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Fountain rule All fountains should obey a fountain rule, that fountain rule is called the jw rule The J.W rule states that the height of water emanating from a fountain / water feature should be no more than 50% of the diameter of the pool in which it sits. This is because water will fall / blown as far as it is high. So for example if you have a pool that is 4 M* across if you have a jet that is 4M* high in this pool that means water can fall 2 m outside of the pool. Obviously over time this will empty the pool. this applies to ANY pool. There are certain "Exceptions" such as if you have a large surface, such as a rock or wall where the water runs down its surface, or wind controls to reduce jet height in high winds, auto fill to compensate for water loss. When designing a fountain or adding a fountain to your pond / pool this rule must be taken into consideration
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