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Reconstruction after 2011 Flooding – Sindh A DFID-Funded project through IOM with Heritage Foundation
Purpose of presentation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Local people learning to make a ring beam of bamboo and lime-concrete. The Ring Beam
Without a ring beam the heavy girders  “point load” onto specific points on the wall causing it to crack, buckle then collapse
This conventional / brick and mortar wall is vulnerable because there is NO ring beam beneath the heavy steel girders!
A typical house in lower Sindh. The top of the wall is not protected by the roof – making it vulnerable to monsoon rain getting in, weakening and eventually causing the walls to collapse. By extending the eaves further out this would be resolved
This house has already been rebuilt – without technical advice so the building is once again vulnerable to collapse in heavy rains.  For this reason, technical training is one of the best ways to build resilience to future floods / heavy rains.  Training should take place in as many communities as possible, using  “hands-on” learning, re-building at least one house properly – as reference for the rest of the community.  Rain will flash in here and weaken the wall Point loading by this beam will cause collapse of the weakened wall
A typical roof in lower Sindh: weak and bearing directly onto the walls  (& no ring beam to distribute the weight).
An extended eave, built by local people during Heritage Foundation training. This will prevent rain flooding into the top of the wall.   The  ring beam  runs below these  bamboo girders , now out of site, covered in earth plaster
Bamboo rafters placed at around 50cm centres on top of the bamboo girders.  This roof offers greater structural integrity than the popular model of two steel girders and widely spaced bamboo rafters.   It is also much cheaper.  Girder Rafter
[object Object],[object Object],[object Object],[object Object]
These roofs are far stronger than typical roofs made from steel girders and bamboo poles (partially because of the shorter distances between each girder & rafter). So they can be used as  “refuge platforms” in case of future flooding (or to grow food, store stuff, etc.).  This is a good example of innovation, building resilience and value for money!
Local kids with architecture students from Karachi who should be proud of their voluntary work within these communities. And Carmen, from UN-OCHA whose coordination facilitated this programme
[object Object],[object Object],[object Object],[object Object],[object Object],Karachi University Architecture student explains the methods and rationale of lime use
Critical DRR measures: house on raised platform, lime-strengthened external plaster, roof protruding over walls with longer eaves than usual
[object Object],[object Object],[object Object],[object Object]
Technical training delivered by Heritage staff and volunteers (student of architecture from Karachi)
Proud of their new homes, some people are decorating them – showing their pride and ownership
 
Experimenting with low-cost bamboo construction for a temporary school based on similar building systems
Yasmeen Lari, co-founder of Heritage Foundation – who have been working with bamboo and lime for 5 years in Kashmir, Swat valley and Sindh
Potential partnership with landowners and businesses ,[object Object],[object Object],[object Object],[object Object]
The critical elements to affordable, flood resistant and sturdy homes: bamboo and lime (also have far lower environmental impact than brick, other timber and cement)
Cost  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Annex on house damage ,[object Object]
These houses have been in the water for over 3 months – and are still standing. This is testament to the capacity of well-built earthen walls to withstand flooding. As the pitched roofs have sufficient eaves, the top of the walls were also protected, preventing collapse.
Same community, different angle
In the same community this roof has collapsed. Probably due to poor wall construction and lack of ring beam; water may well have infiltrated through thatch roof into top of wall.
Typical construction technique in many parts of Sindh: walls are built around wooden posts, plastered with earth. These posts should be raised off the ground or placed in a lime-concrete bed to protect them from fungus and rotting.
A reed house from the same community already under reconstruction. This will be covered with mud plaster on both sides of the walls, upon which the roof will be placed. Strategic technical advice provided now could greatly increase the resilience of this building.
This shows how heavy roof beams without a ring beam have caused the walls to buckle and crack. They are also trunks from mature trees – which led to further deforestation in the area, something that should be avoided.

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Tando alla yar nov 2011 draft

  • 1. Reconstruction after 2011 Flooding – Sindh A DFID-Funded project through IOM with Heritage Foundation
  • 2.
  • 3. Local people learning to make a ring beam of bamboo and lime-concrete. The Ring Beam
  • 4. Without a ring beam the heavy girders “point load” onto specific points on the wall causing it to crack, buckle then collapse
  • 5. This conventional / brick and mortar wall is vulnerable because there is NO ring beam beneath the heavy steel girders!
  • 6. A typical house in lower Sindh. The top of the wall is not protected by the roof – making it vulnerable to monsoon rain getting in, weakening and eventually causing the walls to collapse. By extending the eaves further out this would be resolved
  • 7. This house has already been rebuilt – without technical advice so the building is once again vulnerable to collapse in heavy rains. For this reason, technical training is one of the best ways to build resilience to future floods / heavy rains. Training should take place in as many communities as possible, using “hands-on” learning, re-building at least one house properly – as reference for the rest of the community. Rain will flash in here and weaken the wall Point loading by this beam will cause collapse of the weakened wall
  • 8. A typical roof in lower Sindh: weak and bearing directly onto the walls (& no ring beam to distribute the weight).
  • 9. An extended eave, built by local people during Heritage Foundation training. This will prevent rain flooding into the top of the wall. The ring beam runs below these bamboo girders , now out of site, covered in earth plaster
  • 10. Bamboo rafters placed at around 50cm centres on top of the bamboo girders. This roof offers greater structural integrity than the popular model of two steel girders and widely spaced bamboo rafters. It is also much cheaper. Girder Rafter
  • 11.
  • 12. These roofs are far stronger than typical roofs made from steel girders and bamboo poles (partially because of the shorter distances between each girder & rafter). So they can be used as “refuge platforms” in case of future flooding (or to grow food, store stuff, etc.). This is a good example of innovation, building resilience and value for money!
  • 13. Local kids with architecture students from Karachi who should be proud of their voluntary work within these communities. And Carmen, from UN-OCHA whose coordination facilitated this programme
  • 14.
  • 15. Critical DRR measures: house on raised platform, lime-strengthened external plaster, roof protruding over walls with longer eaves than usual
  • 16.
  • 17. Technical training delivered by Heritage staff and volunteers (student of architecture from Karachi)
  • 18. Proud of their new homes, some people are decorating them – showing their pride and ownership
  • 19.  
  • 20. Experimenting with low-cost bamboo construction for a temporary school based on similar building systems
  • 21. Yasmeen Lari, co-founder of Heritage Foundation – who have been working with bamboo and lime for 5 years in Kashmir, Swat valley and Sindh
  • 22.
  • 23. The critical elements to affordable, flood resistant and sturdy homes: bamboo and lime (also have far lower environmental impact than brick, other timber and cement)
  • 24.
  • 25.
  • 26. These houses have been in the water for over 3 months – and are still standing. This is testament to the capacity of well-built earthen walls to withstand flooding. As the pitched roofs have sufficient eaves, the top of the walls were also protected, preventing collapse.
  • 28. In the same community this roof has collapsed. Probably due to poor wall construction and lack of ring beam; water may well have infiltrated through thatch roof into top of wall.
  • 29. Typical construction technique in many parts of Sindh: walls are built around wooden posts, plastered with earth. These posts should be raised off the ground or placed in a lime-concrete bed to protect them from fungus and rotting.
  • 30. A reed house from the same community already under reconstruction. This will be covered with mud plaster on both sides of the walls, upon which the roof will be placed. Strategic technical advice provided now could greatly increase the resilience of this building.
  • 31. This shows how heavy roof beams without a ring beam have caused the walls to buckle and crack. They are also trunks from mature trees – which led to further deforestation in the area, something that should be avoided.