Zürich's Bachkonzept — Four Decades of Urban Stream Daylighting & Sewer Separation
Switzerland
Since 1988, Zürich's Bachkonzept has systematically separated clean rainwater from sewage and reopened culverted streams, daylighting about 20 of the …
Ethiopia · Addis Ababa · See the Ethiopia profile · See the Addis Ababa profile
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Addis Ababa's flagship plan targets 69 km of riverbanks with parks and stormwater ponds, but an independent review found most promised measures unbuilt, sewer outflows untreated, and resident participation minimal.
Launched in 2019, the Beautifying Sheger (Ye Sheger Šimagle) project is a City of Addis Ababa riverside-development programme covering an announced 69 km of the Sheger river system, running from the Entoto mountains through the city to the Akaki river, in an area home to over 1.3 million residents. Financing was coordinated through the African Development Bank's Urban and Municipal Development Fund, drawing on Italian, Chinese and Korean development-agency support and UN-Habitat.
Public and donor communications describe plans for cleaned and dredged riverbeds, new sewerage and drainage to replace direct waste discharge, stormwater retention ponds on tributaries to reduce peak flooding, and new parks and walkways along the watercourses, alongside livelihood alternatives for residents currently dependent on the rivers.
A critical review found the delivered scope fell well short of the concept: aside from concrete embankments, "the proposed ideas in the concept note...are not being implemented," with sewer and stormwater outlets still emptying directly into riverbeds rather than being diverted as planned. The original design was also replaced mid-project by a Chinese landscape architect's plan under an EPC contract structure that the review says reduced Ethiopian professionals to consultants and left "local input to a minimum," with no meaningful public-participation process in design or implementation.
Neither the promotional materials nor the critical review we found publish quantified before/after results (hectares greened, flood-days avoided, biodiversity counts); displacement of riverside residents and gardeners is acknowledged in principle but not quantified. We therefore treat this as a large, internationally financed but weakly evidenced and contested urban-greening programme, useful mainly as a documented cautionary case on the gap between announced river-greening scope and verified delivery.
Read the full analysis: https://www.wcscd.com/onlinejournal/the-danger-of-ambition-and-neglect-the-case-of-beautifying-sheger
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Switzerland
Since 1988, Zürich's Bachkonzept has systematically separated clean rainwater from sewage and reopened culverted streams, daylighting about 20 of the …
Vietnam
A World Bank-financed programme dredged 1.1 million tons of contaminated sediment from Ho Chi Minh City's 9 km Nhiêu Lộc–Thị …
Thailand
Launched in 2019 by the Bangkok Metropolitan Administration, Green Bangkok 2030 is converting underused public, state and private land into …
Japan
Since 2001, Tokyo has legally required new and renovated buildings above set size thresholds to green 20-25% of their roof …
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