水稻灌溉用水量是水利化区划、水库调节计算以及灌区规划设计和管理的重要数据之一,因此如何正确、迅速拟定水稻灌溉用水量,是当前生产上急需解决的重要课题。过去我们经常采用水稻生育降雨量系列频率法(下称“降雨频率法”),选择典型年设计水稻灌溉制度。降雨频率法认为水稻灌溉用水量和生育期降雨量有密切的相关关系,用此法在计算某一保证率的用水量时,总是选取水稻生育期降雨频率接 The amount of irrigation water for rice is one of the important data for water area division, reservoir regulation calculation and planning design and management of irrigation district. Therefore, how to formulate the irrigation water amount correctly and rapidly is an important issue urgently needed to be solved in current production. In the past, we often used a series of rainfall-yielding rice frequency methods (hereinafter referred to as “rainfall frequency method”) to select the typical design of rice irrigation system. According to the rainfall frequency method, it is considered that there is a close correlation between irrigation water consumption and rainfall during the growth period. When this method is used to calculate the water consumption of a certain guarantee rate, the rainfall frequency of rice growth period