The relationship between peak specific discharge and watershed area is examined for large, rare and extreme floods in Malaysia using a distributed hydrological model. Envelope curves for specific discharge for these events and the uncertainty is quantified. The relationships between rainfall duration and intensity as a function of watershed size were also examined. As a result, three main regions were defined to estimate the peak discharge as a function of watershed size for large, extreme and rare floods. The average magnitudes for the PMP and the world’s extreme rainfall events were 5 and 12 times larger than the 100-year event, respectively. The envelope curves may assist engineers and other interested parties to estimate the peak discharge for watershed up to 100,000 km², especially for ungauged watersheds.

使用分布式水文模型研究了马来西亚的大洪水，罕见洪水和极端洪水的峰值比流量与流域面积之间的关系。针对这些事件的特定放电的包络曲线和不确定性进行了量化。还检查了降雨持续时间和强度之间的关系，作为流域规模的函数。结果，定义了三个主要区域，以估计在大洪水，极端洪水和罕见洪水中，峰值流量与流域大小的关系。PMP和世界极端降雨事件的平均强度分别是100年事件的5倍和12倍。包络线可以帮助工程师和其他有关方面估算最大100,000 km ^2的流域的峰值流量，尤其是对于未开放的分水岭。