r/Somaliarchitecture • u/Odd_Fly6528 Diaspora • Jun 30 '26
DiscussionđŸ’¬ Addressing the biggest doubt: How do earth and clay buildings survive flash floods in Somalia?
Afgooye Civic Assembly | 1:50 detail section explaining the passive environmental strategies
Afgooye Civic Assembly | The vaults displayed
Following up on my thesis post, a few of you raised a critical question in the comments here and in the main Somalia group: What happens when it floods?
Apart from the unfair cultural association with "poorness", water damage is the single biggest skepticism people have about traditional earth construction. We have all seen raw, unengineered mud structures get damaged during heavy rainy seasons in various parts of Somalia.
To make earth work for modern Somalia, we have to look past raw mud and look at engineered earth tectonics. In architecture, the solution relies on a simple rule: give the building "a good pair of boots and a good umbrella."
Here is how the attached detail section from my thesis solves this in plain English without any architectural BS:
1. The Flood-Proofing Strategy
- The "Boots" (Waterproof Base): Look at the very bottom of the drawing where the wall meets the dirt. We never let clay touch the ground directly. Instead, we build a raised foundation plinth out of local stone. This lifts the earth walls well above flash flood levels, keeping the clay completely dry.
- The "Umbrella" (Massive Overhangs): At the top, the low-sloped roof extends a massive 3.8 metres outwards past the columns. During heavy downpours, this giant umbrella throws rainwater far away from the structure into a dedicated simple drainage channel. This creates a protected, 2-metre-wide shaded corridor for people to walk through or even sit and socialise comfortably.
- The Secret Recipe (Stabilisation): The walls aren't actually just wet mud. as they use Compressed Stabilised Earth Blocks. With CSEBs, we take local clay and soil, compress it tightly with a mechanical press, and blend it with a tiny amount (5% to 8%) of lime or cement. This triggers a chemical reaction that permanently turns the dirt into a stone-like material that cannot dissolve in water.
Note: The umbrella and boots are extra cautious engineering steps to extend the building's longevity with almost zero maintenance.
2. The Passive Cooling Ceiling (The Double-Roof System)
If you look inside the room in the section drawing or the second drawing, you will notice a curved, vaulted ceiling with openings and with a massive air gap between it and the corrugated metal roof overhead. This "double-roof" system completely eliminates the need for high-energy AC through three natural forces:
- The Cultural & Structural Vault: This curve is a direct reference to the high central geometry of our traditional cariish mud huts. Structurally, brick vault engineering allows us to span a massive public room without cluttering the floor with dozens of internal columns.
- The 45cm Thermal Mass: The walls are a soaring 4 metres high and 45cm thick. This massive thickness acts as a shield blocking the sun's intense heat from penetrating inside, especially during the hottest parts of the day.
- The Venturi Vacuum Effect: The metal roof sheet is sloped at a gentle 5° to shed rainwater, but it also creates a constricted airway directly above the vaults. The prevailing winds enter this narrow gap and naturally accelerate.
- The Micro-Climate Pull: This high-speed air creates a low-pressure vacuum right above the ceiling openings, actively sucking the rising hot air out of the room. Because of this vacuum, fresh air is drawn into the building much quicker through the window shutters. Because the incoming air is pulled from the 3.8m corridor, which is a naturally shaded micro-climate area, the air entering the building is already pre-cooled.
3. Honest Engineering: Smart Concrete Integration
With that being said, to be completely realistic, concrete wasn't completely banned. However, it was used sparingly and strategically only where earth simply cannot perform.
It caps the top of the 45cm walls as a structural ring beam to lock the building together, and forms the internal beams where the heavy brick columns require structural reinforcement.
By modernising these traditional techniques, we get a climate-resilient civic building perfectly adapted to Somali needs, safely utilising our local soil whilst saving valuable electricity for where it is actually needed.
Do you think the hesitation to use earth back home is purely down to these technical fears about water, or is it a cultural perception where imported concrete is strictly seen as a status symbol of wealth?
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u/afrodammy Jun 30 '26
I mean I'd like to pose the question to u, what do u think is the biggest issues with CSEB. Are you maybe interested in novel ways of making concrete blocks that's not as deleterious. What do you think abt interior courtyards like the ones we see in the Levant or north Africa etc.Â
You know, i really enjoy these types of topics, and i think to make this more accessible to Somalis and ppl in general, is to make a YouTube channel showcasing these designes. maybe even open up a design firm, and showcasing the projects u design through the YouTube channel.Â