TITLE:
Effect of Flood Peak Discharge Control by a Small Reservoir in an Urbanized Area—Case Study in the Kurabe River Basin, Japan
AUTHORS:
Kouzo Ito, Manabu Segawa, Hiroshi Takimoto, Toshisuke Maruyama
KEYWORDS:
Flood Control Reservoir, Discharge from Urbanized Area, Unit Flood Discharge, Peak Discharge Decreasing Ratio, Simulation of Drainage Discharge
JOURNAL NAME:
Open Journal of Modern Hydrology,
Vol.7 No.4,
October
31,
2017
ABSTRACT: Recently severe damage of flooding by urbanization
was frequently occurred. To prevent this damage, small reservoir was
constructed in the urbanized residential area. This paper describes an effect
of flood peak discharge control by a small reservoir (control reservoir) caused
by rapidly developed urbanization. Although work for this purpose was conducted,
research on the effects of the control reservoir was not conducted until now.
This research, conducted by simulation, was a case study in the Kurabe River
Basin in the Tedori River Alluvial Fan Area, Japan, based on the precise
investigation of the reservoir in the actual field. The study was conducted to
determine not only the actual control reservoir capacity for the newly
developed residential area but also the ideal capacity for all present
residential areas and the largest capacity allowable for a maximum rainfall
event that recently occurred. The control reservoir effects between individual
blocks and the entire basin area were compared by dividing the test basin into
15 blocks (sub-basins). The results showed that the effects on the capacity per
unit area of the residential area in blocks have close relationship with the decreasing
ratio of peak discharge in blocks. Consequently, the effects of
control reservoir capacity and the limitation were clarified. In the
future, control reservoirs should be constructed for all of the already
developed residential areas, for example, by utilizing underground car parking lot.
The results of this research can contribute to the design of the control
reservoir for protection against flooding damage in urbanized areas.