Laksam Municipality in Bangladesh, a floodplain area, is vulnerable to the effects of climate change, including

seasonal floods due to excessive rainfall and rising water levels. A Sustainable Urban Stormwater Management

(SUSM) planning framework is crucial for climate change adaptation in municipalities, focusing on

environmental and social benefits alongside traditional drainage concerns, ensuring inclusive urban stormwater

management. The study aims to create a comprehensive, practical framework for sustainable stormwater

solutions in the municipality to mitigate climate change risks and improve urban resilience. The author used a

three-step process to write this paper: identifying the watershed characteristics and assessing the existing storm

drainage system, rainfall patterns analysis, and drainage priority setting based on multiple factors for the city’s

participatory planning can help raise awareness about SUSM’s benefits. The research concludes by emphasizing

the necessity of implementing a thorough approach to the SUSM framework in order to improve water quality,

Bangladesh ranks seventh on the 2021 World Climate Risk Index [1], highly vulnerable to climate change due

to its flat topography and flat terrain. Climate-induced natural disasters, such as tropical cyclones, floods,

droughts, and sea-level rise, exacerbate socioeconomic stress and hinder human well-being. Besides, a floodplain

region in Bangladesh, Laksam Municipality is vulnerable to the consequences of climate change, such as

seasonal floods brought on by high rainfall and rising water levels. Despite being a global pioneer in climate

desilting of sewers and the potential for efficient solid waste management to reduce the frequency and intensity

of urban floods remain central to Laksam's flood mitigation strategies. Yet, flood mitigation measures have not

been able to adequately control or manage the nation's urban floods, including those in the Laksam Municipality.

Therefore, Sustainable Urban Stormwater Management (SUSM) planning framework, which prioritizes social

and environmental advantages in addition to conventional drainage issues, is essential for municipalities adapting

Sustainable stormwater management in urban areas presents several challenges, necessitating innovative

approaches [3]. Traditional methods, such as retrofitting sites with green infrastructure, are less effective in areas

with impervious pavement. Traditional engineering solutions in stormwater collection systems are outdated due

to non-point source pollution, flooding, and poor waterway conditions. To achieve sustainable objectives,

municipal drainage system should use both structural and non-structural methods, balance supply and demand,

and create a sustainable urban drainage system while considering technical standards and reducing costs [5].

Therefore, the purpose of this study is to explore how sustainable urban stormwater management might be used

The effects of climate change are becoming increasingly noticeable on a global scale. Rising global average

temperatures, changed rainfall patterns, and a rise in the frequency of extreme weather events are just a few of

its effects. The United Nations Framework Convention on Climate Change (UNFCCC) defines climate change

as “a change of climate attributed directly or indirectly to human activity that modifies the composition of the

global atmosphere and which is in addition to natural climate variability observed over comparable periods” [6].

environment of cities have resulted from the continual growth of impermeable areas brought on by highdensity

construction, fast urbanization as well as climate change in recent years [7]. Urban stormwater management

(USM) faces significant issues as a result of these changes, which include decreased stormwater infiltration,

increased stormwater runoff, decreased groundwater recharge, and ongoing escalation of non-point source

pollution [8]. Along with all other urban services and amenities, a well-designed urban drainage system is one

of the most crucial elements of a respectable urban environment [5]. It is essential to citizens' daily lives as well

as the natural implications. Improper drainage of stormwater can result in waterlogging, inconvenience,

infrastructure damage, and health risks. In light of these difficulties, conventional technical approaches to USM

are becoming more widely acknowledged as inappropriate due to their lack of environmental sustainability. An

alternative adaptive strategy for reducing the long-term effects of urbanization and climate change, such as

context of these ideas varies, they usually seek to reduce the adverse effects of excessive urban stormwater and

try to restore natural hydrological processes through the use of wetlands, rain gardens, permeable pavements,

green roofs, and other techniques. According to scholarly and applied research, these SUSM strategies can have

positive social, economic, and environmental effects [11]. Additional benefits of SUSM include improved public

health, recreational value, ecological conservation, and the aesthetic appeal of constructed spaces [10]. To help

decision makers identify the main functions, operational performances, and extended advantages of various

aspects, a thorough evaluation framework for SUSM must be established. A trustworthy and appropriate

comprehensive evaluation procedure and methods can also expedite the assessment process and significantly cut

down on the time and expense involved in decision-making. Developed nations can provide valuable insights

and experience that can aid other regions in developing more scientific SUSM strategies [10]. Therefore, urban

local flooding caused by conventional drainage is a major concern for the Laksam Municipality. The

municipality’s transition to a resilient and sustainable environment has thus been made possible by the

indicate a drainage priority setting based on multiple factors for the city’s drainage network and flood-prone area

These can offer guidance on how to integrate stormwater runoff and artificial drains via secondary and main

drains, followed by natural streams, to construct the municipality’s drainage system economically. In order to

prevent roads, houses, and other properties from flooding during severe storms without contaminating the

waterbodies downstream in the Laksam Municipality, they will all continue to function as a single, integrated

system. As a result, preserving the municipal sustainable stormwater drainage infrastructure will provide friendly

reactions to a stronger climate response. It has the potential to offer multiple benefits, including sustainable urban

stormwater management (SUSM), and will improve urban floods and waterlogging risk management in a manner

surface and stormwater flow directions, municipal parameters, present drainage systems, and current and

prospective land use circumstances are summarized in the drainage characteristics that follow. The geographical

evaluation forecasts future drainage needs and evaluates the effectiveness of the current stormwater drainage

system using data. The investigation of rainfall patterns comes next. Using rainfall pattern analysis,

representative features have been initiated in order to create a sustainable urban drainage system that is both

dependable and reasonably priced for the management of stormwater in the Laksam Municipality. A model

stormwater discharge and a hydraulic assessment of the stormwater drainage system are formed using the

resulting design storms. Additionally, the HEC-HMS hydrologic computer model developed by the U.S. Army

Corps of Engineers has been used to calculate runoff from each sub-basin in this phase. This model calculates

the expected peak flows from each municipality sub-basin using the Input Parameters, Basin Delineation, and

the river and natural canals. Furthermore, urbanization modifies natural hydrologic and water quality response

of the watershed. Therefore, based on the vulnerability and risk assessment of the flood prone areas, the author

illustrates a flood-prone area management procedure as well to reduce the exposure to floods of the municipality.

The three-step planning framework used to illustrate the present study’s methodology is showed in Figure 1

Rising temperatures, intense rains, and tropical cyclones are predicted to significantly impact Laksam

Municipality's urban core, leading to increased rainfall, river floods, and extreme heat. Flash flooding is expected

during the monsoon season, affecting fisheries, water supplies, drainage, waterlogging, urban transportation

been known as a railway junction since the early nineteenth century. At now, however, its water body occupies

710.29 acres (Table 1), which represents 14.64% of its total land use [12]. The current municipal land utilization

Meghna and Gomati Rivers cause high water in the south section of the Dakatia River. Waterway flow is

decreased in the summer due to increased irrigation and a lack of precipitation. Only two rainfall episodes occur

per year; July and August see no discernible precipitation. The average monthly temperature is between 12°C to

36°C, and high weather frequently evaporate potential runoff. Table 3 displays the average rainfall and

The three features – the pond, ditch, and beel – help to partially prevent flooding in the area by retaining rainfall

during the monsoon. The Laksam Municipality is surrounded by watershed regions (Figure 3). Nonetheless,

The primary drainage basins are delineated by the boundary line established by the railway and the primary