the skill and education levels of the practitioner / designerīelow we will outline 3 different methods for sizing RWH system components.the availability of the tools required for using a particular method (e.g.the size and sophistication of the system and its components.The choice of method used to design system components will depend largely on the following factors: Some are readily carried out by relatively inexperienced first-time practitioners others require computer software and trained engineers who understand how to use this software. These methods vary in complexity and sophistication. There are a number of different methods for sizing system components. The style of rainwater harvesting will also play a part in determining the system components and their size. runoff coefficient (this varies between 0.5 and 0.9 depending on roof material and slope).local rainfall data and weather patterns.The storage requirement will be determined by a number of interrelated factors. Usually, the main calculation when designing a DRWH system will be to size the water tank correctly to give adequate storage capacity.
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