1.

(i) State the methods of determining average annual rainfallExplain any one method

Answer»

Average annual rainfallfor a place is generallycalculatedby averaging the last 30 years ofannual rainfall.Annual rainfallis the sum of dailyrainfall, that can becalculatedfrom raingauge records. Here, whilecalculating average annual rainfallone must take the length of period into account.

The formula for finding an average is easy to apply. The average equals the sum of all the items (in this case, rainfall measurements for a day, week, or month) divided by the number of items (however many days, weeks, or months you’ve added up)If you're looking for average weekly rainfall over 4 weeks, with recorded weekly rainfall totals of 20 inches, 12 inches, 6 inches, and 25 inches, we would say 20 + 12 + 6 + 25 = 63 (the sum of the items) / by 4 (the number of weeks) = 15.75 inches average weekly rainfall.



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