Calculation of RWH Tank Capacity for Different Climatic Zones in Sri Lanka

How to calculate the capacity Rain Water Harvesting Tank you need

  • Click on the nearest climatic zone (according to the city) to your location on the alphabetical list in the below section.
  • Read minimum daily service level you require from the relevant table, according to your roof size (area) and the tank size (capacity).

Reliability: 95%
Run off coefficient: 0.8

Tables are derived by Mansur’s Graphs: Mansur U. An Investigation on Rainwater Harvesting in Sri Lanka with Emphasis on Quality of Rainwater and System Design. M.Sc. Thesis University of Peradeniya, Peradeniya, Sri Lanka


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