scholarly journals Does Nonstationarity in Rainfall Requires Nonstationary Intensity-Duration-Frequency Curves?

2017 ◽  
Author(s):  
Poulomi Ganguli ◽  
Paulin Coulibaly
Keyword(s):  
Precipitation Extremes ◽  
Design Standards ◽  
Climate Change Projections ◽  
Design Storm ◽  
Increased Risk ◽  
Drainage Design ◽  
Current Design ◽  
Recurrence Intervals ◽  
Intensity Duration Frequency ◽  
Frequency Curves

Abstract. In Canada, increased risk of flooding due to heavy rainfall has risen in recent decades; most notable example include July 2013 storm in Greater Toronto region. We investigate nonstationarity and trends in the short-duration precipitation extremes in selected urbanized locations in Southern Ontario, Canada, and evaluate the potential of nonstationary Intensity-Duration-Frequency (IDF) curves, which form an input to civil infrastructural design. Despite apparent signals of nonstationarity in precipitation extremes in all locations, the stationary versus nonstationary models do not exhibit any significant differences in the design storm intensity. The signatures of nonstationarity in rainfall extremes do not necessarily imply the use of nonstationary IDFs for design considerations. When comparing the proposed IDFs with current design standards, for return periods (10-year or less) typical for urban drainage design, current design standards require an update up to 11 %, whereas for longer recurrence intervals (50–100-year), ideal for critical civil infrastructural design, updates ranging between ~ 2 to 30 % are suggested. We further emphasize that above findings need re-evaluation in light of climate change projections since intensity and frequency of extreme precipitation are expected to intensify due to global warming.

scholarly journals Does nonstationarity in rainfall require nonstationary intensity–duration–frequency curves?

2017 ◽  
Vol 21 (12) ◽  
pp. 6461-6483 ◽  
Author(s):  
Poulomi Ganguli ◽  
Paulin Coulibaly
Keyword(s):  
Precipitation Extremes ◽  
Urban Drainage ◽  
Design Standards ◽  
Climate Change Projections ◽  
Design Storm ◽  
Drainage Design ◽  
Current Design ◽  
Recurrence Intervals ◽  
Intensity Duration Frequency ◽  
Frequency Curves

Abstract. In Canada, risk of flooding due to heavy rainfall has risen in recent decades; the most notable recent examples include the July 2013 storm in the Greater Toronto region and the May 2017 flood of the Toronto Islands. We investigate nonstationarity and trends in the short-duration precipitation extremes in selected urbanized locations in Southern Ontario, Canada, and evaluate the potential of nonstationary intensity–duration–frequency (IDF) curves, which form an input to civil infrastructural design. Despite apparent signals of nonstationarity in precipitation extremes in all locations, the stationary vs. nonstationary models do not exhibit any significant differences in the design storm intensity, especially for short recurrence intervals (up to 10 years). The signatures of nonstationarity in rainfall extremes do not necessarily imply the use of nonstationary IDFs for design considerations. When comparing the proposed IDFs with current design standards, for return periods (10 years or less) typical for urban drainage design, current design standards require an update of up to 7 %, whereas for longer recurrence intervals (50–100 years), ideal for critical civil infrastructural design, updates ranging between  ∼ 2 and 44 % are suggested. We further emphasize that the above findings need re-evaluation in the light of climate change projections since the intensity and frequency of extreme precipitation are expected to intensify due to global warming.

Synthetic Design Storm and its Relation to Intensity-Duration Frequency Curves

1984 ◽  
Vol 16 (8-9) ◽  
pp. 69-83 ◽  
Author(s):  
P Urcikán ◽  
J Horváth
Keyword(s):  
Mathematical Models ◽  
Rainfall Runoff ◽  
Intensity Maximum ◽  
Evaluation Period ◽  
Design Storm ◽  
Maximum Time ◽  
Time Position ◽  
Exponential Equations ◽  
Intensity Duration Frequency ◽  
Frequency Curves

In the current hydrodynamic rainfall-runoff models the design rainfalls have been applied, the course of which may be simulated by means of several stochastic-mathematical models. The methods applied in developing the design storms with optional time position of the intensity maximum with increasing and decreasing intensity course, expressed by means of exponential equations have been analysed in this paper. The medium value of the intensity maximum time position tmax/td = 0,317 was identified in eight recording raingauge stations from the set of actual rainfalls of a five-year evaluation period.

scholarly journals Generation of Synthetic Design Storm Hyetograph and Hydrologic Modeling under HEC HMS for Ziz Watershed

2018 ◽  
Vol 8 (10) ◽  
pp. 3308-3319 ◽  
Keyword(s):  
Rainfall Intensity ◽  
Hydrological Model ◽  
Daily Rainfall ◽  
Distributed Hydrological Model ◽  
Flood Risks ◽  
Design Storm ◽  
Hourly Rainfall ◽  
Intensity Duration Frequency ◽  
Management Issues ◽  
Frequency Curves

This article proposes a methodology for generating hourly rainfall from daily rainfall data. It was evolved as a tool for managing flood risks on Ziz catchment, by means of Intensity-duration-frequency curves (IDF) and designed hyetograph of Chicago. The study area is located in the south-eastern part of Morocco, and did not have a monitoring station for hourly rain measure, the methodomogy consist of determinating the rainfall intensity for 24 h using IDF, then estimating the hourly rainfall using Chicago formula, in order to assess the accuracy of the method the resulting hyetographs was introduced into the semi-distributed hydrological model HEC HMS to simulate hourly flow, which was compared to the observed one. The obtaining results exhibit that the observed value is positively correlated with those obtained by the above method, as shown by the correlation coefficient and the Nash-Sutcliffe. This approach can deal with instantaneous water management issues by tackling flood risks and providing an appropriate range of data for the dam’s management.

scholarly journals Estimation of the G2P Design Storm from a Rainfall Convectivity Index

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1943
Author(s):  
Rosario Balbastre-Soldevila ◽  
Rafael García-Bartual ◽  
Ignacio Andrés-Doménech
Keyword(s):  
Shape Parameter ◽  
Rainfall Intensity ◽  
Analytical Relationship ◽  
Urban Drainage ◽  
Practical Application ◽  
Resolution Time ◽  
Simple Method ◽  
Design Storm ◽  
Intensity Duration Frequency ◽  
Two Parameter

The two-parameter gamma function (G2P) design storm is a recent methodology used to obtain synthetic hyetographs especially developed for urban hydrology applications. Further analytical developments on the G2P design storm are presented herein, linking the rainfall convectivity n-index with the shape parameter of the design storm. This step can provide a useful basis for future easy-to-handle rainfall inputs in the context of regional urban drainage studies. A practical application is presented herein for the case of Valencia (Spain), based on high-resolution time series of rainfall intensity. The resulting design storm captures certain internal statistics and features observed in the fine-scale rainfall intensity historical records. On the other hand, a direct, simple method is formulated to derivate the design storm from the intensity–duration–frequency (IDF) curves, making use of the analytical relationship with the n-index.

Development of Rainfall Intensity-Duration-Frequency Curves Based on Dynamically Downscaled Climate Data: Arizona Case Study

2021 ◽  
Vol 26 (5) ◽  
pp. 05021005
Author(s):  
Amin Mohebbi ◽  
Simin Akbariyeh ◽  
Montasir Maruf ◽  
Ziyan Wu ◽  
Juan Carlos Acuna ◽  
...  
Keyword(s):  
Rainfall Intensity ◽  
Climate Data ◽  
Intensity Duration Frequency ◽  
Frequency Curves
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