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The National Emergency Management Agency, the NEMA(2012) in Korea has proposed regional target rainfall with 1, 2 and 3 hour rainfall duration for all 168 counties of our country to enhance regional disaster prevention performance. The proposed regional target rainfall may be defined as the amount of rainfall corresponding a minimum of disaster prevention performance. Target rainfall with 1 hour duration has been suggested for the conveyance facilities and 2 and 3 hour target rainfall for storage facilities and watershed measures. However, some question for applying duration of target rainfall has been raised. Thus, in this study rainfall - runoff simulations by the SWMM for selected 10 sample municipal districts have been conducted to determine applicability of rainfall duration proposed by the NEMA in Korea. Since the peak flow by 1 hour rainfall may be almost same as the peak flow by critical rainfall duration for 10 sample basins, 1 hour rainfall duration in stormwater sewer districts may be selected as design rainfall duration. Furthermore,water level of stormwater storage and detention pond of drainage pumping system by 2 hour or 3 hour rainfall might be almost same as the water level by critical rainfall duration. In addition the critical rainfall durations from the designed 114 projects have been collected with the size of watershed and the durations of design rainfall. According to the analysis of watershed area and critical duration, 2 hour or 3 hour rainfall duration may be used as design rainfall duration for 5 km 2below watershed area. It has been shown that 1, 2 and 3 hour target rainfall including rainfall distribution proposed by the NEMA in Korea may be used to estimate and to improve the integrated disaster prevention performance in urban area of interest. |
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