Question

Thiesson method is better result than arithmetic mean method because _________

(a) It is shorter time consuming

(b) Gives better detail about records

(c) It is highly accurate

(d) Small procedure

I had been asked this question in exam.

This interesting question is from Rainfall and its Measurement topic in division Hydro Electric Power Plant of Energy Engineering

Answer 1

Correct choice is (c) It is highly accurate

Easy explanation: The mean rainfall of the basin  in thiesson method is given by:

  ha = \(\frac{h1A1 + h2A2 + h3A3 + h4A4 + h5A5  + h6A6 + h7A7 + h8A8}{A1+A2+A3+A4+A5+A6+A7+A8}\)

This method gives better result than arithmetic mean method because it is very accurate and each point on a perpendicular bisector of the line joining the two gauging stations will be equidistant from both the stations. If one moves slightly this or that side of the bisector, the position will distinctly fall in the domain of that station of which ones position is now near.