NOVELTY - The green roof stormwater treatment system comprises a retention pond (310), an in-situ treatment unit (360) within the pond, and a sump pump (340). The pond is configured for storing a volume of stormwater and surface runoff stormwater. The in-situ treatment unit comprises: a sorption media of a filter, which the sorption media includes sawdust (25%), a tire crumb (15%), naturally occurring sands (50%) and limestone (10%) for testing; and entrance pipes (350) present in the retention pond for carrying the stormwater drawn by the sump pump into the filter for removing a nutrient.    USE - The green roof system is useful for treating stormwater in wet ponds and dry ponds for aquaculture operation including a shrimp farm and a fish farm, a forest clearance and geothermal inflows.    ADVANTAGE - The reusable and flexible green roof system treats the stormwater in an effective, economical and environmental friendly manner without particulates and contaminants thus providing highly qualified water.    DETAILED DESCRIPTION - The green roof stormwater treatment system comprises a retention pond (310), an in-situ treatment unit (360) within the pond, and a sump pump (340). The pond is configured for storing a volume of stormwater and surface runoff stormwater. The in-situ treatment unit comprises: a sorption media of a filter, which the sorption media includes sawdust (25%), a tire crumb (15%), naturally occurring sands (50%) and limestone (10%) for testing; entrance pipes (350) present in the retention pond for carrying the stormwater drawn by the sump pump into the filter for removing a nutrient from the stored stormwater; and a recirculation pipe (330) for discharging the filtered stored stormwater to the retention pond. The sump pump is connected with the in-situ treatment unit for withdrawing the stored stormwater form the pond to recirculate the stored stormwater through the in-situ treatment unit to sorb the nutrients from the stored stormwater.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic top view of a green roof system.    Pond (310)    Recirculation pipe (330)    Sump pump (340)    Entrance pipes (350)    In-situ treatment unit. (360)