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Consistency
1. A. The annual rainfall at station X and the average annual rainfall at 18 surrounding
stations are given below. Check the consistency of the record at station X and determine
the year in which a change in regime has occurred. State how you are going to adjust the
records for the change in regime. Determine the average annual rainfall for the period
1952-1970 for the changed regime.
B. In a certain river basin there are six rain-gauge stations, the normal annual rainfall
depths at the stations being 42.4, 53.6, 67.8, 78.5, 82.7 and 95.5 cm, respectively.
Determine the optimum number of rain-gauge stations to be established in the basin if it
is desired to limit the error in the mean value of rainfall over the catchments to 10% and
indicate how you distribute them.