The collection of rainwater can provide clean water by using renewable solar energy. The parameters involved in the design of a rainwater collection system are explained and related by means of a Design Curve. A method of developing this curve is presented and it is shown that its storage estimates have a reliability between 99 and 100 Oer cent. Practical use of the Design Curve is briefly described. R6sum6 La collecte de l'eau de pluie peut approvisioner en eau potable, utilisant l'6nergie renouvelable du soleil. Les paramdtres utilis6s en conEevant le systdme de collecte de la pluie sont expliques et d6montr6s par une courbe de dessein. Une methode de dtiriver cette courbe est pr6sentee et les estimations de stockage pour une fiabilite de 99 et 100 pourcent sont donn6es. L'utilisation pratique de cette courbe de dessein est d6crite.
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