nanki Tokugawa-Shi”, 45 articles on social infrastructure maintenance were extracted. These 45 articles examined 15 social infrastructure developments. The results showed that there are numerous descriptions of developments related to new rice fields. In addition, many articles were related to the excavation of new irrigation canals, and irrigation facilities. Most of the records were related to floods and the extent of damage caused. Furthermore, there were numerous articles on the remarkable achievements of Saizo Ohata, including the construction of a long canal in the Kishu Domain. However, there were very few articles in the “Nanki Tokugawa-Shi” on Yasobe Tamenaga Izawa who was appointed by the Kishu Clan to the Edo Shogunate.
The ancient record of Izumo Fudoki (edited in 733) is not only almost complete book, but also contains detailed geographic data (surveying data) not found in the others. Among them, the sizes (lengths) of two lakes are shown. Usually, the sizes (lengths) of lakes are thought as the perimeters in Japanese. However, they do not match the perimeters based on geological estimation. We explore the reasons for the inconsistency based on previous studies, then inferred that it may indicate the lengths of the waterways. It is a practical display to make the tour schedules.