In South Africa, the average water consumption per person in an established household is around 200 to 250 liters per day. This amount includes water used for drinking, cooking, bathing, cleaning, and other daily activities. Water usage can vary depending on lifestyle, climate, and household size, but this figure provides a good baseline for calculating how much water a household might need in the event of a municipal water supply interruption.
In South Africa, water supply interruptions due to high usage, maintenance, or infrastructure challenges are not uncommon. Whether you live in an area that faces water restrictions or you’re preparing for unexpected supply interruptions, having a backup water storage system is essential for ensuring your household remains functional during such times. But how much water should you store to meet your family’s needs?
Let’s break down the factors to consider and provide a practical guide to help you plan for water storage.
1. Understanding Daily Water Needs
As mentioned, the average person in South Africa uses about 200 to 250 liters of water per day. This usage is divided between:
- Drinking and Cooking: About 3–5 liters per person per day.
- Personal Hygiene (Bathing, Handwashing): 50–70 liters per person per day.
- Toilets: 15–30 liters per flush (depending on the toilet).
- Laundry and Dishwashing: 15–50 liters per use.
- Gardening and Outdoor Use: This can vary greatly depending on the size of the garden or application, but during times of water restrictions, outdoor use should be minimized.
For emergency planning, it’s recommended to focus on essential water needs, such as drinking, cooking, personal hygiene, and toilets.
2. Determining the Duration of Municipal Water Storage
To determine how much water to store, it’s essential to assess how long an interruption might last. In some cases, water shortages could last a few hours, while in more severe situations, interruptions could extend over days or even weeks. Consider the following:
- Short-Term Interruption (1-3 days): Store enough water for 3 days of essential needs. For a family of four, this would mean a minimum of 2700 liters.
- Medium-Term Interruption (1 week): In more serious cases where repairs or unforeseen interruptions could extend for a week, plan to store at least 700-1,000 liters for a family of four.
- Long-Term Interruption (2 weeks or more): For extended disruptions, you may want to install larger water tanks capable of holding 2,000 liters or more to ensure your household remains adequately supplied.
4. Sizing Your Water Tank Based on Household Needs
Given the average consumption rates in South Africa, here’s a guide to choosing the right water tank size based on different household sizes and anticipated duration of water supply interruptions:
- For a Family of 2 (Short-Term Storage):
- Minimum storage for 3 days: 160–200 liters.
- Ideal tank size: A 1000-liter tank would provide a comfortable buffer.
- For a Family of 4 (Short-Term Storage):
- Minimum storage for 3 days: 2000 liters.
- Ideal tank size: A 2500-liter tank would cover most emergencies.
- For a Family of 4 (Medium to Long-Term Storage):
- Minimum storage for 7 days: 2500-3000 liters.
- Ideal tank size: A 5,000-liter tank would provide sufficient water for a week or more of basic use.
5. Considerations for Larger Households or Extended Use
Larger families or households that expect longer disruptions should consider installing water tanks with capacities of 3,000 liters or more. These larger tanks can also serve as a backup for non-potable uses like gardening or washing, allowing you to reserve the cleanest water for drinking and hygiene.
6. Supplementing Your Storage with Rainwater Harvesting
Rainwater harvesting systems can significantly augment your water storage capacity. By installing gutters and filters to collect rainwater from your roof, you can store this water for non-potable uses such as gardening or flushing toilets, which helps conserve your potable water supply. This is especially helpful in regions of South Africa that experience seasonal rains.
7. Maintaining Water Quality
It’s important to maintain the quality of stored water, especially for drinking and cooking. Here are some tips:
- Use food-grade tanks to prevent chemical contamination.
- Cover your tanks to avoid contamination from debris, insects, or animals.
- Add water treatment solutions like chlorine or water purification tablets to keep stored water safe for longer periods.
Conclusion
In South Africa, planning for water supply interruptions is a necessary precaution. Depending on your household size and the expected duration of the disruption, a water storage system of 500 liters to 3,000 liters will help ensure that your family has enough water for essential needs. By considering your daily usage, preparing for the worst-case scenario, and maintaining your water storage system, you can be confident in your ability to weather municipal water interruptions with minimal impact on your household.