As an AI language model, I do not have information about the specific size and location of the building. However, in general, the water drainage requirements for a building depend on various factors such as the size of the roof, slope of the ground, soil type, location, rainfall patterns, and local building codes. The building may require a combination of stormwater management practices such as gutters, downspouts, drainage pipes, swales, retention ponds, or infiltration trenches to manage water runoff and prevent flooding. The design should take into account the projected flow rates, volume, and concentration of the water runoff. It is recommended that a qualified engineer or a local authority be consulted for specific drainage requirements for a particular building.
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