How to present a rainfall data and methods to find the Average Rainfall

in this video i have explained How to present a rainfall data and their types of presentations such as rainfall mass curve, hetograph,depth area duration curve (DAD),intensity duration frequency curve(IDF),depth duration frequency curve(DDF). Also, i have explained methods to find the Average Rainfall data like Arithmetic increase method, Thesonpolygon method,orthographically weighted isohetal method.