Frequency Analysis of Flash Floods for Establishing New Danger Levels for the Rivers in the Northeast
            <i>Haor</i>
            Region of Bangladesh

Roy, Binata; Islam, A. K. M. Saiful; Islam, G. M. Tarekul; Khan, Md. Jamal Uddin; Bhattacharya, Biswa; Ali, Md. Hazrat; Khan, Abu Saleh; Hossain, Md. Saiful; Sarker, Gopal Chandra; Pieu, Nahruma Mehzabeen

doi:10.1061/(asce)he.1943-5584.0001760

Cited by 14 publications

(9 citation statements)

References 40 publications

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“…Though flood mainly affects flood plains, it causes fatalities and damage crops, homesteads, livestock, plants, and infrastructure through inundation (Whitehead et al, 2015). However, It also creates extensive riverbank erosion (Roy et al, 2019).…”

Section: Flood In the Context Of Bangladeshmentioning

confidence: 99%

“…Thus, several advanced warning models are widely used in developed countries for flood forecasting. This warning is circulated to the media for broadcast and government and non-government organizations (Khan et al, 2018;Roy et al, 2019;Sai et al, 2018). Most of the research in this category suggested models that can be used for flood forecasting and in the case of a long-term warning, the studies predicted that the severity and frequency of floods in Bangladesh would increase in the coming 10 to 30 years.…”

Section: Referencesmentioning

confidence: 99%

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Flood Research in Bangladesh and Future Direction: An Insight From Last Three Decades

Hossen,

Nawaz,

Kabir

2022

International Journal of Disaster Risk Management

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Flooding is a critical concern that causes substantial economic damages and social issues for different regions of Bangladesh every year. Approximately one-third of the country's total area is highly vulnerable to floods, and people's sufferings from the flooding are beyond description. Despite the magnitude and extent of floods, coma prehensive study on flood research in Bangladesh is inadequate. Therefore, this study analyses research articles published on floods, and their implications in Bangladesh over the last three decades. We used a systematic literature review to precisely understand the trend and pattern of published flood research in Bangladesh by summarizing, categorizing, and visualizing the existing research articles. This review revealed that research on integrated flood adaptation and management, effective flood modeling, and reliable forecasting is considerably less emphasized than studying the causes and impacts of the flood. In order to detect changes in flood causes and impacts over time and establish links between physical exposure, risk experience, and socio-demographic data in research to develop integrated flood management mechanisms, it is possible to operationalize systematic study in a specific location for an extended period. We also found that a considerable increase in interest in doing flood research following the year 2000, as the country experienced an increase in the frequency and severity of floods across the country. Based on findings of this study, we suggested an agenda of future flood research in Bangladesh.

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Section: Flood In the Context Of Bangladeshmentioning

confidence: 99%

Section: Referencesmentioning

confidence: 99%

Flood Research in Bangladesh and Future Direction: An Insight From Last Three Decades

Hossen,

Nawaz,

Kabir

2022

International Journal of Disaster Risk Management

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“…In Bangladesh, pre‐monsoon flash floods occur almost every year in some parts of the northeast Haor basin between March and May while riverine flooding occurs between June and September. The latter is also known as the monsoon flood (Roy et al ., 2019). During the pre‐monsoon season (March–May), the north‐eastern part of Bangladesh often experiences flash floods, a major natural hazard in that region and one that vastly affects lives, property, and croplands.…”

Section: Introductionmentioning

confidence: 99%

“…During the pre‐monsoon season (March–May), the north‐eastern part of Bangladesh often experiences flash floods, a major natural hazard in that region and one that vastly affects lives, property, and croplands. Flash floods damage thousands of hectares (ha) of boro rice crops, considered a staple crop in the country (Ahmed et al ., 2017; Roy et al ., 2019; Hossain et al ., 2017; Humanitarian Response, 2017). Agricultural wages also sometimes decline during the flooding months in inundated districts (Banerjee, 2007).…”

Section: Introductionmentioning

confidence: 99%

A geospatial assessment of flood hazard in north‐eastern depressed basin, Bangladesh

