How Much Water Costs Without a pool cover, a swimming pool in Cape Town can lose approximately 5mm of water per day due to evaporation in summer. This adds up to about 35mm per week and around 140mm (14cm) per month. Over a full year, this results in significant water loss, particularly during warmer months.
Estimated Water Loss Per Year by Pool Size
Assuming Cape Town’s climate, pools experience higher evaporation in summer (±6 months of the year) and moderate evaporation in winter. We will estimate based on a 50% loss rate in winter and 100% evaporation in summer:
- Small Pool (6m x 3m)
- Monthly summer evaporation: 2.52m³ (2,520L)
- Monthly winter evaporation: 1.26m³ (1,260L)
- Annual evaporation total: 22.68m³ (22,680L)
- Annual cost: R909.43
- Medium Pool (8m x 4m)
- Monthly summer evaporation: 4.48m³ (4,480L)
- Monthly winter evaporation: 2.24m³ (2,240L)
- Annual evaporation total: 40.32m³ (40,320L)
- Annual cost: R1,754.79
- Large Pool (10m x 5m)
- Monthly summer evaporation: 7m³ (7,000L)
- Monthly winter evaporation: 3.5m³ (3,500L)
- Annual evaporation total: 63m³ (63,000L)
- Annual cost: R3,016.41
Find out what the price of water per litre in South Africa works out to and the benefits of installing a borehole as well as borehole drilling prices in Cape Town here.
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