Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia
Study region: Addis Ababa, Ethiopia. Study focus: Addis Ababa is undergoing rapid urbanization with unprecedented high rate of road and building constructions, resulting in a sudden upsurge of sealed surfaces and generation of significant amounts of stormwater. The present study therefore aims to in...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-10-01
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| Series: | Journal of Hydrology: Regional Studies |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581819301843 |
| _version_ | 1811334528222887936 |
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| author | Dagnachew Adugna Brook Lemma Marina Bergen Jensen Geremew Sahilu Gebrie |
| author_facet | Dagnachew Adugna Brook Lemma Marina Bergen Jensen Geremew Sahilu Gebrie |
| author_sort | Dagnachew Adugna |
| collection | DOAJ |
| description | Study region: Addis Ababa, Ethiopia. Study focus: Addis Ababa is undergoing rapid urbanization with unprecedented high rate of road and building constructions, resulting in a sudden upsurge of sealed surfaces and generation of significant amounts of stormwater. The present study therefore aims to investigate the hydraulic capacity of existing drains and stormwater management challenges using detailed field surveys, and stakeholders' interview. 469 road segments (74 km) and 202 drain segments (42.76 km) in two representative case sites confined in 564.54 ha boundary areas were physically surveyed. New hydrological insights for the region: Results showed that 14% of the drains in new city parts and 28% in old city parts were in conditions inadequate for removal of stormwater, resulting in flash flooding and infrastructure degradation in the associated watersheds. Further, although more than 72% of the surveyed drains were oversized, stormwater overtopping reoccur as a season-to-season problem, ascribed to illegal dumping of waste into drains, reducing their hydraulic capacity. The challenges of stormwater management were related to lack of city-wide drainage master plan, absence of hydrologic data considerations during designing drains, and weak enforcement on solid and liquid waste dumping into drains. The present study recommends that building practices that minimize surface sealing and critical hydrologic and hydraulic considerations during designing drains, and educating the local community and stakeholders regarding waste management. Keywords: Addis Ababa, Ethiopia, Flash flooding, Hydraulic capacity of drains, Integrated land-use planning, Stormwater runoff |
| first_indexed | 2024-04-13T17:09:21Z |
| format | Article |
| id | doaj.art-caeb811f3faa4e5588d2f77d883b2958 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-04-13T17:09:21Z |
| publishDate | 2019-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-caeb811f3faa4e5588d2f77d883b29582022-12-22T02:38:20ZengElsevierJournal of Hydrology: Regional Studies2214-58182019-10-0125Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, EthiopiaDagnachew Adugna0Brook Lemma1Marina Bergen Jensen2Geremew Sahilu Gebrie3Ethiopian institute of Architecture, Building Construction and City Development, Addis Ababa University, Ethiopia; Department of Geosciences and Natural Resource Management, Copenhagen University, Denmark; Corresponding author at: Ethiopian institute of Architecture, Building Construction and City Development, Addis Ababa University, Ethiopia.College of Natural & Computational Sciences, Addis Ababa University, EthiopiaDepartment of Geosciences and Natural Resource Management, Copenhagen University, DenmarkAddis Ababa institute of Technology, Addis Ababa University, EthiopiaStudy region: Addis Ababa, Ethiopia. Study focus: Addis Ababa is undergoing rapid urbanization with unprecedented high rate of road and building constructions, resulting in a sudden upsurge of sealed surfaces and generation of significant amounts of stormwater. The present study therefore aims to investigate the hydraulic capacity of existing drains and stormwater management challenges using detailed field surveys, and stakeholders' interview. 469 road segments (74 km) and 202 drain segments (42.76 km) in two representative case sites confined in 564.54 ha boundary areas were physically surveyed. New hydrological insights for the region: Results showed that 14% of the drains in new city parts and 28% in old city parts were in conditions inadequate for removal of stormwater, resulting in flash flooding and infrastructure degradation in the associated watersheds. Further, although more than 72% of the surveyed drains were oversized, stormwater overtopping reoccur as a season-to-season problem, ascribed to illegal dumping of waste into drains, reducing their hydraulic capacity. The challenges of stormwater management were related to lack of city-wide drainage master plan, absence of hydrologic data considerations during designing drains, and weak enforcement on solid and liquid waste dumping into drains. The present study recommends that building practices that minimize surface sealing and critical hydrologic and hydraulic considerations during designing drains, and educating the local community and stakeholders regarding waste management. Keywords: Addis Ababa, Ethiopia, Flash flooding, Hydraulic capacity of drains, Integrated land-use planning, Stormwater runoffhttp://www.sciencedirect.com/science/article/pii/S2214581819301843 |
| spellingShingle | Dagnachew Adugna Brook Lemma Marina Bergen Jensen Geremew Sahilu Gebrie Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia Journal of Hydrology: Regional Studies |
| title | Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia |
| title_full | Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia |
| title_fullStr | Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia |
| title_full_unstemmed | Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia |
| title_short | Evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in Addis Ababa, Ethiopia |
| title_sort | evaluating the hydraulic capacity of existing drain systems and the management challenges of stormwater in addis ababa ethiopia |
| url | http://www.sciencedirect.com/science/article/pii/S2214581819301843 |
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