The reservoirs should be placed inside the containment basin, which should have at least 50% of the reservoir maximum capacity, and should be placed on an adequately covered area. In case of more than one reservoir, the containment basin should have 110% of Storage capacity of the biggest reservoir or 25% of the total capacity of the reservoirs located inside the basin, which is bigger. Alternatively, the reservoirs can have double walls and be equipped with a leak detector.
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