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Zachytávání dešťové vody

Rainwater Harvesting Calculator

Roof Area (m²)
Annual Rainfall (mm)
Účinnost

What is Rainwater Harvesting?

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Zachycování dešťové vody shromažďuje střešní déšť pro zavlažování zahrady, splachování záchodů nebo jiné nepitné účely. Účinnost sběru je obvykle 80–90 %, což odpovídá ztrátám.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Vzorec

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f(x)Sklizený objem (L) = plocha (m²) × srážky (mm) × účinnost (typicky 0,85)

How to Rainwater Harvesting

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  1. 1Harvestable volume (L) = Area (m²) × Rainfall (mm) × Efficiency
  2. 2Efficiency 85% is typical for clean roof with gutters
  3. 3Annual harvest varies greatly by location
  4. 4Tank sized to hold 2–4 weeks of typical use

Worked Examples

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Example 1
Given:80m² roof, 700mm annual rainfall, 85% efficiency
Výsledek:Annual harvest = 80 × 0.7 × 0.85 × 1,000 = 47,600 litres

UK Annual Rainfall

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CityAnnual rainfallHarvest (80m², 85%)
Cardiff1,152mm~78,300 L
London601mm~40,900 L
Manchester804mm~54,700 L
Edinburgh680mm~46,200 L

Frequently Asked Questions

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Q

What is Rain Harvest?

A

Rainwater harvesting collects rooftop rain for garden irrigation, toilet flushing, or other non-potable uses. Collection efficiency is typically 80–90% accounting for losses

Q

How accurate is the Rain Harvest calculator?

A

The calculator uses the standard published formula for rain harvest. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

Q

What units does the Rain Harvest calculator use?

A

This calculator works with inches, square metres, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

Q

What formula does the Rain Harvest calculator use?

A

The core formula is: Harvestable volume (L) = Area (m²) × Rainfall (mm) × Efficiency. Each step in the calculation is shown so you can verify the result manually.

Formula-verified for precision
Reviewed October 2026
Our methodology

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