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Modelling the effect of sediment and solid waste deposition on urban flooding in Kampala, Uganda

Olsson, Hjalmar LU (2024) In TVVR 5000 VVRM05 20241
Division of Water Resources Engineering
Abstract
Pluvial flooding is a significant and growing issue in Kampala, Uganda, driven by increased urbanization, lack of sufficient maintenance of the urban drainage system and climate change. This study investigates the impact of sediment and solid waste deposition on urban flooding within the upstream part of the Lubigi catchment area. Using PCSWMM, a 1D hydraulic model was developed to simulate various scenarios of sediment and solid waste deposition in combination with extreme rainfall events. Field observations, including high-resolution rain data and water level measurements, were implemented, and used for model calibration and validation. The study reveals three critical points vulnerable to flooding in the upstream Lubigi catchment area... (More)
Pluvial flooding is a significant and growing issue in Kampala, Uganda, driven by increased urbanization, lack of sufficient maintenance of the urban drainage system and climate change. This study investigates the impact of sediment and solid waste deposition on urban flooding within the upstream part of the Lubigi catchment area. Using PCSWMM, a 1D hydraulic model was developed to simulate various scenarios of sediment and solid waste deposition in combination with extreme rainfall events. Field observations, including high-resolution rain data and water level measurements, were implemented, and used for model calibration and validation. The study reveals three critical points vulnerable to flooding in the upstream Lubigi catchment area considering current sediment and solid waste deposition. Furthermore, the results show that increasing sediment and solid waste deposition significantly increases the flooded volume, not only for high return periods but also for lower return periods. In addition, field observations of rainfall suggest that existing synthetic design storms for Kampala may inaccurately estimate the timing of the rainfall peaks. The findings highlight that frequently clearing sediment and solid waste is crucial to mitigating flooding in the upstream Lubigi catchment area. (Less)
Please use this url to cite or link to this publication:
author
Olsson, Hjalmar LU
supervisor
organization
course
VVRM05 20241
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Sediment deposition, Solid waste deposition, Pluvial flooding, Kampala, Flood risk management, PCSWMM, Hydraulic modelling, Climate change, Urban drainage systems (UDSs)
publication/series
TVVR 5000
report number
TVVR24/5004
ISSN
1101-9824
language
English
additional info
Examiner: Magnus Larson
id
9169315
date added to LUP
2024-06-28 18:43:22
date last changed
2024-06-28 18:43:22
@misc{9169315,
  abstract     = {{Pluvial flooding is a significant and growing issue in Kampala, Uganda, driven by increased urbanization, lack of sufficient maintenance of the urban drainage system and climate change. This study investigates the impact of sediment and solid waste deposition on urban flooding within the upstream part of the Lubigi catchment area. Using PCSWMM, a 1D hydraulic model was developed to simulate various scenarios of sediment and solid waste deposition in combination with extreme rainfall events. Field observations, including high-resolution rain data and water level measurements, were implemented, and used for model calibration and validation. The study reveals three critical points vulnerable to flooding in the upstream Lubigi catchment area considering current sediment and solid waste deposition. Furthermore, the results show that increasing sediment and solid waste deposition significantly increases the flooded volume, not only for high return periods but also for lower return periods. In addition, field observations of rainfall suggest that existing synthetic design storms for Kampala may inaccurately estimate the timing of the rainfall peaks. The findings highlight that frequently clearing sediment and solid waste is crucial to mitigating flooding in the upstream Lubigi catchment area.}},
  author       = {{Olsson, Hjalmar}},
  issn         = {{1101-9824}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{TVVR 5000}},
  title        = {{Modelling the effect of sediment and solid waste deposition on urban flooding in Kampala, Uganda}},
  year         = {{2024}},
}