precipitation observation meaning in English

降水观测
降水量观测

Based on the daily and hourly precipitation observation and daily soil moisture observation in meishan , nianyushan and jiangji station in shiguanhe river catchment over the huaihe river basin in summer of 1998 and 1999 , the temporal variations of the precipitation and soil moisture of this three stations and their relationship are analyzed in this study
本文首先利用1998 、 1999年淮河地区史灌河流域夏季逐日降水资料，逐小时降水资料和梅山、鲇鱼山、蒋集站的土壤湿度观测资料，对三个站的土壤湿度和降水随时间的变化趋势及它们之间的相互关系进行分析。