scholarly journals The potential for natural flood management to maintain free discharge at urban drainage outfalls

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
Charlie R. Ferguson ◽  
Richard A. Fenner
Keyword(s):  
Flood Management ◽  
Urban Drainage ◽  
Free Discharge

The effects of non-stationarity on the evaluation of critical design storms

1998 ◽  
Vol 37 (11) ◽  
pp. 187-193 ◽  
Author(s):  
C. De Michele ◽  
A. Montanari ◽  
R. Rosso
Keyword(s):  
Daily Rainfall ◽  
Extreme Value Distribution ◽  
Flood Management ◽  
Extreme Value ◽  
Urban Drainage ◽  
Drainage Systems ◽  
Design Storm ◽  
Critical Design ◽  
Urban Drainage Systems

The critical storm is generally carried out to design urban drainage systems and other flood management works starting from the available historical information. Its evaluation associated with a fixed return period is usually obtained by fitting the annual maxima of the rainfall depth with an extreme value distribution. This statistical procedure, however, leads to dubious results when the data present a non-stationarity, induced for example, by a long-term variability. To assess the effects of non-stationarity, four daily rainfall series observed in Italy, with at least 90 years of continuous data, are analysed here. For each record and each year of the observation period, critical design storms are estimated fitting the annual maxima collected in the past, so allowing us to assess the progress of the design storm along time. Four different extreme value distributions are used. The results show that an analysis of non-stationarity is required when urban drainage systems and other hydraulic engineering works are designed.

Applying the 3-layer approach to urban flood management

2015 ◽  
Vol 24 (3) ◽  
pp. 290-305 ◽  
Author(s):  
Chen Kun Chung
Keyword(s):  
Urban Space ◽  
Extreme Rainfall ◽  
Flood Management ◽  
Historical Change ◽  
Urban Drainage ◽  
Storm Events ◽  
Water Drainage ◽  
Private Lands ◽  
Content Type ◽  
The Impact

Purpose – The purpose of this paper is to find the possibility of extending the capacity of urban drainage in highly urbanized cities with limited available space for flood management, while the anticipated increase in extreme rainfall is expected to raise the demand for higher capacity of water drainage or storage systems. Design/methodology/approach – The concept of the three-layer approach is introduced to identify the crucial factors which had impacted the historical change of natural water system. These factors can further help identifying potential spaces for new designs of flood management based on the spatial context of local history. Findings – In Pingtung case, a roadway surface drainage design is found as a complementary strategy by this method, which could effectively and practically extend the capacity of urban drainage without the need for requisitioning private lands or rearranging the complicated underground pipe and cable systems. Research limitations/implications – This is an initial exploration from the perspective of urbanism to respond to hydrological problems under the impact of extreme rainfall. The more precise hydrologic simulation need to be further established. Practical implications – This concept could be applied in delta cities to improve urban drainage by three steps: first, clarify the flooding problems; second, identify the available space; third, redesign hydrologic instrument with a multi-use of urban space. Originality/value – This research provides hydrologists and urban planners with a practical collaboration base for the issues of extreme storm events.

scholarly journals Study on the Construction Mode of Ecological and Sustainable Rain Flood in New Urban Area of China

2019 ◽  
Vol 101 ◽  
pp. 01002
Author(s):  
Caixia Kang ◽  
Qing Lu ◽  
Zhiheng Zhang ◽  
Qian Zhao ◽  
Huihui Nan
Keyword(s):  
Urban Areas ◽  
Green Space ◽  
Flood Management ◽  
Ecological Environment ◽  
Urban Drainage ◽  
Environment Protection ◽  
Urbanization Process ◽  
Ecological Protection ◽  
Construction Mode

