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Operational requirement: The natural watershed must not receive the waters of the longitudinal network whatever the conditions of rainfall, up to centenale
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Object
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attributs
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dimensionnality
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representation
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pipe and other elements of longitudinal drainage system
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Membership system
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Topological synoptic with connections to retention ponds
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retention pond
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Name, number
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Topological synoptic
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Organic requirement: The longitudinal drainage network must consist of a pipe that allows flow Q25
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Object
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attributs
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dimensionnality
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representation
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pipe
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diameter
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3D object to design diameter and tilt
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retention pond
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Name, number, volume, type
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2 or 3D representation to design volume, type and operation
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