Quader

Dey

Malak

et al. 2023

Singap J Trop Geogr

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Floods are a frequently occurring calamity in deltaic Bangladesh. This paper aims to assess the temporal expansion of waterbodies during flooding using geospatial techniques. Several water indices were applied to classify the satellite images at various temporal scales. Among them, the Normalized Difference Water Index (NDWI) showed the highest correlation (r = 0.831; where p = 0.01) with rainfall data. Specifically, the NDWI results showed that perennial waterbodies measured 37 km 2 and 60 km 2 in Sunamganj District in 2017 and 2019, respectively. The area of waterbodies notably increased 52-fold from March to April (37 km 2 to 1958 km 2 ) during the premonsoon flash flood of 2017. During the July 2019 monsoon flood, waterbodies started to extend after May and flooded 2784 km 2 in area. NDVI analysis showed that in 2019, floodwater submerged 361.7 km 2 of vegetation cover. At the same time, the Surma River's flooding resulted in a 73.9 per cent inundation of the total area of the Sunamganj District. We hope that this study will provide better understanding of the varying nature of floods that occur in the low lying bowl shaped Haor region which will in turn assist the government with flood mitigation.

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“…Flash floods in the region can rapidly inundate low‐lying areas and usually occur within minutes to hours after excessive rainfall, with their duration being less than 6 hours (Sumon & Islam, 2013). Due to the geographic location of the wetlands, these recurring floods are a common occurrence for haor residents adjacent to the hills, and play a devastating and widespread role in the region (Ferdushi et al., 2019; Haque et al., 2021; Kamal et al., 2018; Roy et al., 2019). On average, severe flash floods occur once every 3 years in the haor region (Chakraborty et al., 2021), and it is important to address the question of why recent flash floods have played a persistently destructive role in the haor basin.…”

Section: Introductionmentioning

confidence: 99%

How Do Vulnerable People in Bangladesh Experience Environmental Stress From Sedimentation in the Haor Wetlands? An Exploratory Study

Islam

Haq

Ahmed

et al. 2022

Water Resources Research

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Introduction and BackgroundThe haor landscape (Figure 1) comprises a large, shallow tectonic depression in the northeastern part of Bangladesh that becomes inundated to a depth of 5 m or more during the monsoonal annual rainy season. Haor covers an area of approximately 2 million hectares (19,998 km 2 ) and supports a population of 19.37 million people (Chakraborty et al., 2021;Kamal et al., 2018). The haor basin is actively subsiding, and its hydrological, topographical, geomorphological, and socioeconomic features are distinctive as compared to other parts of Bangladesh (Chakraborty, Mondal, et al., 2012;IUCN, 2015). The geology of the haor basin consists of 13-20 km thick alluvial and deltaic deposits underlain by gneisses and granites, and the basin is bounded by the Shillong Plateau to the north (Figure 1), the Indo-Burman Range to the east, and the Indian Shield to the west. Non-calcareous, non-saline gray alluvium and acidic, alkaline clays are the most common soils within the basin (DBHWD, 2017), which is predominantly topographically flat but possesses some low hills that are covered with rainforest, tea and rubber plantations. The haor is very close to the towns of Cherrapunji (Figure 1) and Mawsynram, which are considered to be the rainiest places in the world, with an average annual rainfall of 11,755 mm and an average rainfall of 1,700 and 7,400 mm in the pre-and post-monsoon seasons, respectively (Basher et al., 2018;Rahman et al., 2020). As a result, the haor region receives significant runoff from 23 small transboundary rivers, including the Surma-Baulai, Kalni-Kushiyara, and Kangsa-Dhanu rivers, which originate in the hill regions of neighboring India. Seventy percent of the total catchment area of these rivers depends on three Indian States: Meghalaya, Assam, and Tripura (CEGIS, 2012). This abundant runoff enables the annual flooding of the haor region (Figure 2) to depths of 5-7 m, and much of the area is thus characterized by regular yearly inundation.

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Frequency Analysis of Flash Floods for Establishing New Danger Levels for the Rivers in the Northeast Haor Region of Bangladesh

Cited by 14 publications

References 40 publications

Flood Research in Bangladesh and Future Direction: An Insight From Last Three Decades

Flood Research in Bangladesh and Future Direction: An Insight From Last Three Decades

A geospatial assessment of flood hazard in north‐eastern depressed basin, Bangladesh

How Do Vulnerable People in Bangladesh Experience Environmental Stress From Sedimentation in the Haor Wetlands? An Exploratory Study

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