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 …
Vietnam · Ho Chi Minh City · See the Vietnam profile · See the Ho Chi Minh City profile
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A World Bank-financed programme dredged 1.1 million tons of contaminated sediment from Ho Chi Minh City's 9 km Nhiêu Lộc–Thị Nghè canal, installed sewer interceptors and relocated over 7,000 households, turning a 'dead' black-water channel into a public waterfront.
By the 1990s, the Nhiêu Lộc–Thị Nghè canal running through five districts of Ho Chi Minh City had become a heavily polluted, sewage-choked waterway lined with informal housing, contributing to chronic urban flooding in surrounding neighbourhoods.
An initial phase of roughly US$120 million began in 1993, followed by a larger World Bank-financed project launched in 2002 (funded with over VND 8.6 trillion, about US$374 million) that dredged roughly 1.1 million tons of contaminated mud from the nearly 9 km canal, built sewer interceptors to stop raw wastewater discharge, and relocated more than 7,000 households (about 50,000 people) with compensation under World Bank resettlement-safeguard procedures.
The canal, once described locally as 'dead', now supports improved water flow, reduced flood risk in surrounding districts, and waterfront parks used for recreation, culture and waterway tourism; the city has continued the same model on other canals, including Tàu Hủ–Bến Nghé and, more recently, the Xuyên Tâm and Đôi canals.
Published sources document dredging volumes, project cost and resettlement scale in detail, but do not report independently measured water-quality indicators (e.g., BOD or dissolved oxygen) or biodiversity outcomes, so ecological recovery cannot be quantified from available evidence.
Read the full analysis: https://e.vnexpress.net/news/news/canal-revival-breathes-life-back-into-hcmc-4270518.html
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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 …
India
A ~12,500-hectare Ramsar wetland east of Kolkata has informally treated the city's sewage since the 1930s through ~254 fish ponds, …
Philippines
The Pasig River Rehabilitation Commission spent ₱52 million dredging and phytoremediating Manila's 2.3 km Estero de San Miguel with vetiver-planted …
Uganda
A papyrus wetland once filtered up to 99% of faecal coliforms from Kampala's wastewater before Lake Victoria, valued at US$1,500–2,900/ha/year …
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