Storm Water Management in Accra, Ghana - Presentation
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An overview of the state of practice of storm water management in Accra, Ghana with recommendations for improved management practices that go beyond top-down, centralized and very expensive western technologies, better responding to the existing functional capacity and needs of the city.
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Storm Water Management in Accra, Ghana - Presentation
- 1. Storm water management in Accra, Ghana Heather Troutman Asiedu-Danquah Urban water cycle Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning Summer semester 2015 June 16, 2015 1
- 2. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 2 Table of content General overview Projects Overview of the study area Climate and precipitation Storm water drainage Flood situation Urban env’tal sanitation project -odaw drainage improvement -Korle lagoon ecological restoration project
- 3. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 3 Climate and precipitation data Mean annual rainfall in Ghana for the period 1981 - 2010 Source: Logah et. al. (2013)
- 4. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 4 Climate and precipitation data Source: http://people.eku.edu/davisb/Africa/Ch5notes.htm
- 5. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning Climate and precipitation data Source: 5
- 6. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 6 Climate and precipitation data - Return Periods One day rainfall occurrences June 27, 1960 98 mm June 22, 1973 175 mm July 14, 1991 157 mm June 9, 2002 123mm October 25, 2011 157mm Most Extreme one day rainfall occurrence July 4, 1995 – 244mm Source: https://www.modernghana.com/news/223779/1/are-the-municipal- solid-waste-management-practices.html Source: Adopted from Okyere, Yacouba & Gilgenbach (2012)
- 7. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning Storm water drainage Source: Adank et. al (2011) 7 Avg. precipitation 756 mm/year Accra area 1,261 km2 Avg. Storm water 9.5 million m3 /year
- 8. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 8 Linkages b/n hydrological, economical and political context of flood in Accra Source: Adopted from Okyere, Yacouba & Gilgenbach (2012) Natural factors human factors floods impacts
- 9. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 9 Urbanisation & sanitation Source: Adank et. al (2011)
- 10. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 10 flood situation June 03, 2015 http://www.ghanaweb.com/GhanaHomePage/NewsArchive/artikel.php ?ID=362491&gallery=0&VOLGNR=1 Overview of event 12 hoursof rainfall 263 mm About 35 settlementsaffected 150 peoplekilled About 9,200 peopleaffected http://graphic.com.gh/news/general-news/44408-annual-floods-in-accra-an- engineering-failure.html Response Clear debrisfrom recent floods, aswell on de-silting of choked drains Clearing all structuresin waterways Source:UNCTGhana,2015
- 11. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 11 flood situation June 03, 2015 Actors NADMO UNITED NATIONS Inter-Agency Working Group for Emergencies(IAWGE) UNICEF WHO TheGhanaRed Cross Source: UNCT Ghana, 2015 Suggested Long term solutions 120 km of storm drainsalong themajor river basins To construct water retention reservoirs Addressing issuesof wastecollection and disposal
- 12. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning Common response 12 Source: http://citifmonline.com/wp- content/uploads/2015/06/dysilting-of-odaw-river-2.jpg Odaw river desilting Source: http://citifmonline.com/wp- content/uploads/2015/06/dysilting-of-odaw-river-6.jpg
- 13. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 13 Source: (world bank report) Projects Phase 1: 1996 – 2004 Dredging and lining of primary and secondary storm drains Phase 2: 2004 – 2007 Lagoon restoration Erosion control Construction of small bridges Urban Environmental Sanitation Project Legal Impetus GhanaEnvironmental Sanitation Policy GhanaPoverty Reduction Strategy United NationsMillennium Development Goals #6: combating HIV/AIDS, malariaand other diseases #7: ensuring environmnetal sustainability
- 14. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 14 Uesp - Odaw drainage improvement Objective: “To alleviate flooding, the profile of the channel had to be reconstructed into a rectangular/trapezoidal shape, so it could carry a 1:25 years flood”. Source: (Bam International, 2014) Under thebudget of Ghana’sUrban Environmental Sanitation Project TheOdaw Drain isthemain outflow channel for Accra’sstorm water drainage network in Accra. Scope of work Construction of aconcrete-lined channel. Length: 3.4 kilometres Width: 23 metres Depth: 5 metres
- 15. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 15 Source: (Bam International, 2014) Urban Environmental Sanitation Project Uesp - Odaw drainage improvement
- 16. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 16 Impacts on Lagoons Source: (PMI, n.d) Pollution About 90, 000 peopleliving around the catchment of thelagoon Total surfaceareaisabout 0.6 km2 and drainsatotal catchment areaof about 400km2 TheOdaw river enterstheKorlelagoon and hasalargeconcentration of industrial wastes Korle lagoon ecological restoration project
- 17. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 17 UESP Round 2(KLERP) Source: (PMI, n.d) Objective: to improve Accra’s drainage, flooding and sanitation problems Ensuring good flood water conveyanceto thesea Implement thesewer pump station and offshoreoutfall pipeline. 4 phased project
- 18. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 18 Source: (PMI, n.d) Phase 1 Dredging of thelagoon Creation of storm water canals Removal of swampsto reduceflooding Creation of green areas Construction of an inceptor Construction of a pump station Outfall installation works Infrastructure works Sediment removal and re- dredging of thelagoons Sediment removal in thecanals& drains Fencing & beautification works Design, supervise and construct bulk servicesincluding roads, water, sewer, storm water, drainage To executethe required Environmental Impact Assessment. Phase 2 Phase 3 Phase 4 UESP Round 2(KLERP)
- 19. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 19 Recommendations and conclusions Waste management solutions Urban development solutions – creating sustainable housing Covered drainage with pv cells Construction of retention reserviors
- 20. Heather Troutman Asiedu-Danquah Urban water cycles Prof. dr.-ing. wolfgang dickhaut Resource efficiency in architecture and planning 20 Thank you!!
Notes de l'éditeur
- Increasing in impervious areas (high runoff coefficient areas), due to built ‐ up, which leads to a higher susceptibility to floods.
- Increasing in impervious areas (high runoff coefficient areas), due to built ‐ up, which leads to a higher susceptibility to floods
- The system is based purely on gravity, with mainly open drains and some covered sections in the central business district.
- The system is based purely on gravity, with mainly open drains and some covered sections in the central business district.
- The Odaw river entering the Korle lagoon is and has a large concentration of industrial wastes including Ghana breweries limited, several textile factories and vehicle repair shops
- To improve Accra’s drainage, flooding and sanitation problems by ensuring good flood water conveyance to the sea as well as the implementation of the sewer pump station and offshore outfall pipeline.
- To improve Accra’s drainage, flooding and sanitation problems by ensuring good flood water conveyance to the sea as well as the implementation of the sewer pump station and offshore outfall pipeline.