HOW MUCH BOTSWANA IS LOSING WITHOUT WATER HARVESTING 🌍

 

Key Reality

Botswana receives rain, but:

• Very little is harvested
• Most is:
  • Lost as runoff
  • Evaporated due to high temperatures
  • Not stored at household or farm level

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Quantifying the Loss (Strategic Estimate)

Let’s break it down:

1. Rainfall Volume Potential

• Botswana land area ≈ 581,000 km²
• Rainfall ≈ 416 mm/year

 Total rainfall volume:

• ≈ 241 billion cubic meters annually

Even if only 5% is harvestable, that is:

• ≈ 12 billion cubic meters

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2. Compare with Current Water Use

• Botswana heavily depends on:
  • Dams
  • Groundwater (≈ 49% of supply)

Yet:

• Only a tiny fraction of rainfall is captured

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3. Economic Loss from Non-Harvesting

Let’s convert to money:

If:

• 1 m³ water ≈ P10 (average domestic value)

Then:

• 12 billion m³ potential = P120 billion worth of water annually

Even if we reduce this to realistic capture:

• 1% utilization = P24 billion
• 0.5% utilization = P12 billion

Conservative Conclusion

Botswana is likely losing:
P10 billion – P100+ billion annually in unrealized water value