The design flood under two approaches: synthetic storm hyetograph and observed storm hyetograph

Chimene, Catine António; Campos, José Nilson Beserra

doi:10.1080/23249676.2020.1787242

Cited by 13 publications

(7 citation statements)

References 27 publications

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“…The alternating Block Method is simple to create a hyetograph [25]. This method makes the rain that occurs in successive time intervals with a duration of t during the time Td = n∆t.…”

Section: ) Alternating Block Methodmentioning

confidence: 99%

Performance Evaluation of the Urban Drainage Network Structure Using the SWMM Model

Nurhamidah¹,

Junaidi²,

Yogyantoro³

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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The drainage channel system is an important factor in city planning. It controls runoff and prevents cities from flooding. The urban drainage design also contributed to the city planning in Padang, where the risk of flooding is very high. Belimbing Area is one of the neighborhoods in Padang that often floods because of the poor drainage channel system. This research aims to improve its drainage channel system by surveying parts of the Belimbing Area with a high risk of flooding and evaluating its drainage channels using EPA SWMM v5.1. Data such as drainage channel dimension, climate, and subbasin data are collected and simulated using the software. Rainfall data used for this research are 20 years from Koto Tuo Station and Gunung Nago Station. The distance between each station to the research area is 2.30 km for Koto Tuo Station and 3.30 km for Gunung Nago Station. The infiltration method used in the software is Horton's Method, which will provide the data by Infiltrometer. The result shows parts in Belimbing Area that cannot hold their runoff and which drainage channel overflows. Fortunately, there is no significant runoff or severe overflows, but the result does not match its existing situation. This might happen because of lots of trash and plants clogging the channel. This research will benefit the government and stakeholders to take action on the current situation by recovering Belimbing Area's drainage channel.

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“…The alternating Block Method is simple to create a hyetograph [25]. This method makes the rain that occurs in successive time intervals with a duration of t during the time Td = n∆t.…”

Section: ) Alternating Block Methodmentioning

confidence: 99%

Performance Evaluation of the Urban Drainage Network Structure Using the SWMM Model

Nurhamidah¹,

Junaidi²,

Yogyantoro³

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…The alternating block hyetograph (Chow et al, 1988) is one of the methods based on the IDF curves, as the Chicago hyetograph (Keifer and Chu, 1957). These methods produce the highest peak flows, resulting in critical flood situations and reliable design values, but are not intended to represent real event patterns (Grimaldi et al, 2012;Sordo-Ward et al, 2014;Na and Yoo, 2018;Chimene and Campos, 2020). The duration of the estimated storms equals the time of concentration of the Barcarena watershed.…”

Section: Hydrologic Modellingmentioning

confidence: 99%

Exploring spatial relationships between stream channel features, water depths and flow velocities during flash floods using HEC-GeoRAS and Geographic Information Systems

2022

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Water depths and flow velocities decisively influence the damage caused by flash floods. Geographic Information System (GIS) is a powerful and useful tool, allowing the spatial analysis of results obtained by hydraulic modelling, namely from the HEC-RAS/HEC-GeoRAS software. The GIS spatial analysis performed in this study seeks to explain and quantify the spatial relationships between the stream channel features and flow components during flash flood events. Despite these relationships are generically known, there are few studies exploring this subject in different geographic contexts. A 1D hydraulic model was applied in a small watershed in Portugal, providing good results in the definition of floodable areas, water depths and longitudinal velocities. No direct relationship was found between water depths and velocities in the floodable areas; however, negative strong correlations were found between the two flow components along the stream centerlines. Bed slope, channel and flood width, and roughness prove to be highly relevant on the longitudinal variations of water depths and velocities and on the location of maximum values. Increasing peak discharges and return periods (R T ) can change the relationships between water depths and velocities at the same location. Results can be improved with more accurate elevation data for stream channels and floodplains.

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“…Furthermore, they can be utilized to evaluate the impact of climate change on flood risk and enhance the precision of flood forecasting models. Synthetic hyetographs have been shown to provide more accurate estimates of flood risk and design flood hydrographs than traditional methods based on uniform rainfall distribution (Palynchuk & Guo 2011;Chimene & Campos 2020;Al-Wagdany 2021).…”

Section: Introductionmentioning

confidence: 99%

Deriving location-specific synthetic seasonal hyetographs using GPM records and comparing with SCS curves

Ram,

Gaur,

Patel

et al. 2024

Journal of Water and Climate Change

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The hyetograph represents the temporal spread of rainfall intensity occurring at a point or over a watershed during a storm. The importance of regionally derived/developed hyetographs and the pooled sets of categorical seasonal curves on intensity-duration, intensity-depth, and depth-duration are of multifarious conveniences and importance. Twenty-one years of daily and sub-daily rainfall records (2000–2020) regained via satellite-observed precipitation products were examined and used to retrieve a valid understanding towards annual, monthly, daily, and hourly based variability of rainfall across six different stations. An attempt was made to compare the shapes of synthesized seasonal rain mass curves with that of the historic Soil Conservation Service (SCS) mass curve. The results indicate that the location-specific patterns and trends of curves do not align closely with any historical SCS curves or theoretical curves prevalent in the literature and commonly adopted. It has been observed that region-specific rainfall and its temporal distributions exhibit unique trends, not necessarily conforming to the standard SCS-based curves categorized as Types I, Ia, II, and III. This emphasizes the need to rely more on region-specific curves rather than instinctively adopting a standard set of curves.

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The design flood under two approaches: synthetic storm hyetograph and observed storm hyetograph

Cited by 13 publications

References 27 publications

Performance Evaluation of the Urban Drainage Network Structure Using the SWMM Model

Performance Evaluation of the Urban Drainage Network Structure Using the SWMM Model

Exploring spatial relationships between stream channel features, water depths and flow velocities during flash floods using HEC-GeoRAS and Geographic Information Systems

Deriving location-specific synthetic seasonal hyetographs using GPM records and comparing with SCS curves

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