{"query_echo":{"q":"","filters":{"analysis_type":["climate change scenario analysis"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'climate change scenario analysis' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":1,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=climate+change+scenario+analysis","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"iisd-002035","url":"https://climateinsightsdirectory.org/document/iisd-002035","title":"Sustainable Asset Valuation (SAVi) of Stormwater Infrastructure Solutions in Johannesburg, South Africa","publisher":{"name":"International Institute for Sustainable Development","organization":"international-institute-for-sustainable-development"},"document_type":"report","language":"en","date_published":"2021-04","source_url":"https://www.iisd.org/system/files/2021-04/savi-stormwater-johnannesburg-south-africa.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The assessment finds that nature-based infrastructure (stream renaturalization) is the most cost-efficient and climate-resilient option, providing the highest net benefits primarily through avoided flood damages and additional water supply. While grey infrastructure (concrete culverts) has the highest upfront costs and provides no environmental co-benefits, nature-based solutions maintain superior performance across various climate scenarios, although they are more labour-intensive to maintain.","ai_generated":true,"unit":"iisd-002035#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"Nature-based infrastructure (stream renaturalization) is the most cost-efficient investment over the infrastructure life cycle, requiring the lowest upfront capital costs compared to grey and hybrid options, although it incurs higher annual operation and maintenance costs.","ai_generated":true,"unit":"iisd-002035#insight-1","date_modified":"2026-10-23"},{"text":"Avoided flood damages represent the largest monetary benefit for nature-based solutions. Full stream renaturalization avoids approximately ZAR 103 million in flood damage costs over 20 years and over ZAR 184 million over 40 years, while the hybrid solution avoids ZAR 87 million and ZAR 168 million over the same periods, respectively.","ai_generated":true,"unit":"iisd-002035#insight-2","date_modified":"2026-10-23"},{"text":"Nature-based solutions provide significant additional water supply through increased soil permeability and groundwater recharge. Over 40 years, the renaturalized stream generates an estimated economic benefit of ZAR 55.52 million from additional water supply, which alone outweighs the total project costs by approximately ZAR 3.4 million.","ai_generated":true,"unit":"iisd-002035#insight-3","date_modified":"2026-10-23"},{"text":"Under various climate change scenarios, nature-based infrastructure (NBI) demonstrates greater resilience than grey solutions. The benefits of NBI increase as precipitation patterns become more volatile, whereas the capacity of grey stormwater solutions is limited by design, making them less equipped for extreme weather events.","ai_generated":true,"unit":"iisd-002035#insight-4","date_modified":"2026-10-23"},{"text":"The RCP 6.0 climate scenario results in the poorest performance for all infrastructure options due to a higher frequency of extreme rainfall events. In this scenario, the hybrid and fully renaturalized solutions provide the same amount of avoided flood damage costs (ZAR 43.2 million) over a 20-year horizon, indicating that severe events can cause damages regardless of the NBI type implemented.","ai_generated":true,"unit":"iisd-002035#insight-5","date_modified":"2026-10-23"},{"text":"Grey stormwater infrastructure (concrete culverts) yields negative net results over both 20- and 40-year horizons (approximately ZAR -85 million) because it requires high capital expenditure without delivering environmental, social, or economic co-benefits, except for minimal income generation from maintenance.","ai_generated":true,"unit":"iisd-002035#insight-6","date_modified":"2026-10-23"},{"text":"Nature-based solutions generate additional socio-economic co-benefits, including increased property values in the Orange Grove, Norwood, and Orchard districts, higher property tax revenues for the city, and income creation through labour-intensive maintenance work.","ai_generated":true,"unit":"iisd-002035#insight-7","date_modified":"2026-10-23"}],"climate_tags":["climate change adaptation","climate resilience","Flood mitigation","groundwater recharge","carbon sequestration","urban heat island"],"geography_discussed":["Orange Grove","Norwood","Orchard","Gauteng","South Africa"],"frame_perspective":[],"analysis_type":["integrated cost-benefit analysis","climate change scenario analysis","system dynamics simulation"]}]}