Transparent emergency demand management: dashboards, escalating tariffs, pressure management and a communicated deadline
#00182
Cut urban water demand fast during a supply crisis by combining real-time public dashboards, escalating restriction levels and block tariffs, network pressure management, flow restrictors, and a communicated deadline—with the burden visible and uniform across the city.
Parent issue
#00173 Cities in drying climates face recurring Day Zero drinking-water shortfalls
Sustainable Development Goals
Location
city
Description
Mechanism
This is the Cape Town Day Zero playbook: treat transparency itself as a demand-management technology. The core components work together:
- Real-time public data. A daily or weekly dashboard showing reservoir levels, current demand and the projected shortfall date. Residents can verify the crisis is real and see collective progress.
- Escalating restriction levels. A pre-published ladder of stages (watering bans, per-person daily caps) tied to objective reservoir triggers, so tightening feels rule-based rather than arbitrary.
- Escalating block tariffs. Steeply rising prices per unit as household use climbs, making high consumption expensive while keeping a basic allowance affordable.
- Network pressure management. Reducing distribution pressure cuts leakage and passive consumption without requiring behavior change. In Cape Town this alone saved roughly 10 percent of demand.
- Flow restrictors on the connections of persistent over-users.
- A vivid deadline. Naming the day the taps run dry (
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Case studies
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