The urban water metabolism of Cape Town: Towards becoming a water sensitive city

نویسندگان

چکیده

To improve its resilience to increasing climatic uncertainty, the City of Cape Town (the City) aims become a water sensitive city by 2040. undertake this challenge, means measure progress is needed that quantifies urban systems at scale enables whole-of-system approach management. Using an metabolism framework, we (1) provide first city-scale quantification cycle integrating natural and anthropogenic flows, (2) assess alternative sources (indicated in New Water Programme) whether they support towards becoming sensitive. We employ spatially explicit method with particular consideration apply analysis other African or Global South cities. At time study, centralised potable demand amounted 325 gigalitres per annum, 99% which was supplied externally from surface storage, remaining ~1% internally groundwater storage (Atlantis aquifer). Within City’s boundary, runoff, wastewater effluent represent significant internal resources could, theory, supply efficiency internalisation as well hydrological performance. For practical use throughout landscape, insight required regarding seasonality local capacity quality it conveyed through complex landscape. suggest further research develop metrics equity, both are important context.
 Significance:
 
 This provides initial groundwork quantifying magnitude annual timescale, relation city. The framework used study dynamics benchmark By flows into out system, sheds light on opportunities circularity cycle. spatial adopted here platform interrogate landscape role using data products available via national sets remote sensing, can be applied where characteristically scarce. Further work establish adequately describe equity.

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ژورنال

عنوان ژورنال: South African Journal of Science

سال: 2021

ISSN: ['0038-2353', '1996-7489']

DOI: https://doi.org/10.17159/sajs.2021/8630