The Effect of Design Rainfall Patterns on Urban Flooding Based on the Chicago Method

Abstract

Design rainfall is the basis for deriving design floods in areas where rainfall data are lacking and has a significant impact on the construction of water engineering facilities and municipal engineering designs. The Chicago rainfall pattern method has great applicability for urban short-duration design rainfall. In order to analyze the influence of design storm rainfall patterns on urban flooding, numerical models of hydrological and hydrodynamic processes were applied to simulate design rainfall with different recurrence periods and different rain peaks and were also used to compare and analyze the total amount of water accumulation and inundation extent by taking the central city of Zhoukou as an example. The results show that when the design rainfall recurrence period is less than 20 years, the total volume and inundation extent of waterlogging in design rainfall with a smaller peak ratio is larger. When the return period is greater than 20 years, the pattern is reversed. However, as the return period grows, the difference in peak inundation volume due to different peak rainfall amounts decreases. This study has certain guiding significance for urban flood forecasting and early warning efforts.

Scenario-Based Simulation of Impervious Surfaces for Detecting the Effects of Landscape Patterns on Urban Waterlogging

“…Compared with the actual peak rainfall process, the characteristics of single-peak and rapid fluctuations are similar to those of disastrous heavy rainstorms. The Chicago method is widely used in rain pattern analyses because of its high accuracy and universality [41,42]. The designed rainfall of this study combines the rainstorm intensity formula of Lin'an City and the Chicago rain pattern.…”

Impact of Different Design Rainfall Pattern Peak Factors on Urban Flooding

“…Rainfall mostly occurs in the form of heavy rainfall. Rainfall patterns produce fast flow rates, which tend to cause high peak flows of rainwater runoff and generate high pressure on drainage systems, making them susceptible to natural disasters, such as flooding, waterlogging and erosion [26].…”

Rainwater management by “green” roofs on the example of trade-business centre “Perekhrestia”, Dnipro city

“…Вони переносять сміття, бактерії, важкі метали та інші забруднювачі через зливову каналізацію в місцеві водні шляхи. Сильні зливи можуть спричинити повені, які завдадуть шкоди майну та інфраструктурі [17].…”