논문

With the requirement of better quality of life, the more facilities for recreation and leisure are needed. The development projects, therefore, are currently being constructed or planned with an unprecedented matter.
In the view of disaster prevention, the development project induce the increase in runoff quantity due to impervious area and its increased quantity flows through the downstream basin with an floong risk.
To estimate flooding risk due to the development, 79 stations of Direct Jurisdiction rivers and 10 cases of development size are selected.
The ratio for the increse of runoff quantity and design flood quantity are used to relative flooding risk with different chracteristics of each river.
In these results, 2% of increasing ratio predominate over the cases and its criteria was applied to The Disaster Impact Assessment Program, enacted in July, 1996.
To secure the safety for flooding in whole downstream area, the measures for reduction of runoff increase due to the development must be established.