2.11 Annual rainfall at a point M is needed. At five points surrounding the point M the values of recorded rainfall together with the coordinates of these stations with respect to a set of axes at point M are given below. Estimate the annual rainfall at point M by using the USNWS method. Rainfall Coordinates of station P (cm) (in units) Y Station X 2.0 102 1.0 120 126 108 131 B 2.0 2.0 1.0 D E 3.0 1.5 4.5 1.0 1.5 [Hint: In the US National Weather Service (USNWS) method, the weightage to the stations are inversely proportional to the square of the distance of the station from the station M. If the co-ordinate of any station is (x, y) then D² = x² + y° and weightage EPW w = 1/D². Then rainfall at M = P = EW m క్రికిషికిష