NYC Plaza Program — Times Square and Broadway Street-to-Plaza Conversions (2009–)
United States of America
NYC DOT turned Broadway road space into interim plazas with paint and furniture from 2009, then made them permanent after …
Kenya · Nairobi · See the Kenya profile · See the Nairobi profile
Evidence: Observational / pre–post Top 3% 91/100 · Ask Evidence Copilot about this practice
Since 2006, Kounkuey Design Initiative has co-designed 11 flood-resilient public spaces with Kibera residents on reclaimed dumpsites, installing 520m of flood protection and 840m of drainage, and reaching over 125,000 of the settlement's residents.
Kibera, Nairobi's largest informal settlement, is home to an estimated 300,000+ residents and has historically lacked formal public infrastructure; flooding, poor drainage and informal dumping sites have created recurring public-health and safety hazards.
Kounkuey Design Initiative (KDI), a non-profit founded through a 2006 partnership with the New Nairobi Dam Community Group, developed a 'productive public space' model: reclaiming polluted or dumped-on land through community-led design, construction and long-term co-management, combining flood-mitigation infrastructure with civic and income-generating uses, without displacing existing housing.
Government recognition has grown progressively: a 2016 memorandum of understanding with Nairobi County's Department of Public Works, a 2018 partnership with the Kenya Meteorological Department, and 2020 approval of the Kibera Special Planning Area by Nairobi Metropolitan Services.
Per the WRI Ross Center for Sustainable Cities' 2020-2021 Prize for Cities evaluation, the network comprised 11 public spaces - 35% of all purpose-built public space in Kibera - including 520 metres of flood protection and 840 metres of drainage infrastructure. The network reaches over 125,000 residents through improved service access and flood protection, with roughly 10,000 people per day using it, and more than 5,000 residents were directly involved in design processes.
KDI's approach was later adapted for Kenya's Kalobeyei refugee settlement, indicating cross-context transferability. Publicly available cost data and rigorous counterfactual impact evaluations remain limited, which this entry records honestly rather than overstating the evidence base.
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United States of America
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