A Study on Setting Disaster-Prevention Rainfall by Rainfall Duration in Urban Areas Considering Natural Disaster Damage: Focusing on South Korea

Abstract

Inundation damage occurs in urban regions due to short flood reach time and increased surface runoff caused by urbanized impervious areas. Furthermore, heavy rainfall frequency has increased because of climate change, thus exceeding the design frequency and resulting in sewer pipes’ lack of flood control capacity, with damage expanding from low-lying areas. Despite many urban disaster-mitigation policies, complex causes and uncertainties make reducing urban inundation damage difficult. This study established a rainfall-related disaster-prevention standard by time duration considering rainfall characteristics targeting urban disaster-induced inundation damage. Based on the South Korean urbanization rate and population, seven target regions were selected. Rainfall by time duration was analyzed with respect to disaster length (number of days) from 2010–2017. The average rainfall for durations from 1–24 h were analyzed according to disaster length (1–13 days). Using the results, an equation was proposed for rainfall estimation by length of disaster resulting in urban inundation damage, through multiple regression analysis. An equation was developed for rainfall-related disaster-prevention in urban areas considering the length of disaster and rainfall duration. This was accomplished by selecting a duration whereby the average rainfall of duration corresponded to 50% of total rainfall during the disaster period.

Potential flooding in the APT Pranoto Samarinda Airport area as a result of the airport runway extension

“…City development will be accompanied by population growth and increased land use to fulfill settlements, business land, offices and other supporting infrastructure land needs. The increase in impermeable area caused by the prevalence of asphalt and cement, combined with frequent heavy rains in a short time due to climate change resulted in increased runoff and faster flood reach times [1].…”

Long-Term Rainfall Variability and Trends for Climate Risk Management in the Summer Monsoon Region of Southeast Asia

“…It serves as a crucial indicator for studying the impacts of climate change, as the spatial distribution of rainfall directly infuences global temperature fuctuations. Variations in rainfall intensity and magnitude are key indicators of changes in food occurrences, drought events, and exceptionally dry or wet seasons, which can result in signifcant harm to ecosystems, plant and animal life, property, and food security through declines in agricultural output [5][6][7]. Moreover, investigating macrolevel variables and trends in rainfall is essential for researchers examining extensive geographic areas such as river basins, countries, or regions, enabling the exploration of sustainable solutions for food control and drought mitigation [8][9][10][11][12].…”

A Case Study of the Retention Efficiency of a Traditional and Innovative Drainage System

“…Urban floods, which are caused by high-intensity short-term rainfall, are generally local [18][19][20]. It is worth emphasizing that the collectors located outside the flooded area are often not used effectively in terms of hydraulics and have, in the upper zone, free spaces, sometimes of considerable capacity, which can be successfully included in the retention volume of the entire drainage system [21][22][23].…”