流域平均雨量:又叫面雨量。水文工作中常需推求整个流域面上的平均降雨量。最常用的方法是算术平均法和垂直平分法(又叫做泰森多边形法),也有用绘制等雨量线图来推求的。 Average catchment rainfall: also known as surface rainfall. Hydrological work often requires deriving average rainfall over the entire catchment. The most commonly used methods are arithmetic averaging and vertical bisecting (also known as Thiessen polygons), as well as drawing rainfall maps.