Clouds on tap

Abstract

WATER FOR THOUGHT T sh a n owa Junior Primary School in Limpopo is frequently shrouded in dense mist and rain, but the nearest water sources are a non-perennial spring located 2km away, and a dam, 5km away. Since most water sources in the province are contaminated, the ■ For fog collection to be effective, the site must be in an area where fog occurs frequently throughout the year, and lasts for a few hours at a time. The water content of the fog should be high,and the fog must be accompanied by wind to ensure that a large enough volume of moist air is blown through the collecting screens. ■ South African Weather Bureau records show that a number of places in South Africa have over 90 days of fog per annum. These are mostly located along the West Coast of southern Africa and in mountainous regions. ■ Rain clouds have the highest water content, followed by advection sea fog. Radiation fog has too little water to be successfully collected. ■ Ideally, sites should also be more than 1 000m above sea level.

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