In the background of the urbanization process has exceeded 58% of China and expansion of the construction land expansion, as a future appropriate residential development and ahead of the key area of urban rain flood management, this research expounds the new cities and new district how to follow the principle of ecological priority in different application field, and how to use land for urban green space and ecological protection for elastic development and rain flood management. The study of the new cities’ eco-rain flood management model is of great significance for the governance and sustainable development of urban diseases in China.By combining natural ways with artificial measures, planning is carried out in advance.On the premise of ensuring the safety of urban drainage and waterlogging prevention, the accumulation, infiltration and purification of rainwater in urban areas can be realized to the maximum extent, and the utilization of rainwater resources and ecological environment protection can be promoted in new cities. To make plan ahead,to avoid the problems of rain and flood in existing urban areas, and improve the livable quality of new cities greatly.New ways of thinking and construction guidance are proposed for ecological livable construction and flexible rain flood management of new urban areas in China.

scholarly journals Many-Objective Optimization of Sustainable Drainage Systems in Urban Areas with Different Surface Slopes

2021 ◽  
Author(s):  
Omid Seyedashraf ◽  
Andrea Bottacin-Busolin ◽  
Julien J. Harou
Keyword(s):  
Urban Areas ◽  
Flood Management ◽  
Urban Drainage ◽  
Unequal Distribution ◽  
Drainage Systems ◽  
Capital Costs ◽  
Surface Slopes ◽  
Urban Drainage Systems ◽  
Urban Catchments ◽  
The Impact

AbstractSustainable urban drainage systems are multi-functional nature-based solutions that can facilitate flood management in urban catchments while improving stormwater runoff quality. Traditionally, the evaluation of the performance of sustainable drainage infrastructure has been limited to a narrow set of design objectives to simplify their implementation and decision-making process. In this study, the spatial design of sustainable urban drainage systems is optimized considering five objective functions, including minimization of flood volume, flood duration, average peak runoff, total suspended solids, and capital cost. This allows selecting an ensemble of admissible portfolios that best trade-off capital costs and the other important urban drainage services. The impact of the average surface slope of the urban catchment on the optimal design solutions is discussed in terms of spatial distribution of sustainable drainage types. Results show that different subcatchment slopes result in non-uniform distributional designs of sustainable urban drainage systems, with higher capital costs and larger surface areas of green assets associated with steeper slopes. This has two implications. First, urban areas with different surface slopes should not have a one-size-fits-all design policy. Second, spatial equality must be taken into account when applying optimization models to urban subcatchments with different surface slopes to avoid unequal distribution of environmental and human health co-benefits associated with green drainage infrastructure.

scholarly journals Development of a Simulation Model for Real-Time Urban Floods Warning: A Case Study at Sukhumvit Area, Bangkok, Thailand

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1458
Author(s):  
Detchphol Chitwatkulsiri ◽  
Hitoshi Miyamoto ◽  
Sutat Weesakul
Keyword(s):  
Real Time ◽  
Water Resource Management ◽  
Drainage System ◽  
Flood Management ◽  
Rainfall Data ◽  
Urban Drainage ◽  
Flood Inundation ◽  
The Real ◽  
Inundation Area ◽  
Flood Inundation Mapping

Increasingly frequent, high-intensity rain events associated with climatic change are driving urban drainage systems to function beyond their design discharge capacity. It has become an urgent issue to mitigate the water resource management challenge. To address this problem, a real-time procedure for predicting the inundation risk in an urban drainage system was developed. The real-time procedure consists of three components: (i) the acquisition and forecast of rainfall data; (ii) rainfall-runoff modeling; and (iii) flood inundation mapping. This real-time procedure was applied to a drainage system in the Sukhumvit area of Bangkok, Thailand, to evaluate its prediction efficacy. The results showed precisely that the present real-time procedure had high predictability in terms of both the water level and flood inundation area mapping. It could also determine hazardous areas with a certain amount of lead time in the drainage system of the Sukhumvit area within an hour of rainfall data. These results show the real-time procedure could provide accurate flood risk warning, resulting in more time to implement flood management measures such as pumping and water gate operations, or evacuation.

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