Latest / Timbuktu: Africa's Forgotten Center of Knowledge — Fexingo History / The Songhai Empire's Underground Water Systems
Transcript
- Lucas: So we've talked a lot about Timbuktu's scholars and its gold and salt trade, but there's a quieter piece of infrastructure that made all of it possible: water. The Songhai Empire built an extensive network of underground water channels called foggara, which is a term borrowed from North Africa. Luna: Foggara — like the qanat systems in Persia? Lucas: Exactly. Same concept: a gently sloping underground tunnel that taps into an aquifer and carries water by gravity to the surface. In the Sahara and Sahel, these were lifesavers. Timbuktu sits near the Niger River, but the river's seasonal floods made it unreliable. The foggaras provided a steady supply year-round. Lucas: The Tarikh al-Sudan, our main chronicle from the 17th century, mentions that many of these channels were built during the reign of Askia Dawud, who ruled Songhai from 1549 to 1582. He invested heavily in infrastructure — not just mosques and libraries, but also wells and irrigation. Luna: So they were digging tunnels in the desert? How deep? Lucas: Some went down tens of meters, then ran horizontally for kilometers. The engineering is remarkable: they had to maintain a precise gradient, usually between 0.1 and 0.5 percent, so the water would flow but not erode the tunnel. And they did it without modern surveying tools — just plumb lines and levels. Lucas: These weren't just for drinking water. The foggaras irrigated gardens and fields around the city. Timbuktu was famous for its dates, lemons, and even sugarcane at one point. All of that required a reliable water source beyond the Niger's floodplain. Luna: Who built them? Was it forced labor? Lucas: Partly. The Tarikh al-Fattash mentions that Askia Dawud used both paid workers and enslaved laborers. During wars, captives were often put to work on major construction projects. But there were also skilled free craftsmen who specialized in tunnel construction. They passed down knowledge of where to dig and how to shore up the walls. Lucas: The foggaras required constant maintenance. Silt and sand would accumulate, and the tunnels could collapse. The Songhai had teams of workers — often called 'foggaristi' in North Africa — who would enter the tunnels, sometimes crawling, to clear blockages. Luna: It sounds dangerous. Lucas: Very. Cave-ins were common. And there was the risk of hitting pockets of bad air. But these systems kept cities like Timbuktu, Gao, and Djenné alive. Without them, you couldn't sustain a large population or keep a manuscript library from rotting in the humidity. Lucas: The foggaras also had a social dimension. Water rights were carefully managed. The Tarikh al-Sudan records disputes over access — who could tap into a channel, how much they could draw, and who paid for repairs. The Qadis, or judges, often settled these cases. Luna: So water law was a big deal. Lucas: Absolutely. And it wasn't just foggaras. The Songhai also built reservoirs and cisterns to capture rainwater. In Gao, the capital, there were large public baths that required a steady supply. The hi-koi, the Songhai navy, patrolled the Niger and also helped with water transport for construction. Luna: The hi-koi — that's the fleet we talked about in episode 36. Lucas: Right. They moved stone and timber for building projects, including the foggaras. Some of the tunnels were lined with baked brick, which had to be brought from kilns along the river. That was a big logistical operation. Lucas: When the Moroccan invasion came in 1591, these systems were disrupted. The Saadian forces, under Judar Pasha, relied on different water sources and didn't maintain the foggaras. After the invasion, Timbuktu's population declined, and many channels fell into disrepair. Luna: Did they ever recover? Lucas: Partially. Some foggaras continued to be used into the 19th century. But the knowledge slowly faded. Today, archaeologists and hydrologists are studying the remnants to understand how they worked. There's renewed interest because of modern droughts — traditional knowledge could help with water management. Lucas: One interesting detail: the foggaras weren't just functional. They were also a symbol of civilization. The Tarikh al-Fattash says that when a ruler built a new foggara, it was celebrated with festivals. Water was seen as a gift from God, and engineering it was a sign of good governance. Luna: That's a nice contrast to how we often think of the Sahel — as this dry, barren place. Lucas: Exactly. The Songhai Empire was a sophisticated hydraulic society. They managed resources, settled disputes, and built lasting infrastructure. The foggaras are a reminder that Timbuktu wasn't just a city of books — it was a city of water. Luna: I want to see one of those tunnels. Lucas: Some are still accessible outside Timbuktu, though many have collapsed. There's ongoing work to document them before they're lost. If you're ever in Mali, it's worth a visit — but bring a flashlight.