South Africa
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Crunching the numbers
Posted by MPHEHPHETHA PS, South Africa on 26 November 2018
Post related to Water Butt Challenge,

Today Jojo tank challenge was all about calculating the rain water that we could potentially harvest off our roofs. A certainly challenging challenge. Our Grade 6 learners found the Maths tough measuring the school building roof surface area and then multiplying the length x width by the height of the rain that falls on the roof throughout the year in meters. We needed to go over the basics 1 meter=100cm=1000mm to make sure we work with the same values in meters. Once we had done the calculations we discovered that potentially we could harvest a staggering 667 000 litres of water off 2 building in 1 year of an average rainfall of 800mm per year. Now that is impressive!!




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