700,000 People, 17% of a City: What a New Flood Study Says About Addis Ababa's Drainage Problem

On July 22, 2026, an 11-year-old named Simon Nahom fell into an uncovered drainage channel in Jemo 3, a neighborhood in Nifas Silk-Lafto. "The water pressure was too strong even for adults to withstand," a neighbor, Yonas Tamiru, said afterward. More than three weeks later, Simon is still missing.

His disappearance is the human version of a problem a new study just measured precisely.

The numbers behind the risk

A flood-susceptibility study by researcher Desta Jula at the Ethiopian Artificial Intelligence Institute, released September 2025, mapped flood exposure across the entire city. The findings: 56% of Addis Ababa faces moderate flood risk, 29.4% is classified high-risk, and 1.3% is exposed to potentially deadly flooding from external water sources. Only 71.5 square kilometers of the city has low susceptibility.

The two most exposed districts are Nifas Silk-Lafto — where Simon disappeared — and Akaki Qality. Citywide, the study estimates nearly 700,000 people, about 17% of Addis Ababa's 4.1 million residents, and 14,777 households are exposed.

Why now, and not decades ago

The study attributes flood risk to four factors: 43% to altitude, 30% to inadequate drainage, 19% to distance from drainage systems, and under 8% to rainfall itself — a breakdown that puts most of the blame on how the city is built, not how much it rains.

That tracks with how fast the city has grown. Addis Ababa's built-up area expanded from 80.1 square kilometers in 1984 to 287.9 square kilometers in 2020 — a 259% increase in 35 years — while the number of weredas (districts) prone to heavy runoff climbed from 40 to 81. Civil engineering professor Abebe Dinku of Addis Ababa University put it bluntly: "The recurring floods can't be read as natural disasters alone... Defects in design, construction and preparedness are doing much of the damage."

What it's already costing

Flood damages totaled 61.3 million birr between 2018 and 2024. In 2017 alone, the city recorded 76 flooding events and 20 million birr in damage. Major flooding in August 2022 killed at least 9 people; a 2021 flood in Nifas Silk-Lafto killed at least 7.

The costs show up in smaller, stranger ways too. Addis Ababa's growing fleet of electric vehicles is proving unexpectedly vulnerable — a flood-damaged Changan Ben battery can cost 650,000 birr to repair, roughly half the vehicle's value, while a delayed repair on some models can run 1.5–2 million birr. "What if my car battery gets damaged because of the flood?" asked electric-taxi driver Natnael Admasu. "In some parts of the city, water can linger on the roads for half a day."

What's being done

The Addis Abeba Roads Authority says it addressed 75 of 145 identified flood-exposed sites in the 2025/26 fiscal year — new culverts near Lafto Hospital, repaired channels around German Square and Jemo, demolished illegal structures blocking waterways in Jemo 3, and new retaining walls and drainage cuts. Communications director Eyasu Solomon cited "differences in elevation, settlements crowded against rivers and waterways, and poor waste management" as the recurring causes.

Why it matters

A study like this turns "the floods are getting worse" from a feeling into a map — which matters, because 70 of the city's 145 known flood-exposed sites are still unaddressed even after this year's push. Whether that gap closes faster than the city keeps growing into flood-prone terrain is the real question the data raises. For now, it's still open — along with, as of this writing, Simon Nahom's disappearance.

Sources:

• Addis Fortune — "Addis Abeba Builds Over Its Waterways. Now the Floods Find a Way Back" (published 2026-08-15)

Editorial note: this piece touches an ongoing missing-person case (Simon Nahom, missing since 2026-07-22). Handle with care — do not speculate on his fate beyond what's reported, and check for any update on his status before publishing; if he has been found (alive or otherwise) by publication time, that needs to be reflected, not left as "still missing." Single-sourced from one Addis Fortune article — worth a second source on the casualty figures (2022, 2021 deaths) before publishing given their weight.