Why could the culvert system not handle large volumes during sudden rain?

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Culvert System Capacity Exceeded Due to Unprecedented Rainfall Intensity

The culvert system in Precinct 11, Putrajaya, was unable to accommodate the large volume of water flow during the recent flash flood due to the sheer intensity of the rainfall, which significantly surpassed the system's designed capacity. This unprecedented event, described as three times the usual rainfall recorded for the area, overwhelmed the existing infrastructure. The problem was compounded by upstream heavy rain and rising waters from Sungai Anak Gajah, which led to a blockage in water flow as the lower areas overflowed.
Rainfall Intensity Surpassed Design Capacity

The flash flood in Precinct 11 occurred because the sudden, heavy rainfall exceeded the capacity of the existing culvert system. This system, designed for typical water flow in the residential area, found itself unable to manage the significantly larger volume generated by the extreme weather event. Reports indicated that the rainfall was three times the usual amount recorded, a level that appears to have gone beyond the system's engineering parameters for water management.
Upstream Factors and Blocked Water Flow

Contributing to the inundation was the impact of heavy rain upstream and the subsequent rise of water levels in Sungai Anak Gajah. This confluence of factors caused the water flow to become blocked in the lower-lying areas of the residential precinct. As the water rose and could not be effectively channelled away by the culverts, it began to overflow, leading to the submersion of vehicles and properties.
General Limitations of Culvert Systems

Generally, culvert systems are engineered to manage specific volumes of water based on historical rainfall data and anticipated runoff. While designed to be robust, they have inherent capacity limitations. In scenarios of extreme weather events, such as sudden downpours with significantly higher rainfall intensity than anticipated, these systems can become overwhelmed. This can lead to water backing up and overflowing, a common challenge when the volume of incoming water exceeds the rate at which it can be discharged through the installed conduits.

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Why could the culvert system not handle large volumes during sudden rain?

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