Uncertainties and trends in extreme rainfall series in Tuscany, Italy: Effects on urban drainage networks design

1998 ◽  
Vol 37 (11) ◽  
Keyword(s):  
Extreme Rainfall ◽  
Rainfall Series ◽  
Urban Drainage ◽  
Drainage Networks

Uncertainties and trends in extreme rainfall series in Tuscany, Italy: effects on urban drainage networks design

1998 ◽  
Vol 37 (11) ◽  
pp. 195-202 ◽  
Author(s):  
S. Pagliara ◽  
C. Viti ◽  
B. Gozzini ◽  
F. Meneguzzo ◽  
A. Crisci
Keyword(s):  
Arima Model ◽  
Gumbel Distribution ◽  
Extreme Rainfall ◽  
Rainfall Series ◽  
Annual Rainfall ◽  
Urban Drainage ◽  
Basin Management ◽  
Design Storm ◽  
Drainage Networks ◽  
Reliable Design

Sound basin management at urban or greater scale needs reliable design storm definition. A statistical analysis is carried out on extreme annual rainfall series for durations of 1, 3, 6 and 12 hours occurring at two gauges in Tuscany, Italy. Kendall's test is applied to the extremal series to detect a definite increasing (or decreasing) trend. A special form of an ARIMA model is also fitted to the series to quantify possible linear trends and their respective significance. Results show a clearly increasing trend at shortest duration at both gauges, no trend at longer ones. Time evolution of design storms for all durations and return periods up to 25 years is derived and analysed based on Gumbel distribution. Applications are presented concerning impacts of uncertainties for the design of urban drainage networks.

Are extreme rainfall intensities more frequent? Analysis of trends in rainfall patterns relevant to urban drainage systems

2009 ◽  
Vol 59 (9) ◽  
pp. 1769-1776 ◽  
Author(s):  
S. De Toffol ◽  
A. N. Laghari ◽  
W. Rauch
Keyword(s):  
Short Duration ◽  
Scientific Community ◽  
Daily Rainfall ◽  
Extreme Rainfall ◽  
Kendall Test ◽  
Alpine Region ◽  
Rainfall Series ◽  
Urban Drainage ◽  
Rain Event ◽  
Total Rainfall

The fact that climate change is affecting the intensity and frequency of rainfall is well accepted in the scientific community. This is backed by a multitude of reports on the basis of daily rainfall series analysis; however, little research is available for short duration intensities. Due to its significant influence on the behaviour of urban drainage, it is critical to investigate the changes in short duration rainfall intensities. In this study different intensities relevant for the urban drainage and the total rainfall per rain event are analysed. The trend is investigated using the Mann-Kendall test. The rainfall series analysed are from the alpine region Tyrol. The results present differences depending on the duration of the intensity and the series considered, however an increase in the number of extreme events is detectable for short durations for the most series.

scholarly journals Creation of an SWMM Toolkit for Its Application in Urban Drainage Networks Optimization

Water ◽  
2016 ◽  
Vol 8 (6) ◽  
pp. 259 ◽  
Author(s):  
F. Martínez-Solano ◽  
Pedro Iglesias-Rey ◽  
Juan Saldarriaga ◽  
Daniel Vallejo
Keyword(s):  
Urban Drainage ◽  
Drainage Networks

100 years of Belgian rainfall: are there trends?

2002 ◽  
Vol 45 (2) ◽  
pp. 55-61 ◽  
Author(s):  
G. Vaes ◽  
P. Willems ◽  
J. Berlamont
Keyword(s):  
Extreme Rainfall ◽  
Rainfall Series ◽  
Strong Increase ◽  
Final Conclusion ◽  
Small Decrease ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
Flooding Frequency ◽  
Small Aggregation ◽  
Aggregation Level

In 1999 the digitisation of old rainfall records of measurements at Uccle (Belgium) was completed, which resulted in a unique rainfall series of 100 years (period 1898-1997). This is an ideal opportunity to search for trends in the rainfall over the last century. Large variations in rainfall probability over the century have been observed. For small aggregation levels there is a small decrease in extreme rainfall events over the century. For large aggregation levels there is a more explicit increase in extreme rainfall. Because the rainfall on seasonal aggregation level is only slightly increased, the increase in extreme rainfall events for aggregation levels between a few days and a few months can only occur due to larger clustering. However, the final conclusion is that no significant trend can be observed. A pure random variation of the rainfall can cause equally large variations. This does not exclude a possible trend in flooding frequency, due to the strong increase in urbanisation over the last century.

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