$2-$Rainfall over catchment area is $90$min duration. The rain gage distribution is shown in the figure;

the radius of the circle is $4km.1-$ Find the rain depth of the point $(x)$ which is in the center of the

circle $2-$ Average depth of rainfall over the area use the Best Method $3-$Accuracy frequency of the

Rainfall.

Prof. Dr$.$ Dana Khider Mawlood

Phd$.$ MSc$.$ Dipl.Ing from Vienna University of Technology $($Austria$)$